摘要
基于分子结构力学和多尺度方法,采用有限元商业软件ABAQUS,针对石墨烯存在的几种缺陷,构建了含有不同数量的双原子空缺缺陷和Stone-Wales(S-W)缺陷的石墨烯增强环氧树脂复合材料的有限元模型,研究了石墨烯的缺陷在不同石墨烯体积分数下对复合材料弹性模量以及界面层应力传递的影响。数值模拟结果表明,随着石墨烯体积分数的增加,完美石墨烯和缺陷石墨烯增强环氧树脂复合材料弹性模量均呈现线性上升。其次,缺陷种类和数量之间的结果对比表明,空缺缺陷会明显降低复合材料的弹性模量,且随着缺陷数量的增加,变化更明显。而S-W缺陷在一定程度上增加了复合材料的杨氏模量,对于剪切模量,则出现下降趋势。另外,界面层的应力传递一定程度上反映了缺陷对复合材料的影响。
Based on the molecular structural mechanics and multi-scale method,the finite element model of graphene reinforced epoxy resin composite with different number of vacancy defects and Stone-Wales(S-W)defects was constructed by using the finite element commercial software ABAQUS.The effects of graphene defects on the elastic modulus and interfacial stress transfer of composites with different volume fractions of graphene were investigated.The numerical simulation results show that the elastic modulus of the perfect graphene and the defective graphene reinforced epoxy resin composite increases linearly with the increase of the volume fraction of graphene.Secondly,the comparison between the number of defects and the type of defects shows that the vacancy defect can obviously reduce the modulus of elasticity of the composite,and the change is more obvious with the increase of the number of defects.However,the S-W defect increases the Young s modulus of the composites to a certain extent,but the shear modulus decreases.In addition,the stress transfer from the interface layer to some extent reflects the effect of defects on the composites.
作者
宋鲁彬
郭章新
李忠贵
栾云博
赵聃
张祺
SONG Lubin;GUO Zhangxin;LI Zhonggui;LUAN Yunbo;ZHAO Dan;ZHANG Qi(College of Mechanics,Shanxi Key Laboratory of Material Strength&Structure Impact, Taiyuan University of Technology,Taiyuan 030024,China;State Key Laboratory for Strength and Vibration of Mechanical Structures,Xi an Jiaotong University,Xi an 710049,China)
出处
《高压物理学报》
EI
CAS
CSCD
北大核心
2018年第6期38-47,共10页
Chinese Journal of High Pressure Physics
基金
国家自然科学基金(11602160
21501129
11502155)
山西省高等学校创新项目(2017117)
西安交通大学机械结构强度与振动国家重点实验室开放课题(SV2017-KF-01)
山西省自然科学青年基金(201601D021026)
山西省"1331工程"重点创新团队项目
关键词
石墨烯
缺陷
复合材料
力学性能
多尺度方法
graphene
defect
composites
mechanical properties
multi-scale method
