Modeling RHA Plate Perforation by a Shaped Charge Jet

摘要

Models for metal failure by tensile voids and shear bands are presented andinserted into hydrocode EPIC-2. Each model consists of an onset criterion and a post-onset prescription on stresses. The resulting code is used to simulate an experiment involving perforation of a 13.0-mm-thick RHA plate by the leading particle of an OFHC copper jet produced by firing a shaped charge warhead at long standoff. Quantities evaluated from the experiment and compared with computational results include the final hole radius averaged over the plate's thickness, the final hole shape, the time required for hole formation, the net mass lost by the plate, and the location of voids and shear bands in the final plate cross section. Three parameters are varied in the calculations. One of these is associated with each of the two failure models, and the third with the slideline erosion algorithm. With neither failure model or with only the tensile failure model active, the computed hole is too small and its formation is completed prematurely. However, when both failure models are active, reasonable agreement with the experiment is obtained for a range of parameter values. Three problems are repeated with a finer mesh. The degree of mesh sensitivity is quantified. Shaped Charge Jets; Perforation; Shear Bands; Failure Modeling; Slideline Erosion.