MECHANICAL BEHAVIOR OF FCC CRYSTAL SIMULATED BY 3-D DISCRETE DISLOCATION DYNAMICS

金属学报(英文版), 2008, 21(2): 94-102.

^1, , ^2, , ^3,

1.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China;Institute of Structural Mechanics, China Academy of Engineering Physics, Mianyang 621900, China

2.Institute of Structural Mechanics, China Academy of Engineering Physics, Mianyang 621900, China

3.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China

基金项目: the China Academy of Engineering Physics Foundation(2007B04004)

MECHANICAL BEHAVIOR OF FCC CRYSTAL SIMULATED BY 3-D DISCRETE DISLOCATION DYNAMICS

Y. Yu ^1, , X.X. Pan ^2, , Y.H. Rong ^3,

1.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China;Institute of Structural Mechanics, China Academy of Engineering Physics, Mianyang 621900, China

2.Institute of Structural Mechanics, China Academy of Engineering Physics, Mianyang 621900, China

3.School of Materials Science and Engineering, Shanghai Jiaotong University, Shanghai 200030, China

Keywords： FCC crystal

To simulate the mechanical behavior of the FCC crystal with the lower Peierls stress, the stiff property and physical meaning of the differential equation group consisting of dislocation evolution and mechanical state was investigated based on the 3-D discrete dislocation dynamics; the results indicate that the differential equation group is serious stiff, namely the external stress changes more quickly than dislocation evolution.Using the established numerical algorithm, the mechanical behavior of FCC crystal was simulated with the dislocations located in the parallel slip planes, and the effect of strain rate on the dislocation configuration and mechanical behavior, and the saturation process of mobile dislocation were discussed. The simulation results indicate that the numerical algorithm can efficiently simulate the dislocation dipole and the low strain rate loading.

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MECHANICAL BEHAVIOR OF FCC CRYSTAL SIMULATED BY 3-D DISCRETE DISLOCATION DYNAMICS

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