铺层方式对VIHPS制备的GO-CF混杂增强复合材料弯曲性能的影响

Effects of Lay-up Methods on the Flexural Properties of GO-CF Hybrid Reinforced Composites Prepared by VIHPS

本文首先采用真空浸渗热压工艺(VIHPS)制备了不同铺层方式的氧化石墨烯-碳纤维(GO-CF)混杂增强复合材料,并对该材料进行三点弯曲试验,再通过扫描电子显微镜(SEM)表征其微观断口形貌。然后使用Digmat软件的FE模块建立微-纳跨尺度的代表性体积单元(RVE)模型,将该模型导入ANSYS Workbench软件中进行三点弯曲仿真模拟。复合材料三点弯曲试验结果表明,随着沿试样宽度方向(Y向)纤维铺层的增加,复合材料的弯曲强度从433.2 MPa降低至12.7 MPa,弯曲模量从13.8 GPa降低至0.2 GPa,它们分别降低了97.07%和98.55%。最后通过对比试验与仿真结果发现,两种结果的变化趋势基本一致,且仿真结果与试验结果接近。复合材料在弯曲变形过程中,受到拉伸和压缩的共同作用,其中导致复合材料失效的方式主要包括基体开裂、界面脱粘和纤维断裂。

The present study first prepared graphene oxide-carbon fiber(GO-CF)hybrid reinforced composites with different lay-up methods using vacuum infiltration hot pressing system(VIHPS),and conducted three-point bending tests on the material,followed by characterization of its microfracture morphology using scanning electron microscopy(SEM).Subsequently,a micro-nano multiscale representative volume element(RVE)model was established using the FE module of Digimat software,and the model was imported into ANSYS Workbench software for three-point bending simulation.The results of the composites three-point bending test show that with the increase of fiber layup along the sample width direction(Y direction),the bending strength of the composites decreased from 433.2 MPa to 12.7 MPa,and the bending modulus decreased from 13.8 GPa to 0.2 GPa,decreasing by 97.07%and 98.55%,respectively.Finally,by comparing the experimental and simulation results,it was found that both trends were basically consistent,and the simulation results were close to the experimental results.During the bending deformation process of the composites,it is subjected to the combined actions of tension and compression,with the main damage modes including matrix cracking,interface debonding,and fiber fracture.