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利用二维平面应变模型对Z-pin增强T型接头试样进行失效分析,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模拟Z-pin的增强作用,非线性弹簧元的力学性能(桥联律)由细观力学方法获得,数值结果与试验值吻合较好。在已验证有限元方法的基础上,研究了Z-pin直径、密度及植入角度等对T型接头拉脱承载能力的影响。结果表明:Z-pin增强可显著提高T型接头的拉脱承载能力,与未Z-pin增强的T型接头相比,Z-pin增强明显延缓了掉载;T型接头的拉脱承载能力随Z-pin直径和密度的增加而增大,随植入角度的增大而减小;在所研究的角度范围内,当植入角度为60°时,T型接头的拉脱承载能力最好;Z-pin直径和密度对拉脱承载能力的影响远比植入角度的影响显著。
The two-dimensional plane strain model is used to analyze the failure of the Z-pin reinforced T-joint specimen. The cohesion model is used to simulate the failure of the interface. The non-linear spring element is added to the upper and lower stratified interfaces to simulate the enhancement effect of Z-pin. The mechanical properties of the linear spring element (bridging law) are obtained by the meso-mechanics method. The numerical results agree well with the experimental values. Based on the verified finite element method, the effects of Z-pin diameter, density and implantation angle on the pull-off carrying capacity of T-joints were studied. The results show that the Z-pin reinforcement can significantly improve the pull-out carrying capacity of T-joints, and the Z-pin reinforcement significantly slows the load shedding compared with the T-joints without Z-pin reinforcement. The pull-off carrying capacity of T-joints With the increase of Z-pin diameter and density, it decreases with the increase of implantation angle. In the studied angle range, when the implantation angle is 60 °, the T-type connector has the highest pull-off carrying capacity The effect of Z-pin diameter and density on the pull-out carrying capacity is better than implanting angle.