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为了分析层压复合材料层间特性,推导了将刚性元-弹簧元相结合的离散型界面单元的刚度矩阵。建立了层压板的准三维模型,即将Mindlin板单元应用于层压板的各子层,层间作用则利用上述界面单元来模拟。通过弯曲板元计算子层面内应力,通过界面单元的弹簧力确定层间应力。对受面内拉伸的多向层压板条进行了应力分析,与使用商业软件三维实体模型计算得到的层间和面内应力对比,结果表明准三维模型的计算结果合理。这种新型界面单元的优点是可用来表征层间损伤,并且能通过对弹簧刚度的消减来模拟分层损伤的演变。
In order to analyze the interlaminar properties of laminated composites, the stiffness matrix of discrete interfacial elements incorporating rigid element-spring elements was derived. The quasi-three-dimensional model of the laminate is established, ie, the Mindlin plate element is applied to each sub-layer of the laminate, and the interaction between layers is simulated by using the above interface element. The interlaminar stress is calculated by bending the plate element and the interlaminar stress is determined by the spring force of the interfacial element. The stress analysis of multi-directional laminate strips subjected to in-plane stretching is compared with the inter-layer and in-plane stresses calculated by the 3D solid model of commercial software. The results show that the quasi-three-dimensional model is reasonable. The advantage of this new interface unit is that it can be used to characterize interlayer damage and to simulate the evolution of delamination damage by reducing the spring stiffness.