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  • 1.
    Andersson, P
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    On Dynamic Dislocations at Crack Growth1995Licentiate thesis, monograph (Other scientific)
  • 2.
    Axen, N
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Abrasive wear in intermediate mode of multiphase materials1995In: TRIBOLOGY INTERNATIONAL, ISSN 0301-679X, Vol. 28, no 8, p. 523-529Article in journal (Refereed)
    Abstract [en]

    This article introduces the concept and a model of wear in intermediate (I) mode. Intermediate mode wear proceeds between two wear modes which correspond to upper and lower limits for the wear resistance which can be expected for a multiphase material. Th

  • 3.
    Beccu, R
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Wu, CM
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Reflection and transmission of the energy of transient elastic extensional waves in a bent bar1996In: JOURNAL OF SOUND AND VIBRATION, ISSN 0022-460X, Vol. 191, no 2, p. 261-272Article in journal (Refereed)
    Abstract [en]

    Reflection and transmission of the energy of a transient elastic extensional wave at a sharp or smooth bend of a bar are studied theoretically and experimentally, with the principal aim being to validate the model used by Wu and Lundberg in a parallel stu

  • 4.
    Berzi, P
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Beccu, R
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Identification of a percussive drill rod joint from its response to stress wave loading1996In: INTERNATIONAL JOURNAL OF IMPACT ENGINEERING, ISSN 0734-743X, Vol. 18, no 3, p. 281-290Article in journal (Refereed)
    Abstract [en]

    In percussive drilling of rock, elastic stress waves are generated in a drill string through repeated axial impacts by the hammer of a rock drill. For holes deeper than a few meters, several drill rods are commonly joined by means of cylindrical coupling

  • 5. Bussac, Marie-Noёl
    et al.
    Collet, Pierre
    Gary, G.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Mousavi, S.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Viscoelastic impact between a cylindrical striker and a long cylindrical bar2008In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 35, no 4, p. 226-239Article in journal (Refereed)
    Abstract [en]

    Axial impact between a cylindrical striker of finite length and a long cylindrical bar, both of linearly viscoelastic materials, is considered. General results are derived for the impact force, the particle velocity and the strain in the bar in terms of closed-contour integrals. Such results are derived also for the transfer of momentum and energy from the striker to the bar. Numerical results for a striker and a bar made of the same material but with different cross-sectional areas are compared. In viscoelastic impact, unlike elastic impact, the duration of contact may be finite and larger than two transit times for a wave front through the striker due to the formation of a tail of finite length after the main pulse. Furthermore, multiple contacts and separations of the striker and the bar may occur within a range of striker-to-bar characteristic impedance ratios. In the case of viscoelastic impact studied numerically, the duration of contact is at least as long and the momentum and energy transferred are at most as large as in elastic impact. Strains measured at three locations of a polymethyl methacrylate (PMMA) bar impacted by strikers of the same material as the bar agree well with the theoretical results.

  • 6.
    Ekevad, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    On the Mechanics of Pole Vaulting1995Licentiate thesis, monograph (Other scientific)
  • 7.
    Ekevad, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Influence of pole length and stiffness on the energy conversion in pole-vaulting1997In: JOURNAL OF BIOMECHANICS, ISSN 0021-9290, Vol. 30, no 3, p. 259-264Article in journal (Refereed)
    Abstract [en]

    An impact process similar to pole-vaulting is studied, viz., the impact in a vertical plane between the bottom end of a slightly curved elastic bar (pole), with a point mass'(vaulter) at the top end, and a rigid support (pole box). Before impact, the velo

  • 8.
    EKEVAD, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    LUNDBERG, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    SIMULATION OF SMART POLE VAULTING1995In: JOURNAL OF BIOMECHANICS, ISSN 0021-9290, Vol. 28, no 9, p. 1079-1090Article in journal (Refereed)
    Abstract [en]

    The process of pole vaulting is simulated using a finite element two-dimensional model of the pole and the vaulter. The pole is modelled with 20 beam elements and the vaulter with seven such elements linked together by pin joints. 'Smart' behaviour is ach

