Development and Application of a Computational Shear Band Model.
Abstract
A computational shear band model has been developed and used to predict the fragmentation response of explosively-loaded cylinders and munitions. The model is based on the physical processes occurring in the material that lead to fragmentation, as observed in experiments in which the fragmentation process was stopped at various stages of development. Good agreement was obtained between measured and computed fragment size distributions for two widely different steels, which suggests that the model can be used to predict the effects of variation of geometry, strain rate, and internal pressure on the fragmentation yield of munitions. In addition, fragments of long-rod penetrators of steel and a tungsten-7Ni-3Fe alloy were examined metallographically to establish the failure modes. The observations suggest that shear banding is a principal mode of penetrator failure. Computational simulations of a plate impacting on edge another plate at various oblique angles were performed using the two-dimensional wave propagation code TROTT with the BFRACT fracture model. The results showed the distribution of shear, compression, and bending stresses in the projectile and indicated the regions where tensile fracture of shear banding might occur.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 01, 1980
- Accession Number
- ADA084029
Entities
People
- D. A. Shockey
- D. C. Erlich
- Damian Curran
- L. Seaman
Organizations
- SRI International