复合材料层合板静态压痕与损伤行为

Static indentation and corresponding damage of composite laminate

发展了层合复合材料面内及分层失效模型,模型考虑了横向压剪残余剪切变形和分层残余相对位移。提出一种块体单元包含若干铺层的模型,以减少复合材料逐层分析时的计算量。对一种碳纤/环氧层合复合材料进行了横向压痕试验,测量了不同压力下凹坑的深度,用超声C扫测得损伤面积。用发展的模型在ABAQUS平台上通过用户材料子程序UMAT模拟了上述试验,分析了试验曲线特征点对应的损伤机制,通过与试验结果的对比,验证了本文模型的合理性。

Criteria for intralaminar and delamination failures of composite laminate were developed in which trans- verse residual shear deformation and interracial residual opening were modeled. A brick finite element including mul- tiple-plies was suggested in order to decrease computing costs in ply-by-ply damage analysis of composites. Quasistatic indentation tests were conducted to a carbon fiber/epoxy matrix composite laminate. The indent depth under different contact force was measured and damage areas were obtained by C-scan. The experiments were simulated by the proposed models in the Abaqus by user-defined material subroutine （UMAT）. The damage modes corresponding to the characteristic points on tested force-displacement curves were identified via numerical simulations. The pro- posed models are validated by experimental measurements.