  • 9.
    Gunnars, J
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    On Cracks in Layered Materials1995Licentiate thesis, monograph (Other scientific)
  • 10.
    Hillstrom, L
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Mathematics and Computer Science, Department of Information Technology, Automatic control. Hållfasthetslära.
    Mossberg, M
    Department of Engineering Sciences, Solid Mecanics. Mathematics and Computer Science, Department of Information Technology, Automatic control. AUTOMATIC CONTROL.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Mathematics and Computer Science, Department of Information Technology, Automatic control. Hållfasthetslära.
    Identification of complex modulus from measured strains on an axially impacted bar using least squares2000In: JOURNAL OF SOUND AND VIBRATION, ISSN 0022-460X, Vol. 230, no 3, p. 689-707Article in journal (Refereed)
    Abstract [en]

    The complex modulus of a material with linearly viscoelastic behaviour is identified on the basis of strains which are known, from measurements and sometimes from a free end boundary condition, at three or more sections of an axially impacted bar specimen

  • 11.
    Hillström, L
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Analysis of elastic flexural waves in non-uniform beams from measurement of strains or accelerations2001In: Journal of Sound and Vibration, Vol. 247, no 2, p. 227-242Article in journal (Refereed)
  • 12.
    Hillström, L
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Valdek, U
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Estimation of the state vector and identification of the complex modulus of a beam2003In: Journal of Sound and Vibration, Vol. 261, p. 653-673Article in journal (Refereed)
  • 13.
    Holmgren, S E
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Mechanical testing of wood under conditions relevant for mechanical pulping2007Licentiate thesis, monograph (Other scientific)
  • 14. Holmgren, S. -E.
    et al.
    Svensson, B. A.
    Gradin, P. A.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    An encapsulated split Hopkinson pressure bar for testing of wood at elevated strain rate, temperature, and pressure2008In: Experimental techniques (Westport, Conn.), ISSN 0732-8818, E-ISSN 1747-1567, Vol. 32, no 5, p. 44-50Article in journal (Refereed)
  • 15.
    Itskovits, MA
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Generalization of the Achenbach-Chao model for waves in non-linear hereditary media1996In: INTERNATIONAL JOURNAL OF NON-LINEAR MECHANICS, ISSN 0020-7462, Vol. 31, no 2, p. 203-210Article in journal (Other scientific)
    Abstract [en]

    An analogue of the Achenbach-Chao model for the case of wave propagation in non-linear hereditary elastic media is considered.

  • 16.
    Jansson, Anders
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
    Valdek, Urmas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Generation of prescribed strain waves in an elastic bar by use of piezoelectric actuators driven by a linear power amplifier2007In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 306, no 3-5, p. 751-765Article in journal (Refereed)
    Abstract [en]

    The problem of generating prescribed strain waves in an elastic bar by means of a pair of piezoelectric actuators driven in phase by a linear power amplifier was considered theoretically and experimentally. The power amplifier was characterized by its DC voltage gain and 3 dB cut-off frequency unloaded, and by its output resistance and inductance. With the assumption of one-dimensional (1D) wave propagation in the bar, including the actuator region, a linear difference equation was derived for the required input voltage to the power amplifier in terms of the strain associated with the prescribed wave. This difference equation was solved numerically for a bell-shaped strain wave and for a single-period sine strain wave. After identification of the linear power amplifier, two tests were carried out with the aim to generate the two strain waves in an aluminium bar instrumented with semi-conductor strain gauges. Very good agreement was obtained between the implemented and required input voltages, output voltages and output currents of the power amplifier, and good agreement was achieved between the implemented and prescribed strain waves.

  • 17.
    Lidén, E
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Interaction of long rod projectiles and thin oblique moving plates2006Licentiate thesis, monograph (Other scientific)
  • 18.
    Lidén, Ewa
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mecanics.
    Johansson, B
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mecanics.
    Effect of thin oblique moving plates on long rod projectiles: a reverse impact study2006In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 32, no 10, p. 1696-1720Article in journal (Refereed)
    Abstract [en]

    The geometry and motion of long rod projectiles after penetrating thin obliquely oriented and moving armour plates were studied. Plates moving in their normal directions towards as well as away from the projectile (scalar product of velocities negative and positive, respectively) were considered. The influences of plate velocity and obliquity (angle between the normal of the plate and the axis of the projectile) were investigated through small-scale reverse impact tests with tungsten projectiles of length 30 mm and diameter 2 mm, and with 2 mm-thick steel plates. The obliquity (30°, 60° and 70°) and the plate velocity (300 to −300 m/s) were varied systematically for a projectile velocity of 2000 m/s. The disturbing effect of the plate on the projectile was characterised in terms of changes in length, velocity, angular momentum, linear momentum and kinetic energy. Plates with obliquity 60–70° moving away from the projectiles with velocity 200–300 m/s were found to cause extensive fragmentation of the projectile and to have large disturbing effects in terms of all measures used.

