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Chinese Journal of High Pressure Physics  > 2007  >  21(2): 136-144 .
ZHANG Yue-Ju, LI Xiao-Jie, YAN Hong-Hao, QU Yan-Dong, TAO Yu-Xiong. Research of Fragmentation of Nano-Ceramic Powders during Explosive Consolidation Process[J]. Chinese Journal of High Pressure Physics, 2007, 21(2): 136-144 . doi: 10.11858/gywlxb.2007.02.004
Citation: ZHANG Yue-Ju, LI Xiao-Jie, YAN Hong-Hao, QU Yan-Dong, TAO Yu-Xiong. Research of Fragmentation of Nano-Ceramic Powders during Explosive Consolidation Process[J]. Chinese Journal of High Pressure Physics, 2007, 21(2): 136-144 . doi: 10.11858/gywlxb.2007.02.004
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Research of Fragmentation of Nano-Ceramic Powders during Explosive Consolidation Process

doi: 10.11858/gywlxb.2007.02.004

  • State Key Laboratory of Structural Analysis for Industrial Equipment, Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024, China

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  • Corresponding author: ZHANG Yue-Ju
  • Received Date: 16 Jul 2006
  • Rev Recd Date: 13 Oct 2006
  • Issue Publish Date: 05 Jun 2007
    Abstract
  • In explosive consolidation of nano-powders, the duration in which the loading changed markedly on nano-particles by shock wave is far longer than the time of stress wave propagating through the character length of the particles; and the ceramic powders behave brittleness during explosive shock consolidation. The elastic hypothesis is put forward based on the two facts mentioned above, and the hypothesis is used to deduce the stress status in particles during the process of consolidation. The three criteria of brittleness fracture of damage (Hugonoit elastic limit, dynamic yield strength and theoretical shear strength) are reviewed. The probability of fracture of ceramic particles is estimated by the intersection value of the three criteria. Based on the calculation, it is concluded that there are two maximal shear positions: one is located in the depth of 0.5 nm in particle from the contact surface, where the shear stress is maximum;the other is located further from the surface. This result offers a reference for interpreting the plasticity and fracture during the process of explosive consolidation.

     

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