%0 Journal Article
%T Simulation Of Internal~ Stresses~ Near The Surface And Fatigue Crack Nucleation For A Copper Single Crystal In Cyclic Deformation Saturation Stage<br>铜单晶循环变形饱和阶段疲劳裂纹萌生及表面区域内应力分布的模拟
%A YANG Jihong
%A ZHANG Xinping
%A Y W MAI
%A LI Yong
%A <br>杨继红
%A 张新平
%A Y. W. Mai
%A 李勇
%J 金属学报
%D 2005
%I 
%X SEM-ECC technique was employed to observe and characterize the dislocation mi-crostructures during the saturation stage of cyclic deformations in a copper single crystal. Some band-like or spot-like dark zones were found in the dislocation microstructures, which located either at the edge region of the deformed specimen or at the interface between the dislocation matrix and the PSB. To interpret the experiment results, the near surface dislocation microstructure were simulated and the internal stress distributions induced by those dislocations were calculated by using discrete dislocation dynamics method. The simulation results show that near the free surface region, the maximum internal stresses or stress concentration appear at the dark zones which correspond to the interfaces between the PSB and the dislocation matrix or the PSB-matrix-surface interfaces, meaning that fatigue cracks initiate preferentially at these dark zones. The simulated results can well explain the observated ones.
%K copper single crystal
%K cyclic deformation
%K crack nucleation
%K discrete dislocation dynamics
%K internal stress distribution<br>Cu单晶
%K 循环变形
%K 疲劳裂纹萌生
%K 离散位错动力学
%K 内应力分布
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=AB188D3B70B071C57EB64E395D864ECE&jid=B061E1135F1CBDEE96CD96C109FEAD65&aid=CCFBF48FA6D5E44F&yid=2DD7160C83D0ACED&vid=2001E0D53B7B80EC&iid=CA4FD0336C81A37A&sid=9CF7A0430CBB2DFD&eid=F3583C8E78166B9E&journal_id=0412-1961&journal_name=金属学报&referenced_num=1&reference_num=20