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Effects of voids on quasi-static and tension fatigue behaviour of carbon-fibre composite laminates
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Applied Mechanics.
(LuleƄ University of Technology)
2014 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793XArticle in journal, Editorial material (Refereed) Published
Abstract [en]

The effect of voids on quasi-isotropic carbon-fibre reinforced plastic laminates under quasi-static loading is compared with that under cyclic tension loading. Emphasis is placed on following damage development at the non-crimp fabric ply-level by investigating the influence of voids on damage accumulation, most notably transverse cracking and delamination. Details from experiments include micrographs of voids taken in both scanning-electron and light microscopy, measurements of void content and crack density using light microscopy, and stiffness plots from both quasi-static and cyclic tests. The stiffness results are compared with theoretical predictions accounting for transverse cracks. Voids have a significantly more detrimental effect on the mechanical properties in cyclic loading compared with quasi-static loading. Specifically, the stiffness reduction development, the underlying transverse cracking in layers and the number of cycles to failure are affected. Quality control by only quasi-static testing for void-containing composite materials to be used in components subjected to fatigue cannot therefore be recommended.

Place, publisher, year, edition, pages
2014.
National Category
Applied Mechanics
Identifiers
URN: urn:nbn:se:uu:diva-268537OAI: oai:DiVA.org:uu-268537DiVA: diva2:877492
Available from: 2015-12-07 Created: 2015-12-07 Last updated: 2017-12-01

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