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针对复合材料厚板强度分析问题,通过对子层压板的刚度等效和应力/应变分解建立了一种多尺度分析模型,并引入了剪切非线性本构关系。实现了复合材料厚板结构在子层压板水平的有限元计算和铺层水平的失效判断。采用FORTRAN语言编写了适用于Abaqus/Explicit求解器的VUMAT子程序,用于模拟复合材料厚板剪切非线性响应以及面内失效,子层压板之间采用内聚力模型来模拟分层损伤。分别采用多尺度线性模型和非线性模型对厚层压板G_(13)剪切试验进行了数值预测,并与试验结果进行了对比。分析结果表明:线性计算模型在预测结构承载能力方面有较高的精度,但在预测整体载荷-位移响应时与试验值偏差较大;由多尺度非线性计算模型得到的破坏模式以及载荷-位移曲线均与试验结果吻合较好。
Aiming at the problem of the strength analysis of composite slab, a multi-scale analysis model is established by means of stiffness equivalent and stress / strain decomposition of the sub-laminate, and the shear nonlinear constitutive relationship is introduced. The finite element calculation of composite slab structure at sub-laminate level and the failure judgment of ply level are realized. The VUMAT subroutine for Abaqus / Explicit solver was written in FORTRAN language to simulate the shear nonlinear response and in-plane failure of composite slab, and the cohesion model was used to simulate delamination damage between sub-laminates. The multi-scale linear model and non-linear model were respectively used to predict the numerical value of G 13 shear laminates. The results were compared with the experimental results. The analysis results show that the linear calculation model has higher accuracy in predicting the bearing capacity of the structure, but deviates from the experimental value in predicting the overall load-displacement response. The failure mode obtained by the multi-scale nonlinear calculation model and the load-displacement The curves are in good agreement with the experimental results.