Preliminary Investigation on Stress Distribution Mechanism of Shock Propagating across Grain Interface in Metal

WANG Xuan; HUANG Shenghong; ZHANG Yongliang

doi:10.11858/gywlxb.20180608

Volume 33 Issue 5

Sep 2019

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Chinese Journal of High Pressure Physics > 2019 > 33(5): 052201.

WANG Xuan, HUANG Shenghong, ZHANG Yongliang. Preliminary Investigation on Stress Distribution Mechanism of Shock Propagating across Grain Interface in Metal[J]. Chinese Journal of High Pressure Physics, 2019, 33(5): 052201. doi: 10.11858/gywlxb.20180608

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WANG Xuan, HUANG Shenghong, ZHANG Yongliang. Preliminary Investigation on Stress Distribution Mechanism of Shock Propagating across Grain Interface in Metal[J]. Chinese Journal of High Pressure Physics, 2019, 33(5): 052201. doi: 10.11858/gywlxb.20180608

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Preliminary Investigation on Stress Distribution Mechanism of Shock Propagating across Grain Interface in Metal

doi: 10.11858/gywlxb.20180608

CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230026, China

Received Date: 31 Jul 2018
Rev Recd Date: 28 Sep 2018

Abstract

Abstract

To know the stress distribution mechanism of shock propagating across grain interface is of great significance to understand the interacting phenomena and plastic principles of shock and polycrystalline metal material. With molecular dynamics (MD), shock impacting on four kinds of metals with FCC (face-centered cubic) crystal lattice are numerically simulated. The stress tensor components distribution, scale and correlations of shock propagating in monocrystal and across grain interface on {100} lattice plane are computed and analyzed. It is concluded as follows: (1) The stress generated after shock propagating along different lattice arrangement orientations presents different characteristics between parallel and perpendicular shock direction, which is in accordance with force interaction difference due to the lattice arrangement and interaction mechanism between atoms. The results of such difference are corresponding to the plasticity variation with lattice orientations. (2) An independent tensor is found to be in charge of stress distribution in elastic shock propagating across a single grain interface. This tensor has uniform style and similar coefficients for different materials with the same lattice arrangement, presenting a kind of generality. (3) The coherent predictability and accuracy of stress distribution tensor for FCC lattice are validated by simulation results for shock impacting on a single grain interfaces at different velocities and lattice arrangement orientations, indicating the intrinsic property of the interaction between shock and lattice atoms.
- polycrystalline metal,
- shock wave,
- grain interface,
- face-centered cubic,
- stress,
- molecular dynamics

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References(44)

References

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Preliminary Investigation on Stress Distribution Mechanism of Shock Propagating across Grain Interface in Metal

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