  • 19.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Computer Modelling and Simulation of Percussive Drilling of Rock1993Book (Other scientific)
  • 20.
    Lundberg, B
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Okrouhlik, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Approximate transmission-equivalence of elastic bar transitions under 3D conditions2002In: Journal of Sound and Vibration, Vol. 256, no 5, p. 941-954Article in journal (Refereed)
  • 21.
    Lundberg, B
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Okrouhlik, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Influence of 3D effects on the efficiency of percussive rock drilling2001In: Int. J. Impact Engng, Vol. 25, p. 345-360Article in journal (Refereed)
  • 22.
    Lundberg, B
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Ödeen, S
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    In situ determination of the complex modulus from strain measurements on an impacted structure1993In: Journal of Sound and Vibration, Vol. 167, p. 413-419Article in journal (Refereed)
  • 23.
    Lundberg, Bengt
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics. Hållfasthetslära.
    Okrouhlik, M
    Efficiency of a percussive rock drilling process with consideration of wave energy radiation into the rock2006In: Int. J. Impact Engng, Vol. 32, p. 1573-1583Article in journal (Refereed)
  • 24.
    Lundberg, P
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Interface Defeat and Penetration: Interaction between Metallic Projectiles and Ceramic Targets2001Licentiate thesis, monograph (Other scientific)
  • 25.
    Lundberg, Patrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Transition between interface defeat and penetration for tungsten projectiles and four silicon carbide materials2005In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 31, no 7, p. 781-792Article in journal (Refereed)
    Abstract [en]

    Armour systems containing high-quality ceramics may be capable of defeating armour-piercing projectiles on the surfaces of these hard materials. This capability, named interface defeat, has been studied for four different silicon carbide ceramic materials, viz., SiC–B, SiC–N, SiC–SC–1RN and SiC–HPN by use of a light-gas gun and a small-scale reverse impact technique. The velocities of a tungsten projectile marking the transition between interface defeat and penetration have been determined and compared with the Vickers hardness and fracture toughness of the ceramic materials. It is found that the transition velocity increases with the fracture toughness but not with the Vickers hardness. This indicates that, under the prevailing conditions, fracture may have had more influence than plastic flow on the transition. As a consequence, the observed transition velocities may not be the maximum ones achievable, at least not for SiC–B, SiC–N and SiC–SC–1RN. By suppression of the initiation and propagation of cracks through increase of the confining pressure, it may be possible to increase the transition velocities.

  • 26.
    Lundberg, Patrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Renström, René
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Impact of conical tungsten projectiles on flat silicon carbide targets: Transition from interface defeat to penetration2006In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 32, no 11, p. 1842-1856Article in journal (Refereed)
    Abstract [en]

    Normal impact of conical tungsten projectiles on flat silicon carbide targets was studied experimentally and numerically for half apex angles 5° and 5–15°, respectively, and comparisons were made with cylindrical projectiles. A 30 mm powder gun and two 150 kV and four 450 kV X-ray flashes were used in the impact tests. The numerical simulations were run with the Autodyn code in two steps. In the first, the surface loads were determined for different impact velocities under assumed condition of interface defeat. In the second, these surface loads were applied to the targets in order to obtain critical states of damage and failure related to the transition between interface defeat and penetration, and the corresponding critical velocities. In the impact tests, interface defeat occurred below a transition velocity, which was significantly lower for the conical than for the cylindrical projectiles. Above the transition velocity, the initial penetration of conical projectiles differed markedly from that usually observed for cylindrical projectiles. It occurred along a cone-shaped surface crack, qualitatively corresponding to surface failure observed in the simulations. The transition velocity for the conical projectile was found to be close to the critical velocity associated with this surface failure.

