THE EFFECTS OF ANISOTROPY ON SLUG FORMATION OF TANTALUM EFP'S

IT IS WELL-KNOWN THAT A SLIGHT VARIATION IN THE LINER MATERIAL PROPERTIES MAY CHANGE THE SHAPE OF THE SLUG. THE EXACT MECHANISM OF THIS IS STILL NOT CLEARLY UNDERSTOOD, BUT ONE REASON FOR THIS OCCURRENCE IS ANISOTROPIC BEHAVIOR. ANISOTROPY, DEFINED AS THE DIRECTIONAL DEPENDENCE OF PROPERTIES, IS GENERALLY CAUSED BY AN INHOMOGENEOUS TEXTURE IN THE MATERIAL. DYNA EAST PROPOSES TO DETERMINE THE CAUSE AND AFFECT RELATIONSHIP BETWEEN EFP FABRICATION METHODS, MATERIAL ANISOTROPY, AND EFP PERFORMANCE. DIFFERENT FABRICATION METHODS WILL BE USED TO FORM LINER PREFORMS, AND THE RELATIVE ANISOTROPY (BASED ON DIRECTIONAL MECHANICAL STRENGTH PROPERTIES) CREATED BY EACH PROCESS WILL BE STUDIED. THESE RESULTS WILL BE USED AS INPUT TO A COMPUTER CODE TO PREDICT RESULTING EFP SLUG PROPERTIES. CODE PREDICTIONS WILL BE COMPATED TO ACTUAL TEST RESULTS, AND THE CODE WILL BE MODIFIED AS NECESSARY. THUS, FOR A GIVEN SET OF ANISOTROPIC CHARACTERISTICS, THE CODE WILL BE ABLE TO PROVIDE SUCH INFORMATION AS SLUG SHAPE. IN REVERSE, THE PROPOSED WORK WILL HELP ESTABLISH WHICH FABRICATION METHOD SHOULD BE USED IN ORDER TO ACHIEVE A SPECIFIC DESIRABLE SLUG SHAPE.