复合材料双曲率壳屈曲和后屈曲的非线性有限元研究

Buckling and postbuckling response analysis of the doubly-curved composite shell by nonlinear FEM

基于ABAQUS软件分析平台,采用非线性有限元法研究了横向载荷作用下复合材料双曲率壳的屈曲和后屈曲行为。通过在有限元模型中引入Tsai-Wu失效准则,预测了复合材料双曲率壳的初始失效及渐进破坏过程,数值结果和试验数据吻合较好,表明了该模型的合理有效性,并详细讨论了各种参数对屈曲和后屈曲行为的影响。经分析复合材料双曲率加筋壳在均布压载和剪力联合作用下的屈曲和后屈曲行为,得到了屈曲载荷的拟合曲线,研究表明顺剪力的存在有利于提高屈曲载荷。

According to the finite element package ABAQUS, the buckling and postbuckling response of the doubly -curved composite shell under transverse loads was obtained by using the nonlinear finite element method. A progressive failure model based on the Tsai-Wu failure criterion was introduced in the finite element procedure to predict the initial failure and the progressive failure process. The effect of geometric parameters on the buckling and postbuckling response has been discussed in detail. The buckling and postbuckling of doubly-curved composite shells with stiffeners subjected to combined loads were simulated. The results indicate that the shear load is helpful to the increase of the buckling loads.