纤维增强复合材料层板高速倾斜冲击损伤数值模拟

Numerical simulation of damage in fiber reinforce composite laminates under high velocity oblique impact

根据复合材料三维黏弹性本构关系,建立了纤维增强复合材料层板高速倾斜冲击损伤的数值分析模型。该模型在复合材料层间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识别,引入材料刚度折减方案,采用非线性有限元方法,研究高速倾斜冲击下复合材料层板的破坏过程和损伤特性。研究结果表明:层板的主要损伤形式是层间分层、基体微裂纹和纤维断裂;冲击速度不变而入射角度增大时,剩余速度减小,层板损伤面积在一定入射角度范围内有明显变化;入射角度不变而冲击速度增大时,剩余速度增大,层板损伤面积在一定速度范围内也有明显变化。

The simulation model was established for the damage analysis of laminated polymer matrix composites under high velocity oblique impact by 3D visco elastic constitutive equations. The cohesive elements were involved between layers to simulate delaminations and the 3D-Hashin failure criteria were used to predict the in-plane damage. Furthermore, the failure process and damage characters of composite laminates under high velocity oblique impact were studied by the non linear finite element method and stiffness reduction schemes. It is found that the delamination, matrix crack and fiber breakage are the main damage modes of composite laminates. The residual velocity reduces and damage area changes markedly within a certain range of entering angles when entering angle increases and impact velocity keeps unchanged. The residual velocity increases and damage area changes markedly within a certain range of entering angles when entering angle keeps unchanged and impact velocity increases.