石墨烯增强层对石墨烯/Al复合材料不同压缩阶段的强化影响  

Effect of graphene reinforcement on strengthening of grapheme/Al composites at different compression stages

作　　者：颜建伟 程超 金超奇 谭鑫 朱兆铭 YAN Jianwei;CHENG Chao;JIN Chaoqi;TAN Xin;ZHU Zhaoming(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;State Key Laboratory of Performance Monitoring and Protecting of Rail Transit Infrastructure,East China Jiaotong University,Nanchang 330013,China)

机构地区：[1]华东交通大学土木建筑学院,南昌330013 [2]华东交通大学轨道交通基础设施性能监测与保障国家重点实验室,南昌330013

出　　处：《复合材料学报》2023年第6期3662-3672,共11页Acta Materiae Compositae Sinica

基　　金：国家自然科学基金(12072112);江西省杰出青年科学基金(20202 ACBL214014)。

摘　　要：利用分子动力学(MD)方法探究了石墨烯纳米片(GNs)层数和每层片数对GNs/Al复合材料不同压缩阶段力学增强效果的影响。结果发现:GNs层和片数越多,复合材料弹性模量、屈服强度和最大应力强度的增强效果越显著,且增强层由3片及以上GNs构成时,压缩曲线会出现双最大应力峰值。压缩后期,GNs的断裂造成复合材料的各向异性,使复合材料在GNs锯齿形方向上的横向变形大于扶手椅方向。与MD结果对比分析发现,当金属层厚不足3 nm时,限制层滑模型不再适用。Molecular dynamics(MD)method was used to investigate the effect of the number of graphene nanosheets(GNs)layers and the number of sheets in each layer on the mechanical reinforcement of GNs/Al composite at different compression stages.The results show that the increase of GNs layers and the number of GNs sheets increases the enhancement effect of elastic modulus,yield strength and maximum stress strength of the composite.When the reinforcement layer is composed of 3 or more GNs sheets,double maximum stress peaks appear in the compression curve.At the late compression stage,the fracture of GNs results in the anisotropy of the composite,and the transverse deformation of the composite in the zigzag direction of GNs is larger than that in the armchair direction.When the thickness of metal layer is less than 3 nm,the confined layer slip model is not applicable.

关 键 词：分子动力学 石墨烯/Al复合材料 压缩阶段 位错结构 限制层滑模型 

分 类 号：TB331[一般工业技术—材料科学与工程]