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旨在建立能够正确预计复合材料圆柱壳的屈曲和后屈曲渐进破坏行为的模拟策略。采用有限元方法和Hashin失效准则进行模拟,基于该失效准则编写了用户材料子程序,然后插入到商用有限元软件ABAQUS中。分析了中心受横向集中载荷作用复合材料圆柱壳板,壳板的2条直边弹性支持,2条曲边自由。为了探讨弹性边界条件和集中载荷作用点应力集中的影响,将有限元分析结果与文献中的试验结果进行了比较,提出了一种合理的弹性边界选取依据。研究结果表明,在建模中考虑了弹性边界和集中载荷作用点处存在的应力集中后,本文中模拟的结果与文献中的试验结果比较接近,模拟精度明显高于文献中报道的结果。这也验证了本文中建立的模拟策略的合理性。
The aim is to establish a simulation strategy that can correctly predict the progressive buckling and postbuckling behavior of composite cylindrical shells. The finite element method and the Hashin failure criterion were used to simulate. Based on this failure criterion, a user material subroutine was written and then inserted into the commercial finite element software ABAQUS. The center is supported by two straight edges of the composite cylindrical shell plate and shell plate with lateral concentrated load. The two curved edges are free. In order to investigate the influence of elastic boundary conditions and stress concentration on concentrated load, the results of finite element analysis are compared with the experimental results in the literature, and a reasonable basis of elastic boundary selection is proposed. The results show that the simulation results in this paper are close to those in the literature, and the simulation accuracy is obviously higher than the results reported in the literature after considering the stress concentration existing at the elastic boundary and the point of concentrated load. This also verifies the rationality of the simulation strategy established in this paper.