Numerical Modeling of Penetration Into a Compressible Viscoplastic Media

摘要

This report results from a contract tasking Universite de Savole as follows: The contractor will develop new computational techniques and use them to gain fundamental understanding of the physical phenomena associated with penetration into a semi-infinite geological target of a hard (rigid) penetrator at intermediate impact velocities (typically below 1000 m/s). The contractor we will implement viscoplastic models accounting for the combined effects of high strain rate and high confinement on the response of geologic and cementitious materials. The focus will be on capturing increased hardening with compaction; diminished strain rate sensitivity with compaction; damage induced anisotropy; non-symmetrical strength effects in the target material and how these target properties affect the penetrator performance. Predictive capabilities for describing separation and damage ahead of the projectile will also result from this investigation.