  • 27.
    Lundberg, Patrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences.
    Renström, René
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Lundberg, Bengt
    Impact of metallic projectiles on ceramic targets: transition between interface defeat and penetration2000In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 24, no 3, p. 259-275Article in journal (Refereed)
    Abstract [en]

    Armour systems capable of defeating an incoming projectile on the surface of a ceramic have been reported by several authors. This capability, called interface defeat, signifies that the projectile material is forced to flow radially outwards on the surface of the ceramic without penetrating significantly. In order to investigate the conditions for interface defeat, two models for the interaction of a metallic projectile and a ceramic target were established. With the aid of them, upper and lower bounds for the transition impact velocity between interface defeat and normal penetration were estimated for a given combination of metallic projectile and ceramic target. These approximate bounds were found to be consistent with transition velocities determined experimentally for two projectile materials (tungsten and molybdenum) and five target materials (two types of silicon carbide, boron carbide, titanium diboride and a polycrystalline diamond composite).

  • 28.
    Lundberg, Patrik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Westerling, Lars
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Influence of scale on the penetration of tungsten rods into steel-backed alumina targets1996In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 18, no 4, p. 403-416Article in journal (Refereed)
    Abstract [en]

    As ballistic tests are often performed in reduced geometrical scale, the scaling laws are important for the interpretation of the results. In this study, we tested the validity of replica scaling, by which we mean that all geometrical dimensions are scaled uniformly, while the materials and the impact velocity are kept the same. Long tungsten projectiles with length-to-diameter ratio 15 were fired against unconfined alumina targets with steel backing. The tests were carried out with impact velocities 1500 m s−1 and 2500 m s−1, and in three different scales with projectile lengths 30, 75 and 150 mm (diameters 2, 5 and 10 mm). The alumina targets were photographed by means of a high-speed camera, and the tungsten projectiles were photographed inside the alumina targets by means of flash radiography. Also, the residual penetrations in the steel backings were measured. The Johnson-Holmquist model for ceramic materials was implemented into the AUTODYN code, which was used for simulation of the experiments. The agreement between results of experiment and simulation was fair, and over the tested interval of scales replica scaling was found to be valid with reasonable accuracy.

  • 29.
    Mahata, K
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Technology, Department of Engineering Sciences, Solid Mecanics. AUTOMATIC CONTROL.
    Mousavi, S
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Söderström, T
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Technology, Department of Engineering Sciences, Solid Mecanics. AUTOMATIC CONTROL.
    Mossberg, M
    Valdek, U
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Hillström, L
    On the use of flexural wave propagation experiments for identification of complex modulus2003In: IEEE Transactions on Control Systems Technology, Vol. 11, no 6, p. 863-874Article in journal (Refereed)
  • 30. Mahata, K
    et al.
    Mousavi, S
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Technology, Department of Engineering Sciences, Solid Mecanics.
    Söderström, T
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Technology, Department of Engineering Sciences, Solid Mecanics. AUTOMATIC CONTROL.
    Valdek, U
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Mathematics and Computer Science, Department of Information Technology, Automatic control. Technology, Department of Engineering Sciences, Solid Mecanics.
    Using boundary conditions for estimation of complex modulus from flexural wave experiments2005In: IEEE Transactions on Control Systems Technology, Vol. 13, no 6, p. 1093-1099Article in journal (Refereed)
  • 31. Mahata, Kaushik
    et al.
    Mousavi, Saed
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Söderström, Torsten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    On the estimation of complex modulus and Poisson's ratio using longitudinal wave experiments2006In: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 20, no 8, p. 2080-2094Article in journal (Refereed)
    Abstract [en]

    In this paper we consider different least-squares-based approaches for estimating the complex Young's modulus and the complex Poisson's ratio of a viscoelastic material using a longitudinal wave propagation experiment. We present a statistical analysis of different estimation approaches and compare their performances. The analytical covariance expressions are validated using experimental data.

