碳纤维机织物增强热塑性树脂复合材料热冲压叠层模型

针对碳纤维增强热塑性树脂复合材料(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的现象,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成型性能的方法相比,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,并能优化热冲压成型工艺参数。这一叠层模型具有简单实用和材料参数容易确定的优点,为碳纤维机织物增强热塑性树脂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。

A lamination model for thermostamping of carbon woven fabric reinforced thermoplastic resin composites

The thermostamping process of carbon fiber reinforced thermoplastic resin composites (CFRTP)in-volves large deformation,anisotropy and multi-field coupling phenomenon.In order to characterize these mechanical behaviors of CFRTP,a lamination model combining thermoplastic resin and carbon woven fabric was established based on continuum mechanics and finite element method.Compared with the hyperelastic model of woven fabric, the proposed lamination model can simulate the condition of wrinkling visually at different forming temperatures, blank holder force and fiber orientation and optimize these process parameters in the thermostamping process.The proposed model is simple,useful and easy for material parameter determination.It provides a theoretical foundation for the numerical simulation and processing optimization of CFRTP forming.