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Effect of boundary conditions on microdamage initiation in thin-ply composite laminates

Abstract : The Energy Release Rate (ERR) and the contact zone size for a fiber/matrix interface debond are studied for a thin-ply glass fiber/epoxy laminate. The main objective is to analyze the effect on the debonding process of the presence of a traction-free specimen surface or an adjacent material, in the form of a stiffer UD ply or by considering it as part of a thick 90° layer, at different levels of fiber content. To this end, a model of Representative Volume Element (RVE) subjected to different combinations of boundary conditions is proposed. It is found that the constraining effect of the adjacent ply favors at high fiber volume fractions the opening of small debonds (10 − 40°) for the same level of strain. The results agree well and provide a mechanical explanation of previous microscopic observations available in the literature.
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https://hal.archives-ouvertes.fr/hal-01850741
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Submitted on : Friday, July 27, 2018 - 5:03:01 PM
Last modification on : Wednesday, November 3, 2021 - 7:09:48 AM
Long-term archiving on: : Sunday, October 28, 2018 - 1:57:09 PM

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Luca Di Stasio, Janis Varna, Zoubir Ayadi. Effect of boundary conditions on microdamage initiation in thin-ply composite laminates. 18th European Conference on Composite Materials (ECCM18), Jun 2018, Athènes, Greece. ⟨hal-01850741⟩

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