短切碳纤维/乙烯基酯树脂片状模塑料拉伸性能的有限元模拟

Finite element simulation of tensile properties of chopped carbon fiber/vinyl ester resin sheet molding compounds

采用Python语言对ABAQUS软件进行二次开发,生成了短切碳纤维在乙烯基酯树脂中随机分布的二维平面应变模型,建立代表性体积单元(RVE),通过Hypermesh对模型进行网格划分,为保证RVE应力场的均匀协调性,在周期性边界条件下,对短切碳纤维/乙烯基树脂进行拉伸性能数值模拟计算分析,并结合实验研究了短切碳纤维长度对片状模塑料拉伸性能的影响。结果验证了对短切碳纤维/乙烯基树脂片状模塑料拉伸模量随纤维长度的增大出现先增大后变缓的趋势,表明利用Python-ABAQUS建立二维平面应变RVE模型的合理性。本研究为短切碳纤维/乙烯基树脂片状模塑料在汽车轻量化行业的应用提供了理论及实验依据。

Python language was used to redevelop ABAQUS to generate 2 Dplane strain model with randomly distributed chopped carbon fibers.The representative volume element(RVE)was created and meshed with Hypermesh.In order to ensure the uniform coordination of the stress field of the RVE,the numerical simulation analysis of the tensile properties was under periodic boundary conditions,and the change trend of the effect of fiber length on the elastic modulus of the sheet molding compound was studied.The results verify that the tensile modulus of chopped carbon fiber/vinyl ester resin sheet molding compounds increases first and then decreases gradually with the increase of fiber length,and it is right to use Python-ABAQUS to establish a 2 Dplane strain RVE model.This study provides theoretical and experimental basis for the application of sheet molding compound in the automotive lightmass industry.