摘要
界面能密度是表征纳米复合材料与结构界面力学性质的重要物理量.采用分子动力学方法计算了不同面心立方金属晶体构成的双材料纳米薄板结构的界面能密度,分析了界面晶格结构形貌变化及界面效应对原子势能的影响.结果表明:双材料纳米薄板界面具有周期性褶皱状疏密相间的晶格结构形貌,界面上原子势能亦呈现周期性分布特性,而靠近界面的两侧原子势能与板内原子势能具有明显差异.拉格朗日界面能密度和欧拉界面能密度均随双层薄板厚度的增加而增加,最终趋向于块体双材料结构的界面能密度.
The interface free energy density is an important quantity characterizing the mechanical property of interfacein nanocomposite systems.In this paper,molecular dynamics simulation method is adopted to investigate the interfaceenergy density of di erent FCC metallic bi-nano-scaled plates.The morphology of the interface crystal structure and theinterface e ect on the atomic potential are analyzed.It is found that interface atoms have periodically wrinkled rarefiedor serried configurations,and the potential energy of interface atoms is also periodically distributed.The potential energyof atoms near the interface is obviously di erent from that of atoms inside the nano-plates.Both the Lagrange interfaceenergy and the Eulerian one increase with the increase of the thickness of the bi-material,which approach the interfaceenergy of a bulk bi-material finally.
作者
王帅
姚寅
杨亚政
陈少华
Wang Shuai;Yao Yin;Yang Yazheng;Chen Shaohua(LNM,Institute of Mechanics,Chinese Academy of Sciences,Beijing 100190,China;Institute of Advanced Structure Technology,Beijing Key Laboratory of Lightweight Multi-functional Composite Materials and Structures,Beijing Institute of Technology,Beijing 100081,China;Collaborative Innovation Center of Electric Vehicles in Beijing, Beijing Institute of Technology,Beijing 100081,China;School of Engineering Sciences,University of Chinese Academy of Sciences,Beijing 100049,China)
出处
《力学学报》
EI
CSCD
北大核心
2017年第5期978-984,共7页
Chinese Journal of Theoretical and Applied Mechanics
基金
国家自然科学基金(11372317
11532013
11402270)
北京理工大学科研创新计划资助项目
关键词
双材料金属界面
分子动力学
界面能密度
尺寸效应
界面形貌
metallic bi-material interface
molecular dynamics
interface energy density
size effect
interface morphology
