Effect of various parameters on the effective properties of a cracked ply

摘要: Damage in composite materials accumulates a diffuse manner. Accounting for this damage progressive failure analysis requires an accurate measure of the degraded stiffness coefficients. This paper describes micromechanics models predicting effect distributed cracks on engineering properties (extensional moduli, shear and Poisson's ratios). Quasi-3D 3D finite element methods were employed to determine effective material cracked ply. Analyses performed various systems, states, adjacent (to ply) ply properties. The results show that are very sensitive initial These also found be orientation. However, they not much affected by plies. Relationships describing sensitivity obtained. relationships useful explaining degradation behavior laminates. Quantitative measures presented errors introduced when shear-extension-coupling terms ignored calculating Also, it was proven transverse matrix only affect diagonal compliance certain configurations.