Simulation Of Internal~ Stresses~ Near The Surface And Fatigue Crack Nucleation For A Copper Single Crystal In Cyclic Deformation Saturation Stage
YANG Jihong; ZHANG Xinping; Y. W. MAI; LI Yong
College of Physics and Technology; Shenyang Normal University; Shenyang 110034
Cite this article:
YANG Jihong; ZHANG Xinping; Y. W. MAI; LI Yong. Simulation Of Internal~ Stresses~ Near The Surface And Fatigue Crack Nucleation For A Copper Single Crystal In Cyclic Deformation Saturation Stage. Acta Metall Sin, 2005, 41(1): 9-.
Abstract SEM--ECC
technique was employed to observe and characterize the dislocation
microstructures 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.
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LI Xiaowu; WANG Zhongguang;LI Shouxin (State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academyof Sciences; Shenyang 110015)Correspondent: LI Xiaowu; Tel: (024)23843531-55925; Fax: (024)23891320;E-mail: rwli imr.ac. cn. CYCLIC STRAIN HARDENING AND SATURATION OF [■12]DOUBLE-SLIP-ORIENTED COPPER SINGLE CRYSTALS[J]. 金属学报, 1998, 34(8): 864-869.
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ZHANG Zhefeng; WANG Zhongguang; SU Huihe(State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110015)Correspondent: ZHANG Zhefeng Tel: (024)23843531-55225; Fax: (024)23891320. CYCLIC DEFORMATION BEHAVIOR OF A COPPER BICRYSTAL WITH A PERPENDICULAR GRAIN BOUNDARY[J]. 金属学报, 1998, 34(8): 841-846.
LI Xiaowu; WANG Zhongguang; SUN Shouguang; WU Shiding;LI Shouxin;LI Guangyi (State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; The Chinese Academy of Sciences; Shenyang 110015)(Department of Mechanical Engineering; Northern Jiaotong University; Beijing 100044). CYCLIC DEFORMATION BEHAVIOR OF [011] MULTIPLE-SLIP-ORIENTED COPPER SINGLE CRYSTALSCyclic Stress-Strain Response[J]. 金属学报, 1998, 34(5): 545-551.
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I. Cyclic Deformation Behavior and Slip Morphology HU Yunming; WANG Zhongguang (State Key Laboratory for Fatigue and Fracture of Materials; Institute of Metal Research; Chinese Academy ofSciences; Shenyang 110015) (Manuscript received 1996-09- 12; in revised form 1997-03-07). CYCLIC DEFORMATION BEHAVIOR AND FATIGUE CRACK INIT1ATION IN COPPER BICRYSTALS[J]. 金属学报, 1997, 33(8): 814-823.
