复合材料层合板预紧螺栓连接应力分析

Stress Analysis of Composite Laminate Connected by Preloaded Bolt

针对复合材料层合板预紧螺栓连接结构,建立了全尺寸三维有限元模型,应用非线性接触算法模拟螺栓连接。采用降温法模拟螺栓预紧力,给出了预紧力与等效温度载荷的计算公式。通过分析不同预紧力下的层合板孔边应力分布,得到了预紧力与孔边拉应力以及预紧力与孔边层间应力的关系曲线。

For composite laminate connected by preloaded bolt, a 3D full-size simulating model is built. Nonlinear contact arithmetic is applied to finite element model. Cool method is employed for simulating the bolt＇s preload. Calculating formula between preload and equivalent temperature is introduced. At varying bolt＇s preload, we solve the hole-edge stress of composite laminate, and obtain the relative figures between hole-edge tension stress, holeedge interlaminar shear stress and preload. Useful conclusions are drawn by analysis. The contact finite element model with cool method is reliable and applicable to simulate composite laminate connected by preloaded bolt.