正交复合材料层板的微损伤建模研究

Study on Modeling Micro-damage of Cross-ply Laminated Composites

复合材料基体横向开裂和分层损伤是正交层板的主要损伤类型,在由横向基体开裂而诱发的分层损伤对材料刚度衰减影响的研究中,考虑分层影响和模型计算精度先前模型两者难以兼顾。基于剪切滞后分析理论和完全抛物线模型构建方法,建立了修正的包含分层损伤的完全抛物线剪切滞后模型,并依此模型研究了应力与横向裂纹密度的关系,对材料刚度衰减进行了预测计算,并与其它几种模型进行了比较,结果表明,所建模型所得的预测结果与实验值符合得最好。

Transverse cracking and delamination damage are typical damage modes in laminated composites, on the study of the influence between the stiffness degrading and delamination damage induced by the transverse cracking, it is difficult to give attention to the influence of considering delamination and the computing precision by foregoing modes. Based on the shear-lag theory and the constructed way of the complete parabolic shear-lag analysis mode, a revised model was constructed. The relation of the stress and the transverse cracks density was studied, the predicted stiffness degrading was calculated, which compared with the others modes. The results show that the value obtained by the revised model is the best one to agree with the experimental data.