  • 32.
    Mahata, Kaushik
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mecanics. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Söderström, Torsten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mecanics. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Hillström, L
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mecanics.
    Computationally efficient estimation of wave propagation functions from 1-D wave experiments on viscoelastic materials2004In: Automatica, ISSN 0005-1098, E-ISSN 1873-2836, Vol. 40, no 5, p. 713-727Article in journal (Refereed)
  • 33.
    Mousavi, S
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Identification of complex moduli and Poisson's ratio from measured strains on an impacted bar2003In: 5thEuromech Solid Mechanics Conference ESMC-5, 2003, p. 424-Conference paper (Other scientific)
  • 34.
    Mousavi, S
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Nicolas, D F
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Identification of complex moduli and Poisson's ratio from measured strains on an impacted bar.2004In: Journal of Sound and Vibration, Vol. 277, p. 971-989Article in journal (Refereed)
  • 35.
    Mousavi, Saed
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mecanics.
    Identification of Viscoelastic Materials by Use of Wave Propagation Methods2007Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    Complex moduli and Poisson’s ratio have been estimated using extensional and torsional wave experiments. The data were used for assessment of linearity and isotropy of two polymers, polymethyl methacrylate (PMMA) and polypropylene (PP). The responses of both materials were found to be close to linear and isotropic. A statistical analysis of different estimation approaches for complex modulus and Poisson’s ratio was conducted. It was shown that a joint estimation of complex modulus and Poisson’s ratio improves the estimated results. Considerable improvement was achieved in the frequency range 5-15 kHz for Poisson’s ratio.

    A non-equilibrium split Hopkinson pressure bar (SHPB) procedure for identification of complex modulus has been developed. Two simplified procedures were also established. Both overestimated the magnitude of the complex modulus. The complex modulus of PP was identified using PMMA and aluminium bars, and the estimated complex modulus was in good agreement with published results. The procedure was found to be accurate regardless of the specimen size or the specimen-to-bar impedance ratio. The procedure was also used to analyze the mechanical response of four compacted pharmaceutical tablet materials. A Debye-like relaxation was observed for all tested materials.

    Utilizing SHPB effectively requires knowledge about the impact process that is normally used for excitation. Therefore the impact between a cylindrical striker and a long cylindrical bar of viscoelastic material was studied theoretically and experimentally. Strains measured at three locations along a PMMA bar impacted by strikers of the same material agreed well with the theoretical results.

    A method for identification of complex shear modulus from measured shear strains on a disc subjected to a transient torque at its centre has been established. The two-dimensional wave solutions used are exact in the sense of three-dimensional theory. The results from experimental tests with different load amplitudes and durations agree well with each other.

    List of papers
    1. Identification of complex moduli and Poisson’s ratio from measured strains on an impacted bar
    Open this publication in new window or tab >>Identification of complex moduli and Poisson’s ratio from measured strains on an impacted bar
    2004 (English)In: Journal of Sound and Vibration, Vol. 277, p. 971-986Article in journal (Refereed) Published
    Identifiers
    urn:nbn:se:uu:diva-96479 (URN)
    Available from: 2007-11-07 Created: 2007-11-07 Last updated: 2009-03-26Bibliographically approved
    2. On the estimation of complex modulus and Poisson's ratio using longitudinal wave experiments
    Open this publication in new window or tab >>On the estimation of complex modulus and Poisson's ratio using longitudinal wave experiments
    2006 (English)In: Mechanical systems and signal processing, ISSN 0888-3270, E-ISSN 1096-1216, Vol. 20, no 8, p. 2080-2094Article in journal (Refereed) Published
    Abstract [en]

    In this paper we consider different least-squares-based approaches for estimating the complex Young's modulus and the complex Poisson's ratio of a viscoelastic material using a longitudinal wave propagation experiment. We present a statistical analysis of different estimation approaches and compare their performances. The analytical covariance expressions are validated using experimental data.

