Applied Mathematics and Mechanics (English Edition) ›› 2014, Vol. 35 ›› Issue (8): 1039-1050.doi: https://doi.org/10.1007/s10483-014-1842-7

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Analytical solutions for finite cylindrical dynamic cavity expansion in compressible elastic-plastic materials

甄明, 蒋志刚, 宋殿义, 刘飞   

  1. College of Basic Education, National University of Defense Technology, Changsha 410073, P. R. China
  • 收稿日期:2013-07-10 修回日期:2013-11-14 出版日期:2014-08-01 发布日期:2014-08-01
  • 通讯作者: Zhi-gang JIANG, Professor, Ph.D., E-mail: 13508489165@163.com E-mail:13508489165@163.com
  • 基金资助:
    Project supported by the Research Project of National University of Defense Technology (No. S130901)

Analytical solutions for finite cylindrical dynamic cavity expansion in compressible elastic-plastic materials

Ming ZHEN, Zhi-gang JIANG, Dian-yi SONG, Fei LIU   

  1. College of Basic Education, National University of Defense Technology, Changsha 410073, P. R. China
  • Received:2013-07-10 Revised:2013-11-14 Online:2014-08-01 Published:2014-08-01
  • Supported by:
    Project supported by the Research Project of National University of Defense Technology (No. S130901)

摘要: Analytical solutions for the dynamic cylindrical cavity expansion in a compressible elastic-plastic cylinder with a finite radius are developed by taking into account of the effect of lateral free boundary, which are different from the traditional cavity expansion models for targets with infinite dimensions. The finite cylindrical cavity expansion process begins with an elastic-plastic stage followed by a plastic stage. The elastic-plastic stage ends and the plastic stage starts when the plastic wave front reaches the lateral free boundary. Approximate solutions of radial stress on cavity wall are derived by using the Von-Mise yield criterion and Forrestal's similarity transformation method. The effects of the lateral free boundary and finite radius on the radial stress on the cavity wall are discussed, and comparisons are also conducted with the finite cylindrical cavity expansion in incompressible elastic-plastic materials. Numerical results show that the lateral free boundary has significant influence on the cavity expansion process and the radial stress on the cavity wall of metal cylinder with a finite radius.

关键词: penetration, cavity expansion, metal target, free boundary, radial stress

Abstract: Analytical solutions for the dynamic cylindrical cavity expansion in a compressible elastic-plastic cylinder with a finite radius are developed by taking into account of the effect of lateral free boundary, which are different from the traditional cavity expansion models for targets with infinite dimensions. The finite cylindrical cavity expansion process begins with an elastic-plastic stage followed by a plastic stage. The elastic-plastic stage ends and the plastic stage starts when the plastic wave front reaches the lateral free boundary. Approximate solutions of radial stress on cavity wall are derived by using the Von-Mise yield criterion and Forrestal's similarity transformation method. The effects of the lateral free boundary and finite radius on the radial stress on the cavity wall are discussed, and comparisons are also conducted with the finite cylindrical cavity expansion in incompressible elastic-plastic materials. Numerical results show that the lateral free boundary has significant influence on the cavity expansion process and the radial stress on the cavity wall of metal cylinder with a finite radius.

Key words: penetration, cavity expansion, metal target, free boundary, radial stress

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