Robust Algorithms for Penetration Mechanics Problems
Abstract
We have investigated the differences in the performance of identical depleted uranium (DU) and tungsten heavy alloy (WHA) rods when deformed in pure torsion, plane strain compression, and during impact at normal incidence onto a smooth rigid block or a deformable steel target. The thermomechanical response of the material has been modeled by the Johnson Cook relation that accounts for strain and strain rate hardening of the material and its thermal softening. The effect of modeling the thermal softening by a power law rather than the affine function has also been delineated. It is found that shear bands form at a lower value of the nominal strain in the WHA rod as compared to that in the DU rod during torsion, plane strain compression and the Taylor impact test. However, in the penetration test, a propensity of shear bands form in the DU penetrator in the region abutting the target penetrator interface and also in the ejecta where the penetrator particles turn to flow backwards. Fewer shear bands form in the WHA rod and they are smeared out resulting in a uniformly deformed zone of intense plastic deformation. Numerical simulation of a ceramic rod impacting a WHA plate showed that at high speeds a ceramic rod will perforate a WHA plate.
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1998
- Accession Number
- ADA344460
Entities
People
- R. C. Batra
Organizations
- Virginia Tech