Effects of voids on quasi-static and tension fatigue behaviour of carbon-fibre composite laminates
2014 (English)In: Journal of composite materials, ISSN 0021-9983, E-ISSN 1530-793XArticle in journal, Editorial material (Refereed) Published
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.
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IdentifiersURN: urn:nbn:se:uu:diva-268537OAI: oai:DiVA.org:uu-268537DiVA: diva2:877492