Tong, W. and Ravichandran, G. (1993) Dynamic pore collapse in viscoplastic materials. Journal of Applied Physics, 74 (4). pp. 2425-2435. ISSN 0021-8979. http://resolver.caltech.edu/CaltechAUTHORS:TONjap93
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Dynamic pore collapse in porous materials is studied by analyzing the finite deformation of an elastic/viscoplastic spherical shell under impulsive pressure loading. Effects of dynamic loading rate, pore size, initial porosity, strain-i-ate sensitivity, strain hardening, thermal softening, and mass density of the matrix material on the pore collapse process are examined and results are compared with those from quasistatic analyses of both rate-independent and rate-dependent matrix materials. Dynamic (inertia) effects are found to be significant or even dominant in certain shock wave consolidation conditions. An approximate method is proposed to incorporate dynamic effects into quasistatic pore-collapse relations of viscoplastic matrix materials. Implications of results of current study are discussed in terms of understanding the processes of shock wave consolidation of powders.
|Additional Information:||Copyright © 1993 American Institute of Physics. Received 23 January 1993; accepted for publication 29 April 1993. The authors would like to acknowledge the support of this research by the Division of Materials Research of the National Science Foundation through Grant No. DMR-9116570. G.R. acknowledges the support of a NSF Presidential Young Investigator award, Grant No. MSS-9157846. Discussions with Professor T. Vreeland, Jr. and Professor T. Christman on shock wave consolidation are gratefully acknowledged. The computations were performed on a Cray Y-MP at the San Diego Supercomputer Center (SDSC).|
|Subject Keywords:||POROUS MATERIALS; VISCOPLASTICITY; SHELLS; LOADING; PRESSURE EFFECTS; SHOCK WAVES; MATRIX MATERIALS; VERY HIGH PRESSURE; POWDERS|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||09 May 2006|
|Last Modified:||26 Dec 2012 08:51|
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