复合材料层合板静态压痕与损伤行为

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。

Static indentation and corresponding damage of composite laminate

Criteria for intralaminar and delamination failures of composite laminate were developed in which transverse residual shear deformation and interfacial residual opening were modeled.A brick finite element including multiple-plies was suggested in order to decrease computing costs in ply-by-ply damage analysis of composites.Quasi-static 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 proposed models are validated by experimental measurements.