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在复合材料正交各向异性连续损伤力学的基础上,引入由应变描述的连续综合变量,损伤演化方案采用综合变量的指数函数。考虑复合材料剪切非线性,通过非线性损伤因子在全局损伤出现之前将其引入本构方程。编写了VUMAT实施损伤模型,介绍连续损伤模型中材料参数的取值方法。对无法通过试验获得的损伤参数,采用遗传算法原理,定义个体适应度为试验及模拟载荷-位移曲线误差,通过编写MATLAB程序调用ABAQUS有限元模型实施参数反演方法。选择了常用铺层结构的复合材料带孔层合板进行仿真参数识别分析,验证了基于遗传算法参数识别方法的可行性。
Based on the continuous damage mechanics of the orthotropic composite material, the continuous comprehensive variables described by the strain are introduced, and the damage evolution program adopts the exponential function of the synthetic variables. Considering the shear nonlinearity of composites, the nonlinear damage factors are introduced into the constitutive equation before the global damage occurs. The VUMAT implementation damage model was written, and the method of material parameter selection in the continuous damage model was introduced. For the damage parameters that can not be obtained through experiments, the genetic algorithm principle is used to define the individual fitness as the test and the simulation load-displacement curve error. The MATLAB program calls the ABAQUS finite element model to carry out the parameter inversion method. The composite perforated laminate with common ply structure was chosen to carry out simulation parameter identification analysis, which verified the feasibility of genetic algorithm based on parameter identification.