    Keyword
    estimation, complex modulus, Poisson's ratio, viscoelasticity, statistical analysis
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-96480 (URN)10.1016/j.ymssp.2005.01.006 (DOI)000240556000016 ()
    Available from: 2007-11-07 Created: 2007-11-07 Last updated: 2017-12-14Bibliographically approved
    3. Non-equilibrium split Hopkinson pressure bar procedure for non-parametric identification of complex modulus
    Open this publication in new window or tab >>Non-equilibrium split Hopkinson pressure bar procedure for non-parametric identification of complex modulus
    2005 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 31, no 9, p. 1133-1151Article in journal (Refereed) Published
    Abstract [en]

    A split Hopkinson pressure bar procedure was developed for non-parametric identification of complex modulus under conditions of non-equilibrium and axially non-uniform stress. Two simplified procedures were also established. The first requires low frequency and/or short specimen. The second, identical to a classical procedure based on equilibrium, requires that also the specimen-to-bar characteristic impedance ratio be low. Both overestimate the magnitude of the complex modulus, the second even at low frequencies. Tests were carried out with polymethyl methacrylate and aluminium bars and with polypropylene specimens having diameter 20 mm and lengths 10, 20, 50 and 100 mm. The complex moduli identified are in good to fair agreement with published results up to 10 kHz for all specimens with polymethyl methacrylate bars and for the 10–50 mm specimens with aluminium bars. The quality of the results is sensitive to truncation and to imperfect contact at the bar-specimen interfaces.

    Keyword
    Split Hopkinson pressure bar, SHPB, Non-equilibrium, Non-parametric identification, Estimation, Complex modulus, Polypropylene
    National Category
    Other Materials Engineering
    Identifiers
    urn:nbn:se:uu:diva-96481 (URN)10.1016/j.ijimpeng.2004.07.002 (DOI)
    Available from: 2007-11-07 Created: 2007-11-07 Last updated: 2017-12-14
    4. Viscoelastic characterization of compacted pharmaceutical excipient materials by analysis of frequency-dependent mechanical relaxation processes
    Open this publication in new window or tab >>Viscoelastic characterization of compacted pharmaceutical excipient materials by analysis of frequency-dependent mechanical relaxation processes
    2005 (English)In: The European Physical Journal E Soft matter, ISSN 1292-8941, E-ISSN 1292-895X, Vol. 18, no 1, p. 105-112Article in journal (Refereed) Published
    Abstract [en]

    A newly developed method for determining the frequency-dependent complex Young's modulus was employed to analyze the mechanical response of compacted microcrystalline cellulose, sorbitol, ethyl cellulose and starch for frequencies up to 20 kHz. A Debye-like relaxation was observed in all the studied pharmaceutical excipient materials and a comparison with corresponding dielectric spectroscopy data was made. The location in frequency of the relaxation peak was shown to correlate to the measured tensile strength of the tablets, and the relaxation was interpreted as the vibrational response of the interparticle hydrogen and van der Waals bindings in the tablets. Further, the measured relaxation strength, holding information about the energy loss involved in the relaxation processes, showed that the weakest material in terms of tensile strength, starch, is the material among the four tested ones that is able to absorb the most energy within its structure when exposed to external perturbations inducing vibrations in the studied frequency range. The results indicate that mechanical relaxation analysis performed over relatively broad frequency ranges should be useful for predicting material properties of importance for the functionality of a material in applications such as, e.g., drug delivery, drug storage and handling, and also for clarifying the origin of hitherto unexplained molecular processes.

    National Category
    Engineering and Technology
    Research subject
    Nano technology and functional materials
    Identifiers
    urn:nbn:se:uu:diva-76735 (URN)10.1140/epje/i2005-10032-8 (DOI)
    Available from: 2006-03-14 Created: 2009-02-26 Last updated: 2017-12-14Bibliographically approved
    5. Viscoelastic impact between a cylindrical striker and a long cylindrical bar
    Open this publication in new window or tab >>Viscoelastic impact between a cylindrical striker and a long cylindrical bar
    Show others...
    2008 (English)In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 35, no 4, p. 226-239Article in journal (Refereed) Published
    Abstract [en]

    Axial impact between a cylindrical striker of finite length and a long cylindrical bar, both of linearly viscoelastic materials, is considered. General results are derived for the impact force, the particle velocity and the strain in the bar in terms of closed-contour integrals. Such results are derived also for the transfer of momentum and energy from the striker to the bar. Numerical results for a striker and a bar made of the same material but with different cross-sectional areas are compared. In viscoelastic impact, unlike elastic impact, the duration of contact may be finite and larger than two transit times for a wave front through the striker due to the formation of a tail of finite length after the main pulse. Furthermore, multiple contacts and separations of the striker and the bar may occur within a range of striker-to-bar characteristic impedance ratios. In the case of viscoelastic impact studied numerically, the duration of contact is at least as long and the momentum and energy transferred are at most as large as in elastic impact. Strains measured at three locations of a polymethyl methacrylate (PMMA) bar impacted by strikers of the same material as the bar agree well with the theoretical results.

