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On numerical analyses of woven composite laminates: Homogenization, damage and fracture
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Tekniska sektionen, Institutionen för teknikvetenskaper, Tillämpad mekanik. Uppsala University.
2019 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This dissertation analyzes various mechanical properties of textile reinforced composite laminates.

The dissertation is based on a total of six published works, which are essentially numerical, although experimental elements are available. The numerical methods used are based on high-resolution finite element models in combination with sophisticated phase-field theories for brittle fracture. A key result is that important mechanical properties in engineering applications, such as fracture or damage resistance, can be substantially affected by the arrangement of the constituent materials at the meso level.

Ort, förlag, år, upplaga, sidor
Uppsala: Acta Universitatis Upsaliensis, 2019. , s. 53
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1828
Nationell ämneskategori
Teknisk mekanik Rymd- och flygteknik Kompositmaterial och -teknik Textil-, gummi- och polymermaterial
Forskningsämne
Teknisk fysik med inriktning mot tillämpad mekanik
Identifikatorer
URN: urn:nbn:se:uu:diva-388808ISBN: 978-91-513-0699-5 (tryckt)OAI: oai:DiVA.org:uu-388808DiVA, id: diva2:1335367
Disputation
2019-09-13, Siegbahnsalen, The Ȧngström Laboratory, Lägerhuddsvägen 1, Uppsala, 09:15 (Engelska)
Opponent
Tillgänglig från: 2019-08-22 Skapad: 2019-07-05 Senast uppdaterad: 2019-09-17Bibliografiskt granskad
Delarbeten
1. A phase-field model for strength and fracture analyses of fiber-reinforced composites
Öppna denna publikation i ny flik eller fönster >>A phase-field model for strength and fracture analyses of fiber-reinforced composites
2019 (Engelska)Ingår i: Composites Science And Technology, ISSN 0266-3538, E-ISSN 1879-1050, Vol. 174, s. 58-67Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A phase-field model for brittle fracture is proposed and evaluated for strength and fracture analyses of composites. In addition to the elastic properties, this approach makes use of only the fracture toughness and the strength of the material. The capability of the method is shown in analyses of composites at two scales. In laminates, strengths of notched laminates are estimated, including hole size effects. In a lamina, cracks developed in both transverse tension and compression are analyzed and compared to other numerical methods in the literature. The effects of a spectral and a hydrostatic-deviatoric decomposition of the strain energy density, two variants often used in phase-field formulations, are studied. It is shown that the choice of the decomposition affects the fracture development. Results are compared to experiments and simulations in the literature showing the capabilities of the phase-field approach.

Ort, förlag, år, upplaga, sidor
Elsevier, 2019
Nyckelord
Computational mechanics, Strength, Fracture, Finite element analysis (FEA)
Nationell ämneskategori
Kompositmaterial och -teknik
Identifikatorer
urn:nbn:se:uu:diva-368254 (URN)10.1016/j.compscitech.2018.10.031 (DOI)000469407500008 ()
Tillgänglig från: 2018-12-03 Skapad: 2018-12-03 Senast uppdaterad: 2019-07-05Bibliografiskt granskad
2. A study on the influence of boundary conditions in computational homogenization of periodic structures with application to woven composites
Öppna denna publikation i ny flik eller fönster >>A study on the influence of boundary conditions in computational homogenization of periodic structures with application to woven composites
2017 (Engelska)Ingår i: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 160, s. 529-537Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The influence of boundary conditions (BCs) in the estimation of elastic properties of periodic structures is investigated using computational homogenization with special focus on planar structures. Uniform displacement, uniform traction, periodic, in-plane periodic and a proposed mix of periodic and traction BCs are used. First, the effect of the BCs is demonstrated in structures with one-, two- and three-dimensional periodicity. Mixed BCs are shown to most accurately represent the behavior of layered structures with a small number of repeating unit cells. Then, BCs are imposed on a twill woven composite architecture. Special attention is devoted to investigate the sensitivity of the estimated properties with respect to the BCs and to show differences when considering a single lamina or a laminate. High sensitivity of the in-plane extensional modulus and Poisson's ratio with respect to the type of BCs is found. Moreover, it is shown that the mix of BCs and in-plane periodic BCs are capable to represent an experimental strain field.

