Statistical analysis of oblique crack evolution in composite laminates
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abstract
A previously developed statistical model for transverse cracking in cross ply laminates is extended to oblique cracking in multidirectional laminates. The oblique cracks are assumed to form in a ply when the local in-plane tensile stress normal to fibers exceeds the transverse strength of the ply. This strength is assumed to have a statistical distribution given by a two-parameter Weibull function. The model is applied to a glass-epoxy [0/60 2/0/-602]s laminate in which cracking evolution of the four -60 plies in the middle of the laminate is examined. The local stress field in the cracked -60plies is calculated by a three-dimensional finite element method based on a unit cell construction developed by Li et al. [1]. The measured crack density is found to agree well with that calculated by the statistical model. 2014 Elsevier Ltd. All rights reserved.
