基于ANSYS的多尺度GO-CF/EP复合材料弯曲性能仿真及试验验证

Simulation and Experimental Verification of Multi-scale GO-CF/EP Composites Based on ANSYS

石墨烯碳纤维混杂增强树脂基(GO-CF/EP)复合材料以其低密度和优异的力学性能等引起了科学界越来越广泛的关注。本文采用DIGIMAT软件对真空浸渗热压成型试验系统工艺(VIHPS)制备的GO-CF/EP复合材料建立代表性体积单元(RVE),然后再利用ANSYS软件构建GO-CF/EP三点弯曲有限元RVE模型,并结合有限元仿真与试验结果来验证该模型的有效性,最后探究石墨烯(GO)含量对GO-CF/EP复合材料弯曲性能的影响。其中通过ANSYS仿真模拟得到的应力云图和弯曲强度数值,表明GO-CF/EP复合材料的微观组分比例会影响宏材料观力学性能,GO含量从0.00%增至0.50%,GO-CF/EP复合材料的弯曲强度提高了54.26%。再结合试验结果进行对比,发现通过ANSYS软件对GO-CF/EP复合材料的弯曲强度进行模拟得到的值较为准确,其中试验结果与软件模拟结果误差小于10%。因此ANSYS仿真结果可以用来预测GO-CF/EP复合材料的弯曲性能;此外还可以通过增强CF/基体的界面性能、增强基体的强度并在基体内部形成网状结构来提高GO-CF/EP复合材料的整体结构性能。

Graphene-carbon fiber hybrid reinforced resin matrix(GO-CF/EP)composites have attracted more and more attention from the scientific community for their low density and excellent mechanical properties.In this paper,the representative volume element(RVE)of GO-CF/EP composites prepared by vacuum infiltration hot press molding pilot system process(VIHPS)is established by using DIGIMAT software,and then the three-point bending finite element RVE model of GO-CF/EP is constructed by using ANSYS software,which is combined with the finite element simulation and experimental results to validate the validity of the model,and then finally the effect of the graphene(GO)content on the bending properties of GO-CF/EP composites.Among them,the stress maps and bending strength values obtained through ANSYS simulation show that the ratio of GO-CF/EP Composites microscopic components affects the macroscopic mechanical properties,and the bending strength of GO-CF/EP composites is increased by 54.26%when the GO content is increased from 0.00%to 0.50%.Compare this with the results of the test,it was found that the values obtained by simulating the flexural strength of GO-CF/EP composites through ANSYS software were more accurate,and the error between the test results and the software simulation results is less than 10%.Therefore,the ANSYS simulation results can be used to predict the flexural properties of GO-CF/EP composites,and GO can improve the overall structural properties of GO-CF/EP composites by enhancing the interfacial properties of CF/matrix,strengthening the matrix and forming a mesh structure inside the matrix.