    Keyword
    Impact, Viscoelastic, Bar, Force, Momentum, Energy
    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-96483 (URN)10.1016/j.ijimpeng.2007.02.003 (DOI)000252197000003 ()
    Available from: 2007-11-07 Created: 2007-11-07 Last updated: 2017-12-14Bibliographically approved
    6. Identification of complex shear modulus from measured shear strains on a circular disc subjected to transient torsion at its centre
    Open this publication in new window or tab >>Identification of complex shear modulus from measured shear strains on a circular disc subjected to transient torsion at its centre
    2008 (English)In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 313, no 3-5, p. 567-580Article in journal (Refereed) Published
    Abstract [en]

    A method for identification of complex shear modulus from measured shear strains on a circular disc subjected to a transient torque at its centre has been established. It is based on the evolution of an outgoing shear wave between two radial positions at which the associated shear strains are measured. The two-dimensional shear wave solutions used are exact in the sense of three-dimensional theory. Therefore, in principle, there is no frequency beyond which they are not valid. The method requires a minimum disc size, which is related to the duration of the load. The non-parametric results become inaccurate at frequencies near zero and at certain problematic frequencies where the excitation of the disc is weak or non-existent. These frequencies may be moved outside the frequency range of interest by sufficiently decreasing the duration of the load. If there are problematic frequencies within this range, the results of parametric identification become more accurate than those of non-parametric identification. Parametric results from experimental tests with loads having different amplitudes and durations agree well with each other in accord with the assumed linearity of the tested polypropylene material.

    National Category
    Engineering and Technology
    Identifiers
    urn:nbn:se:uu:diva-96484 (URN)10.1016/j.jsv.2007.12.010 (DOI)000255790600014 ()
    Available from: 2007-11-07 Created: 2007-11-07 Last updated: 2017-12-14Bibliographically approved
  • 36.
    Mousavi, Saed
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Hillström, Lars
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Identification of complex shear modulus from measured shear strains on a circular disc subjected to transient torsion at its centre2008In: Journal of Sound and Vibration, ISSN 0022-460X, E-ISSN 1095-8568, Vol. 313, no 3-5, p. 567-580Article in journal (Refereed)
    Abstract [en]

    A method for identification of complex shear modulus from measured shear strains on a circular disc subjected to a transient torque at its centre has been established. It is based on the evolution of an outgoing shear wave between two radial positions at which the associated shear strains are measured. The two-dimensional shear wave solutions used are exact in the sense of three-dimensional theory. Therefore, in principle, there is no frequency beyond which they are not valid. The method requires a minimum disc size, which is related to the duration of the load. The non-parametric results become inaccurate at frequencies near zero and at certain problematic frequencies where the excitation of the disc is weak or non-existent. These frequencies may be moved outside the frequency range of interest by sufficiently decreasing the duration of the load. If there are problematic frequencies within this range, the results of parametric identification become more accurate than those of non-parametric identification. Parametric results from experimental tests with loads having different amplitudes and durations agree well with each other in accord with the assumed linearity of the tested polypropylene material.

  • 37.
    Mousavi, Saed
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mecanics.
    Nicolas, David
    Lundberg, Bengt
    Identification of complex moduli and Poisson’s ratio from measured strains on an impacted bar2004In: Journal of Sound and Vibration, Vol. 277, p. 971-986Article in journal (Refereed)
  • 38.
    Mousavi, Saed
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Valdek, Urmas
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Welch, Ken
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Lundberg, Bengt
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences. Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences, Solid Mecanics. Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    SHPB technique for identification of complex modulus under condition of non-uniform stress2004In: ICTAM04 Abstracts and CD-ROM Proceedings, 2004, p. 446-Conference paper (Other academic)
  • 39.
    Mousavi, Saed
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Welch, Kenneth
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Nanotechnology and Functional Materials.
    Valdek, Urmas
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Non-equilibrium split Hopkinson pressure bar procedure for non-parametric identification of complex modulus2005In: International Journal of Impact Engineering, ISSN 0734-743X, E-ISSN 1879-3509, Vol. 31, no 9, p. 1133-1151Article in journal (Refereed)
    Abstract [en]

