您目前所在的位置:首页 - 期刊简介 - 详细页面

铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 18    No. 5    October 2008

[PDF Download]    

    

Quasicontinuum simulation of indentation on FCC metals
WANG Hua-tao(王华滔), QIN Zhao-dong(秦昭栋), NI Yu-shan(倪玉山), ZHANG Wen(张 文)

Department of Mechanics and Engineering Science, Fudan University, Shanghai 200433, China

Abstract:Quasicontinuum simulations were performed to study the processes of incipient plastic deformation on three FCC metals (Ag, Ni and Pd) under the action of a rigid indenter. Four widths (9.3, 18.6, 27.9 and 37.2 Å) of the indenters were modelled for each metal specimen. A series of load—displacement responses and the strain energy versus displacement responses of the indenter were presented. It is shown that the abrupt drop of the load in the load—displacement response is triggered by the nucleation of dislocations in the metals. The critical load of each metal specimen increases with the increase of the indenter width, while the hardness of the metal specimen decreases as the indenter width increases. Furthermore, the microscopic mechanism of deformation in the films was analyzed. Two dislocations are nucleated respectively beneath the right and left sides of the indenter. Each dislocation successively decomposes into two Shockley partial dislocations after the first nucleation process. The distances between the two partial dislocations are equal for both sides of the indenter, which are in agreement with the theoretical values.

 

Key words: indentation; quasicontinuum method; dislocation; nucleation

ISSN 1672-7029
CN 43-1423/U

主管:中华人民共和国教育部 主办:中南大学 中国铁道学会 承办:中南大学
湘ICP备09001153号 版权所有:《铁道科学与工程学报》编辑部
------------------------------------------------------------------------------------------
地 址:湖南省长沙市韶山南路22号 邮编:410075
电 话:0731-82655133,82656174   传真:0731-82655133   电子邮箱:jrse@mail.csu.edu.cn