A mesomechanical model for void coalescence
Abstract
The failure of ductile metals under dynamic tensile loads typically occurs via the nucleation, growth, and coalescence of many (up to 10^7/cm^3) microcopic voids. Experimental data from post test examination of sectioned samples from flat plate impact experiments [see, for example, Ref. 1] suggest that coalescence may occur by void impingement, shear localization between growing voids, or some other mechanism. To gain more understanding of the void coalescence process, we extended our prior mesomechanical DFRACT model [1] for the nucleation and growth of ductile voids, drawing on old and new data from both the experimental and computational community. The model has as input the size distribution of the heterogeneities that serve as void nucleation sites, as well as an adjustable parameter to account for different void coalescence mechanisms. We report the results of parametric studies to investigate the influence of these input parameters on void coalescence morphology. 1. D. R. Curran, L. Seaman, and D. A. Shockey, phPhysics Reports, Vol. 147, Nos. 5 & 6, March, 1987, pp 254-388.
- Publication:
-
APS Shock Compression of Condensed Matter Meeting Abstracts
- Pub Date:
- June 2001
- Bibcode:
- 2001APS..SHK.K1002C