复合材料层压板低速冲击损伤的有限元模拟

摘要

Based on the low velocity impact test, this thesis established a "ply -interface -ply" laminate finite element model to simulate composite laminates under low velocity impact. The con-rnstitutive relations of the composite ply were introduced through VUMAT subroutine method, the stress - based failure criteria of composite was used to determine damage effects, and stiffness reduction method was used to simulate the failure process. The cohesive element method was utilized to simulate the delamination behavior.%基于复合材料层压板的低速冲击试验,建立一套“铺层-界面-铺层”的复合材料层压板在低速冲击载荷作用下的有限元模型.通过VUMAT子程序建立复合材料铺层的本构关系,采用应力描述的失效判据来判断层内的各种损伤,并结合相应的刚度折减方案对失效单元进行刚度折减.模型中在相邻两铺层间加入cohesive单元,用来模拟层间界面.