短切碳纤维增强尼龙复合材料力学性能及在电池箱上的应用

Performance of short carbon fiber reinforced nylon composite and it′s application in battery pack

针对短纤增强复合材料各向异性导致产品力学性能难以预测问题,本文研究了不同纤维含量的短切碳纤维增强尼龙复合材料(PA66CF)力学性能,开展了该材料应用于轻量化电池箱的仿真分析和性能评价。首先通过拉伸试验获取PA66CF材料的应力-应变曲线,然后导入Digimat中校正材料参数,并采用最大应变准则进行拉伸样件仿真验证仿真方法的准确性;将校正后的材料模型与失效准则应用于电池箱颠簸路面急停和急转弯工况的力学分析中,并与金属电池箱在最大位移、系统最大应力、箱体最大应力方面进行对比分析。研究表明,相比金属箱体,PA66CF材料箱体在质量减轻84%的同时,在上述两种工况下箱体最大应力减小了30%~50%,且碳纤维含量对电池箱最大位移影响较大。本文的研究可为PA66CF材料在电池箱上的应用提供参考。

It is difficult to predict the mechanical properties of short fiber reinforced composites which are used for battery pack lightweight due to anisotropy.This paper studies the mechanical properties of short carbon fiber reinforced nylon 66 composites(PA66CF)with different fiber contents.Furthermore,the simulation method and application effect of different fiber contents PA66CF applied to battery pack are studied.Firstly,the stress-strain curve of PA66CF were obtained through tensile experiments.Then the PA66 material parameters were corrected,and the tensile sample FE models using the criterion of maximum strain were established to verify the accuracy of the simulation process.Finally,the corrected material model and failure criterion were applied to the mechanical analysis of emergency braking and abrupt-turning on the bumpy road of the battery pack,and the maximum displacement,the maximum stress of the system and the maximum stress of the pack are compared with the metal battery pack.The results showed that compared with the metal pack,the mass of PA66CF packs were reduced by 84%,and the maximum stress of the PA66CF packs were reduced by 30%~50%under the above two conditions.Additionaly,the maximum displacement of battery pack could be affected by the carbon fiber content.The research in this paper provides simulation reference for the application of PA66CF material in battery pack.