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本文利用三维有限元模型对Z-pin/缝合增强试验件进行有限元分析,采用内聚力模型模拟界面的破坏情况,通过在分层的上下界面加入非线性弹簧元来模拟Z-pin/缝合的增强机制,非线性弹簧元的力学性能(桥联律)由细观力学方法获得。通过与试验结果的对比发现,由于未进行界面增强的T型结构的剪切承载能力已较高,Z-pin/缝合增强较难提高T型接头的剪切承载能力。从少数几种可提高T型接头的剪切承载能力的增强方案看到,应选择拉伸强度较高而拉伸模量较低的缝线来进行T型接头剪切界面增强设计。
In this paper, the finite element analysis of the Z-pin / suture reinforced test piece is conducted by using the three-dimensional finite element model. The cohesion model is used to simulate the failure of the interface and the nonlinear spring element is added to the upper and lower stratified interfaces to simulate the Z-pin / suture reinforcement Mechanics, mechanical properties of nonlinear spring elements (bridging laws) are obtained by meso-mechanics. By comparing with the experimental results, it is found that the Z-pin / suture reinforcement is difficult to improve the shear bearing capacity of T-joints because of the high shear bearing capacity of the T-structure without interface enhancement. From a few enhancement schemes that can improve the shear bearing capacity of T-joints, we should choose the suture with higher tensile strength and lower tensile modulus to design the T-joint shear interface enhancement.