基于Digimat RVE的碳纤维增强聚丙烯复合材料性能分析

Properties Analysis of Carbon Fiber Reinforced Polypropylene Composites based on Digimat-RVE

采用Digimat软件包对造纸/热压模塑法制备的碳纤维增强聚丙烯(CF/PP)复合材料建立等效体积单元(RVE),研究了碳纤维含量、碳纤维长径比和基体中碳纤维取向对CF/PP复合材料力学性能、导热性能和导电性能的影响。模拟实验结果表明,碳纤维含量从5 wt%增至30 wt%,CF/PP复合材料弹性模量和电导率分别提高290%和750%;碳纤维长径比从100提高至700,CF/PP复合材料电导率提高了约54倍;碳纤维取向张量的变化对CF/PP复合材料RVE的弹性模量和导热系数的影响可以忽略不计。Digimat软件对CF/PP复合材料导热系数的模拟值较精确,在100℃下测量的导热系数实验结果与软件模拟结果误差为0.48%。

The Digimat software package was used to build representative volume element(RVE)for carbon fiber reinforced polypropylene(CF/PP)composites prepared by papermaking/hot press moulding and the influence of the carbon fiber content,aspect ratio,and fiber orien⁃tation in the matrix on the mechanical properties,thermal conductivity,and electrical conductivity of the CF/PP composites was investigated.The simulation results showed that the composite elastic modulus and electrical conductivity increased by 290%and 750%,respectively as carbon fiber content increased from 5 wt%to 30 wt%.Electrical conductivity of the CF/PP composites increased by around 54 times when the aspect ratio of carbon fibers rose from 100 to 700.The fiber orientation tensor had negligible effect on the elastic modulus and thermal conduc⁃tivity of the CF/PP composites.When comparing the experimental results and the simulation results under test condition of 100℃,the error of thermal conductivity was 0.48%,indicating that the simulation results from Digimat software package was highly accurate.