在I型模式下异型截面Z-pin增强效果的数值分析

摘要： 针对单根Z-pin拔出试验以及未增强/Z-pin增强的双悬臂梁（DCB）试验建立了三维有限元仿真模型.在拔出试验的模拟过程中，以静-动摩擦系数模拟Z-pin在基体中的脱胶 拔出过程，以计算所得桥联力作为输入参数，通过连接器模拟Z-pin在层合板中的桥联作用，得到了DCB试验的载荷-位移曲线.同时，将所建模型用于计算异型截面Z-pin的桥联力，以及异型截面Z-pin增强DCB试件的载荷，以定量分析Z-pin截面周长对其增强效果的影响.结果表明，所建立的有限元模型的模拟结果与实验值较吻合.

Numerical Analysis of Reinforcement Effect of Z-Pins withSpecial-Shaped Cross Section Under Mode I Delamination

Numerical Analysis of Reinforcement Effect of Z Pins with Abstract： A 3D finite element model was proposed to simulate a single Z pin for pull out test and for unpinned/Z pinned double cantilever beam (DCB) test. Static and sliding friction coefficients were used to simulate the debonding and pull out process of the Z pin. Connectors were used in the DCB model to simulate the bridging effect of the Z pins with the bridging curves calculated by the pull out model as input data. The bridging curves of the Z-pin with special shaped cross section for the pull out test and the load displacement curves for the DCB test were calculated based on the proposed finite element model. The effect of the cross section perimeter of Z pin on the maximum bridging load was also discussed in detail. The simulation results were in good agreement with the experimental data.