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Chinese Journal of High Pressure Physics  > 2006  >  20(2): 127-132 .
WANG Yong-Gang, HE Hong-Liang, WANG Li-Li, JING Fu-Qian. Percolation Description for the Early Stage of Void Coalescence during Dynamic Tensile Fracture in Ductile Materials[J]. Chinese Journal of High Pressure Physics, 2006, 20(2): 127-132 . doi: 10.11858/gywlxb.2006.02.003
Citation: WANG Yong-Gang, HE Hong-Liang, WANG Li-Li, JING Fu-Qian. Percolation Description for the Early Stage of Void Coalescence during Dynamic Tensile Fracture in Ductile Materials[J]. Chinese Journal of High Pressure Physics, 2006, 20(2): 127-132 . doi: 10.11858/gywlxb.2006.02.003
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Percolation Description for the Early Stage of Void Coalescence during Dynamic Tensile Fracture in Ductile Materials

doi: 10.11858/gywlxb.2006.02.003
  • 1.

    Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Mianyang 621900, China;

  • 2.

    Mechanics and Materials Science Research Center, Ningbo University, Ningbo 315211, China

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  • Corresponding author: HE Hong-Liang
  • Received Date: 23 Mar 2005
  • Rev Recd Date: 30 Jun 2005
  • Publish Date: 05 Jun 2006
    Abstract
  • Based on the frame of percolation theory, a new stress release function named as Percolation Release (PR) function has been proposed to describe the course of stress release during the early stage of void coalescence until the final or catastrophic fracture occurring. A clearly physical meaning is given for Dc0, the critical damage for the initiation of void coalescence, and Df, the fracture critical damage. Coupled with damage function model proposed previously, PR function is applied to simulate the spall behaviors of OFHC copper and 45 steel as examples. Compared with the experimental measurements, numerical results indicate that the calculated stress profile and free surface velocity profile as well as the damage distribution in the materials being studied are consistent well with the experiments, and PR function has a good ability for describing the stress release just before the catastrophic fracture occurs.

     

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    • References(21)
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