Accession Number : AD0676110

Title :   CONSTITUTIVE EQUATIONS DEVELOPED FROM IMPACT STUDIES,

Corporate Author : BALLISTIC RESEARCH LABS ABERDEEN PROVING GROUND MD

Personal Author(s) : Gillich,William J.

Report Date : SEP 1968

Pagination or Media Count : 37

Abstract : It was discovered through free flight impact tests using specimens traveling at a constant velocity prior to impact that one form of the deformation curve for high purity aluminum and copper single crystals could be represented as a 1/4-power law. This particular deformation law as found to be predictable using the stress and strain ratios of the aggregate theory of Taylor. These predictions were made on the basis of the deformation of polycrystalline metals. A generalization of the 1/4-power law constitutive relation is shown to account for uniaxial deformation that occurs for both single crystal and polycrystalline specimens subjected to static or dynamic deformations. This formulation is related to the parabolic type of constitutive development proposed by Bell. (Author)

Descriptors :   (*CRYSTALS, DEFORMATION), EQUATIONS, STRESSES, SINGLE CRYSTALS, METAL CRYSTALS, IMPACT TESTS, ALUMINUM, COPPER, PREDICTIONS

Subject Categories : Crystallography
      Mechanics

Distribution Statement : APPROVED FOR PUBLIC RELEASE