    A split Hopkinson pressure bar procedure was developed for non-parametric identification of complex modulus under conditions of non-equilibrium and axially non-uniform stress. Two simplified procedures were also established. The first requires low frequency and/or short specimen. The second, identical to a classical procedure based on equilibrium, requires that also the specimen-to-bar characteristic impedance ratio be low. Both overestimate the magnitude of the complex modulus, the second even at low frequencies. Tests were carried out with polymethyl methacrylate and aluminium bars and with polypropylene specimens having diameter 20 mm and lengths 10, 20, 50 and 100 mm. The complex moduli identified are in good to fair agreement with published results up to 10 kHz for all specimens with polymethyl methacrylate bars and for the 10–50 mm specimens with aluminium bars. The quality of the results is sensitive to truncation and to imperfect contact at the bar-specimen interfaces.

  • 40.
    Nauclér, Peter
    et al.
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    Lundberg, Bengt
    Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid Mechanics.
    Söderström, Torsten
    Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Division of Systems and Control. Uppsala University, Disciplinary Domain of Science and Technology, Mathematics and Computer Science, Department of Information Technology, Automatic control.
    A mechanical wave diode: Using feedforward control for one-way transmission of elastic extensional waves2007In: IEEE Transactions on Control Systems Technology, ISSN 1063-6536, E-ISSN 1558-0865, Vol. 15, no 4, p. 715-724Article in journal (Refereed)
  • 41.
    Nilsson, M
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Mechanics of an Electrorheological Fluid2002Licentiate thesis, monograph (Other scientific)
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    Nilsson, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Ohlson, N G
    An Electrorheological Fluid in Squeeze Mode2000In: Journal of Intelligent Material Systems and Structures, Vol. 11, no 7, p. 545-554Article in journal (Refereed)
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    Nilsson, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Ohlson, N G
    Mechanical and Electrical Properties of an Electrorheological Fluid2000In: Journal of Intelligent Material Systems and Structures, Vol. 11, no 7, p. 555-556Article in journal (Refereed)
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    Nilsson, M
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. SOLID MECHANICS.
    Ohlson, N GDepartment of Engineering Sciences, Solid Mecanics.
    Vibration control by means of electro-rheological fluids1998Conference proceedings (editor) (Refereed)
  • 45.
    Noresson, V
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Ohlson, N G
    A critical study of the Bingham model in squeeze-flow mode2001In: Materials and Design, Vol. 22, p. 651-658Article in journal (Refereed)
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    Noresson, V
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Ohlson, N G
    Nilsson, M
    Design of Electrorheological Dampers by Means of Finite Element Analysis: Theory and Applications2002In: Materials and Design, Vol. 23, p. 361-369Article in journal (Refereed)
  • 47.
    Nygren, T
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    On Transmission, Reflection and Dissipation of Extensional Wave Energy at a Non-uniform Viscoelastic Junction between Elastic Bars1995Licentiate thesis, monograph (Other scientific)
  • 48.
    Nygren, T
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    On transmission, reflection and dissipation of extensional wave energy at a non-uniform viscoelastic junction between elastic bars1995Other (Other scientific)
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    Nygren, T
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Andersson, LE
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Optimization of elastic junctions with regard to transmission of wave energy1999In: WAVE MOTION, ISSN 0165-2125, Vol. 29, no 3, p. 223-244Article in journal (Refereed)
    Abstract [en]

    Transmission of the energy of an incident extensional wave through an elastic junction between two uniform and collinear bars is considered. The junction consists of a finite number of uniform segments with equal transit times. We seek the optimum junctio

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    Nygren, T
    et al.
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Andersson, L-E
    Lundberg, B
    Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Materials Science. Department of Engineering Sciences, Solid Mecanics. Hållfasthetslära.
    Optimum transmission of waves through a non-uniform viscoelastic junction between elastic bars1996In: Eur. J. Mech., A/Solids, Vol. 15, no 1, p. 29-49Article in journal (Refereed)
12 1 - 50 of 69
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