Accession Number : ADP000005

Title :   Simulations of Ballistic Impact Situations Involving Deep Penetration and Perforation of Targets with a Lagrangian Impact Code,


Personal Author(s) : Ringers,Barbara E.

Report Date : SEP 1982

Pagination or Media Count : 14

Abstract : A major enhancement to the capabilities of EPIC-2, a Lagrangian finite element impact code, has been developed and implemented enabling the modeling of deep penetration and/or perforation of targets. This paper presents the techniques which were developed to handle dynamic relocation of sliding surfaces and the automatic addition of new sliding surfaces. These techniques were first applied to the modeling of axisymmetric ballistic impact situations involving kinetic energy penetrators versus targets which fail by plugging due to high strains. The criteria which were required for target failure to begin and proceed 'naturally', ultimately resulting in perforation when warranted, are discussed. A parametric study is presented of a steel cylinder versus a pure titanium target at normal obliquity. Only the striking velocity and the critical level of equivalent strain necessary to mandate failure were varied. The results are demonstrated to be consistent between calculations; further-more, no rezoning or manual intervention was involved in any of the calculations. (Author)

Descriptors :   *Finite element analysis, *Impact tests, *Steel, *Titanium alloys, *Failure(Mechanics), Penetration, Kinetic energy, Perforation, Armor piercing ammunition, Simulation, Ballistics, Firing tests(Ordnance), Deformation, Roller bearings, Sliding contacts, Shear stresses, Hardness, Equations, Adiabatic conditions

Subject Categories : Metallurgy and Metallography
      Numerical Mathematics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE