含圆孔复合材料层板在拉伸载荷下损伤破坏过程的模拟

Damage failure modeling for composite laminates containing openings and subjected to tensile loadings

本文应用有限元法模拟受拉含孔夏合材料层板损伤起始、累积直至破坏的过程。在模拟中引入了作者早些时建立的包含基体开裂层非对称约束影响的损伤本构关系，以及裂纹密度与损伤区应力关系函数等。本文给出损伤累积模拟方法并编制了程序，用该程序可以获得层板加载过程中各层的损伤状态、计算其刚度衰减和应力重分布以及最终破坏载荷。给出了数值模拟算例并与现有研究结果进行了比较。

Finite element approach was used to model the damage progression in laminated composites containingan open hole subjected to in-plane loading.In the damage constitutive relations of a composite lamina with ma-trix cracking,nonsymmetrical constraint effects of neighbouring plies was considered.The crack density as afunction of the stress of damage zone was constructed.The generalization of the damage constitutive relationswas made for any off-axis laminate by rotating coordinate in twice. Numerical calculations were done andwere compared with experimental data.Based on the finite element analysis,the types and extent of damage inthe plate as a function of applied load can be obtained.The stiffness degradation of damaged lamina,the pro-gression of damage and the ultimate strength of the plate can be predicted.