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基于修正的Hahn Tsai非线性本构关系 ,用准三维有限单元法分析了材料非线性对对称角铺设复合材料层板分层屈曲、后屈曲以及能量释放率的影响 ,提出一种修正的反幂法计算材料非线性层板的临界载荷· 与不考虑材料非线性结果比较表明 :材料非线性使复合材料层板的屈曲载荷降低 ,降低幅度与分层长度和纤维铺设方向有关 ;能量释放率及其组分均有不同程度增加 ;后屈曲变形加快 ,裂尖层间应力奇异程度下降·
Based on the modified Hahn-Tsai nonlinear constitutive relationship, the effect of material nonlinearity on layered buckling, post-buckling and energy release rate of symmetrical-angle layered composite laminates was analyzed by quasi-3D finite element method. A modified inverse power Method to calculate the critical load of non-linear laminates · Comparing with the non-linear results without considering the material nonlinearity, the results show that the nonlinear buckling of the laminates reduces the buckling load, and the decreasing extent is related to the length of stratified layers and fiber lay-out. Its components are increased in varying degrees; post-buckling accelerated, singular degree of stress between the crack tip decreased