Penetration of Rod Projectiles in Semi-Infinite Targets: A Validation Test for Eulerian X-FEM in Alegra
Abstract
The finite-element shock hydrodynamics code ALEGRA has recently been upgraded to include an X-FEM implementation in 2D for simulating impact, sliding, and release between materials in the Eulerian frame. For validation testing purposes, the problem of long-rod penetration in semi-infinite targets is considered in this report, at velocities of 500 to 3000 m/s. We describe testing simulations done using ALEGRA with and without the X-FEM capability, in order to verify its adequacy by showing X-FEM recovers the good results found with the standard ALEGRA formulation. The X-FEM results for depth of penetration differ from previously measured experimental data by less than 2%, and from the standard formulation results by less than 1%. They converge monotonically under mesh refinement at first order. Sensitivities to domain size and rear boundary condition are investigated and shown to be small. Aside from some simulation stability issues, X-FEM is found to produce good results for this classical impact and penetration problem.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 12, 2013
- Accession Number
- ADA580847
Entities
People
- Byoung Y. Park
- John Niederhaus
- R. B. Leavy
Organizations
- Sandia National Laboratories