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Analysis of Steady-State Penetration in Viscoplastic Porous Materials

[+] Author Affiliations
Oana Cazacu, N. D. Cristescu

University of Florida

Paper No. IMECE2004-61221, pp. 367-370; 4 pages
doi:10.1115/IMECE2004-61221
From:
  • ASME 2004 International Mechanical Engineering Congress and Exposition
  • Applied Mechanics
  • Anaheim, California, USA, November 13 – 19, 2004
  • Conference Sponsors: Applied Mechanics Division
  • ISBN: 0-7918-4702-0 | eISBN: 0-7918-4178-2, 0-7918-4179-0, 0-7918-4180-4
  • Copyright © 2004 by ASME

abstract

A study of the steady-state motion of a porous medium over a rigid wedge-shaped penetrator was conducted. In order to describe the combined effects of strain rate and compaction on yielding, a rigid viscoplastic constitutive equation was used. The deviatoric response was modeled with a non-homogeneous Bingam type equation with shear yield limit dependent on the current density. The system of partial differential equations consisting of the constitutive equation, the continuity equation, and the balance of momentum was solved for different interface conditions. The resistance to penetration as a function of the striking velocity, target properties (density dependent yield, locking pressure, locking density), friction coefficient as well as wedge semi-angle was obtained. The wedge semi- angle corresponding to a minimum in resistance to penetration in mortar for various impact conditions also resulted from this investigation.

Copyright © 2004 by ASME

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