On matrix crack growth in quasi-isotropic laminates—II. Finite element analysis

Abstract Multiple matrix crack growth behaviour in a quasiisotropic ( 0/90 −45/ + 45 ) s laminate has been simulated by using generalised plane-strain finite element models. Representative models have been developed to describe the sequential matrix cracking events observed from the experiments, as reported in Part I of this paper. These models provide quantitative predictions of stiffness reduction due to matrix cracking which are in good agreement with the experimental results. These results show that 90 ° and + 45 ° cracking are the major damage events governing the degradation of the laminate elastic properties with the contribution from the −45 ° cracking being less important. The models provide information concerning stress distributions in the vicinity of existing cracks, which enable the transfer lengths for cracks in the 90 ° ply to be estimated and may facilitate the study of failure mechanisms at the local level.

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