轴向冲击作用下玻璃纤维复合材料层合梁脱层及其扩展分析

玻璃纤维增强型复合材料层合梁在受轴向质量块冲击时,由于纤维铺层间的粘结强度较小,该区域易出现初始裂纹.进而扩展为脱层损伤.文章探讨了采用有限元数值模拟对脱层的产生与扩展进行建模、计算分析的方法.针对发生在纤维层问的脱层损伤,基于传统的应力失效准则,结合断裂力学的B-K能量失效准则,建立了混合失效准则来定义界面处的损伤规律,将发生脱层的潜在区域定义为粘结接触.计算结果与实验对比具有较好的一致性.

Finite Element Analysis of Delamination Initiation and Growth in E-Glass/Epoxy Reinforced Laminated Beams under Axial Impact

The initiation and growth of delamination in E-glass/epoxy reinforced laminated beams subjected to axial impact were investigated numerically.Introducing a mixed failure mode which was made up of quadratic nominal stress criterion and BK(Benzeggagt-Kenane)fracture criterion,a finite element model with the cohesive element which was employed to simulate the intra-laminar failure area was established by the commercial software ABAQUS/Explicit.The results show the delamination location and its growth in terms of beam's ply sequence and impact velocity.An experimental setup was used to investigate the dynamic response and failure behavior of the laminated beams.A good agreement was obtained between numerical simulation and experimental results.