Development of a Capability for Predicting Cratering and Fragmentation Behavior in Rock.
Abstract
The SRI NAG/FRAG fracture and fragmentation model was incorporated into the Sandia TOODY3 wave propagation code to simulate cratering behavior of hard rock. In laboratory experiments, craters were produced in quartzite rock by detonation of surface explosives and by impact of steel cylinders. Agreement was good between calculated and measured crater dimensions, subcrater fracture damage, and ejecta size distributions. Good agreement was also obtained for the 20-ton buried explosive cratering event, Pre-Schooner Delta. These results support the contention that cratering and ejecta behavior can be accurately predicted when the underlying mechanisms are understood and modeled in a physically realistic way. They also demonstrate the important role of inherent flaws in cratering phenomena and the applicability of the SRI NAG/FRAG failure model. Post-impact metallographic examination of the steel projectiles confirmed that failure occurred by shear banding, indicating thereby that calculations of earth penetrator failure require a computational model for shear bands.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 01, 1975
- Accession Number
- ADA027955
Entities
People
- D. A. Shockey
- Damian Curran
- L. Seaman
- M. E. Austin
Organizations
- SRI International