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针对碳纤维增强热塑性复合材料(CFRTP)在热冲压成型过程中涉及到大变形、各向异性和多场耦合现象,为了表征CFRTP在成型中的力学特征,基于有限元方法与连续介质力学理论提出了一种热塑性树脂基体与碳纤维机织物的叠层模型。与单独采用碳纤维机织物超弹性本构模型预测CFRTP成型性能的方式相比,提出的叠层模型能够表征成型温度、压边力和纤维取向对CFRTP成型缺陷的影响,并能优化这些热冲压成型工艺参数。这一叠层模型具有简单实用、材料参数容易确定的优点,为机织碳纤维增强热塑性复合材料成型的数值模拟和成型工艺优化奠定了理论基础。
In order to characterize the mechanical characteristics of CFRTP in forming, CFRTP is involved in large deformation, anisotropy and multi-field coupling during hot stamping. Based on the finite element method and continuum mechanics theory, A laminated model of a thermoplastic resin matrix and a carbon fiber woven fabric. Compared with the method of predicting the CFRTP forming performance by using the carbon fiber woven superelastic constitutive model alone, the proposed laminating model can characterize the influence of forming temperature, blank holder force and fiber orientation on CFRTP forming defects, and can optimize the hot stamping forming Process parameters. The laminated model has the advantages of simple and practical, easy to determine the material parameters, and provides the theoretical basis for the numerical simulation and molding process optimization of the woven carbon fiber reinforced thermoplastic composites.