The effectiveness of studying inter-laminar delamination in laminated composites with the help of thickness-stretch shell elements which utilize a 3-D material model sub-routine as compared to the traditional plane-stress shell elements has been investigated using a non-linear finite element solver (LS-DYNA®). A strain-rate-dependent micro-mechanical material model using ply-level progressive failure criteria has been used to simulate the initiation and propagation of delamination. A methodology of assigning physical significance to the choice of damage parameters has been presented. The numerical delamination growth has been qualitatively analyzed against the experimental C-scan images for multiple impact events on different composite plates.

中文翻译：

---

使用壳单元和应变率相关微机械模型研究复合材料层合板的分层

与传统的平面应力壳单元相比，在厚度-拉伸壳单元的帮助下研究层状复合材料中层间分层的有效性，与传统的平面应力壳单元相比，已经使用非线性有限元进行了研究。单元求解器 (LS-DYNA®)。使用层级渐进破坏准则的应变率相关微机械材料模型已用于模拟分层的开始和传播。已经提出了一种为损伤参数的选择分配物理意义的方法。针对不同复合板上多次撞击事件的实验 C 扫描图像，对数值分层增长进行了定性分析。