边界条件对纤维增强复合材料层板高速冲击损伤影响的数值模拟

Numerical Simulation of High Speed Impact Damage Dependence on Boundary Condition in Fiber Reinforced Laminated Composite

根据复合材料三维粘弹性本构关系,建立纤维增强复合材料层板高速冲击损伤的有限元分析模型。模型中引入界面单元模拟层间分层,结合三维Hashin失效准则进行单层板面内损伤判断。对数值结果进行分析,得到如下结论:边界四面不带应力层板的损伤面积最大,两个对面带应力层板的损伤面积次之,一面和三面带应力层板的损伤面积最小;边界应力增大而冲击速度不变时,剩余速度基本不变,损伤面积先增大后减小;冲击速度增大而边界应力不变时,剩余速度线性增大,损伤面积先增大后减小。

Based on the 3D visco-elastic constitutive equations of composite, a finite element model was proposed for the damage analysis of fiber reinforce composite laminates under high velocity impact. The cohesive elements were involved between layers to simulate delaminations and the 3D-Hashin failure criteria were used to predict the in-plane damage. Damage area of laminates with no boundary stress is the large, these with two opposite stress faces are intermediate, and those with one stress faces and three stress faces are the small. The residual velocity remains unchanged and the damage area increases first and then decreases when the impact velocity keeps invariable but the boundary stress increases. On the other hand the residual velocity increases linearly and damage area first increases and then decreases when impact velocity increases and boundary stress keeps constant.