复合材料层压板低速冲击损伤的有限元模拟

Finite Element Simulation of Low Velocity Impact Damage on Composite Laminates

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。

Based on the low velocity impact test, this thesis established a ＂ply-interface-ply＂ laminate finite element model to simulate compos-ite laminates under tow velocity impact. The con-stitutive relations of the composite ply were intro-duced through VUMAT subroutine method, the stress-based failure criteria of composite was used to determine damage effects, and stiffness reduc-tion method was used to simulate the failure process. The cohesive element method was utilized to simulate the delamination behavior.