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提出了基于z-pin桥联力试验的z-pin增强复合材料T型接头层间性能的模拟方法。每根z-pin的作用有两部分:增加了分层的张开阻力与剪切阻力。在有限元模拟中通过在相应的节点上加两个方向(竖直方向和水平方向)的非线性弹簧模拟张开阻力和剪切阻力。通过张开型z-pin桥联力试验和剪切型z-pin桥联力试验得到两条力-位移曲线,再把曲线各自赋予到所有竖直非线性弹簧和水平非线性弹簧,从而模拟z-pin对复合材料T型接头层间性能的增强效果。在T型接头拉拔试验模拟分析中,研究了不同跨距和不同z-pin间距对拉拔力的影响。模拟分析表明跨距对拉脱位移影响较大,z-pin间距对最大拉拔力影响较大。
A simulation method for the interlayer performance of z-pin reinforced composite T-joints based on the z-pin bridge force test is proposed. The role of each z-pin has two parts: increased stratified open resistance and shear resistance. In the finite element simulation, the open resistance and the shear resistance are simulated by adding non-linear springs in two directions (vertical direction and horizontal direction) to the corresponding nodes. Two force-displacement curves were obtained by the open-type z-pin test and the shear z-pin test, then the curves were given to all the vertical nonlinear springs and the horizontal non-linear springs respectively to simulate Z-pin on the T-joint composite materials to enhance the performance of the interlayer. In the T-joint pullout test simulation analysis, the impact of different span and different z-pin spacing on the pullout force was studied. Simulation results show that the span has a great influence on the pull-out displacement, and the z-pin spacing has a great influence on the maximum pull-out force.