Nyckelord
Computational homogenization, Mixed boundary conditions, Heterogeneous structures, Elastic properties, Woven composites, Finite element method
Nationell ämneskategori
Kompositmaterial och -teknik
Identifikatorer
urn:nbn:se:uu:diva-359307 (URN)10.1016/j.compstruct.2016.10.082 (DOI)000390470300044 ()
Tillgänglig från: 2018-08-31 Skapad: 2018-08-31 Senast uppdaterad: 2019-07-05Bibliografiskt granskad
3. The effect of free-edges and layer shifting on intralaminar and interlaminar stresses in woven composites
Öppna denna publikation i ny flik eller fönster >>The effect of free-edges and layer shifting on intralaminar and interlaminar stresses in woven composites
2018 (Engelska)Ingår i: Composite structures, ISSN 0263-8223, E-ISSN 1879-1085, Vol. 185, s. 212-220Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The free-edge effects and relative layer shifting in the interlaminar and intralaminar stresses of plain woven composite laminates under uniaxial extension is investigated numerically using a finite element approach. A computational framework of the free-edge problem for periodic structures with finite width is applied to woven laminates. First, two-layered laminates with three different shifting configurations are studied considering repeating unit cells simulating finite and infinite width. For each configuration, two different widths are considered by trimming the model at different locations in order to investigate different free-edge effects. Then, two four-layered laminates with no shifting and a maximum shifting configuration are analyzed to illustrate the effect of neighboring layers in the stresses. For each shifting configuration, different delamination mechanisms are expected. When considering more layers, it is found that the stacking configuration affects the state of stress and the free-edge effects depending on the shifting. In general, a different behavior than that of unidirectional tape laminates is found, since the interlaminar and intralaminar stresses can be higher than those generated at the free-edges. Particularly, for the maximum shifting configuration results are in agreement with experimental results in the literature where no debonding between yarns was observed at the free-edges.

Nyckelord
Woven composites, Finite element method, Intralaminar stresses, Interlaminar stresses, Free-edge effects, Multiscale modeling
Nationell ämneskategori
Teknisk mekanik
Identifikatorer
urn:nbn:se:uu:diva-341485 (URN)10.1016/j.compstruct.2017.11.014 (DOI)000418961000018 ()
Tillgänglig från: 2018-02-28 Skapad: 2018-02-28 Senast uppdaterad: 2019-07-05Bibliografiskt granskad
4. A study of induced delamination and failure in woven composite laminates subject to short-beam shear testing
Öppna denna publikation i ny flik eller fönster >>A study of induced delamination and failure in woven composite laminates subject to short-beam shear testing
2019 (Engelska)Ingår i: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 205, s. 359-369Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Failure in woven composite laminates subject to global shear load is studied. Laminates are manufactured, tested and analyzed using X-ray computed tomography, scanning electron microscopy and finite element models. It is found that the stress distribution along the thickness direction is dependent on the layer shifting that alters different yarn interactions, which in turn, affects delamination and failure onset A suggested failure mechanism is in agreement with experimental observations.

Nationell ämneskategori
Teknisk mekanik
Identifikatorer
urn:nbn:se:uu:diva-368250 (URN)10.1016/j.engfracmech.2018.10.015 (DOI)000453766000026 ()
Tillgänglig från: 2018-12-03 Skapad: 2018-12-03 Senast uppdaterad: 2019-07-05Bibliografiskt granskad
5. Analysis of the Influence of Layer Shifting on the Elastic Response and Damage Nucleation and Growth in Woven Composite Laminates
Öppna denna publikation i ny flik eller fönster >>Analysis of the Influence of Layer Shifting on the Elastic Response and Damage Nucleation and Growth in Woven Composite Laminates
2018 (Engelska)Ingår i: NASA Technical MemorandumsArtikel i tidskrift (Refereegranskat) Published
Nationell ämneskategori
Teknik och teknologier
Identifikatorer
urn:nbn:se:uu:diva-368253 (URN)
Tillgänglig från: 2018-12-03 Skapad: 2018-12-03 Senast uppdaterad: 2019-07-05
6. Mesoscale analysis of the transverse cracking kinetics in woven composite laminates using a phase-field fracture theory
Öppna denna publikation i ny flik eller fönster >>Mesoscale analysis of the transverse cracking kinetics in woven composite laminates using a phase-field fracture theory
2019 (Engelska)Ingår i: Engineering Fracture Mechanics, ISSN 0013-7944, E-ISSN 1873-7315, Vol. 216, artikel-id 106523Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

A phase-field approach to fracture is used to simulate transverse cracking kinetics in composite laminates. First, a typical unidirectional tape laminate is modeled and the transverse cracking evolution with the consequent reduction in the in-plane modulus of elasticity is estimated. Then, a four-layered plain weave composite is modeled using different layer shifting configurations. Predictions in the transverse cracking evolution become improved as the shifting configuration of the laminate model become closer to experimental observations. Simulations predict that some cracks do not form perpendicularly to the loading direction, as it has been observed experimentally in similar locations. Only the fracture toughness and the in situ transverse strength of the ply are required without prior knowledge of the position of the cracks or an ad hoc criterion for crack evolution. All the simulations are compared qualitatively and quantitatively to experiments published elsewhere.

Nyckelord
Composites, Fibre reinforced materials, Fracture mechanics, Damage mechanics, Crack growth
Nationell ämneskategori
Teknisk mekanik
Forskningsämne
Teknisk fysik med inriktning mot tillämpad mekanik
Identifikatorer
urn:nbn:se:uu:diva-388533 (URN)10.1016/j.engfracmech.2019.106523 (DOI)000477573000028 ()
Tillgänglig från: 2019-07-01 Skapad: 2019-07-01 Senast uppdaterad: 2019-09-20Bibliografiskt granskad

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