Molecular Dynamics Study of Nanoscale Contact Process for Defective Monocrystalline Copper

摘要：

　　The research of nanoscale contact problem has important significance for the micro-nano machinery,especially for micro-nano contact problem of material defects,from which deformation and failure mechanism of materials could be revealed.Molecular dynamics method is a valid approach that describe microscopic phenomenon.Taking the rigid hemispherical surface contacted on and pressed in the perfect and defective monocrystalline copper as the research object,the molecular dynamics model of nanoscale contact was established,after solving and simulating analysis.Results showed that the substrates above the square void collapse at the contact depths of 0.20nm and 0.37nm when the depths of the square void (d) are 0.8nm and 1.6nm respectively.The dislocations and glide band increase as the d increases,at the same time,a bigger depth of square void results in a bigger contact force between the hemispherical surface and the substrate surface.In the process of disengagement,the contact force dropped suddenly and the unrecoverable plastic deformation of the copper material occurred.Moreover,the stress increases with the increase of the void depth.The stress mainly distributes in the diagonal of the square void,and the contact area generates stress concentration.

关键词： Molecular dynamics Contact Defects Nanoscale

作者: ZHAN Shengpeng YANG Xiaojing CHI Yilin

作者单位: Faculty of Modern Agricultural Engineering, Kunming University of Science and Technology,Kunming, 65 Faculty of Mechanical and electrical Engineering, Kunming University of Science and Technology,Kunmi

会议类型: 国际会议

会议名称: 中国微米纳米技术学会第14届学术年会、第3届国际年会暨第6届微米纳米技术“创新与产业化国际研讨与展览会(CSMNT2012 & ICMAN2012)

会议地点: 杭州

会议语种:英文

页码: 1-6

在线出版日期: 2012-11-04（万方平台首次上网日期，不代表论文的发表时间）