Accession Number : ADA956235

Title :   Analysis of Hypervelocity Perforation of a Visco-Plastic Solid Including the Effects of Target-Material Yield Strength,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION WASHINGTON DC

Personal Author(s) : Thomson, Robert G.

Report Date : APR 1965

Pagination or Media Count : 42

Abstract : A visco-plastic flow theory for the solution of hypervelocity perforation of thin plates has been investigated. A short-time analytical solution of the governing equation including the effects of yield strength of the target material was obtained and expressions were derived for the velocities, displacements, strains and strain rates present in the target material during hypervelocity impact. In addition, pertinent parameters have been varied and a comparison has been made with the solution in which the yield strength was neglected. The results indicate that velocities, displacements, and stresses determined from the present solution are at times markedly different from the results obtained when the yield strength was neglected. The results indicate that the velocities, displacements, and stresses determined from the present solution are at times markedly different from the results obtained when the yield strength is neglected. The effects on the radius of perforation of the plate material when the yield strength is included were found to be not as significant as those of the solution neglecting target yield strength and resulted in little variation in the computed perforation radii.

Descriptors :   *TERMINAL BALLISTICS, *HYPERVELOCITY PROJECTILES, *HYPERVELOCITY IMPACT, *TARGET STRENGTH, *YIELD STRENGTH, VISCOPLASTICITY, PERFORATION, PENETRATION, STRAIN RATE, DISPLACEMENT, STRESS STRAIN RELATIONS.

Subject Categories : Ballistics
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE