Accession Number : AD0257463

Title :   PLASTICITY AND NON-LINEAR ELASTIC STRAINS

Corporate Author : NAVAL ORDNANCE TEST STATION CHINA LAKE CALIF

Personal Author(s) : BACKMAN,MARVIN E.

Report Date : 27 APR 1961

Pagination or Media Count : 1

Abstract : An attempt is made to obtain a description of the material behavior of a metal which is appropriate for high velocity impact and explosive loading. A thermodynamic argument, which includes simple principles of irreversible processes, is used to show how a non-linear elastic description of material behavior is modified by a flow law of plasticity. For an isotropic solid general expressions are obtained for the relation between stress and elastic strain and the relation between plastic strain rate and functions of the stress invariants. These relations are combined for the special strain conditions existing in plane waves in an extended medium to give the time rate of change of stress as a function of the time rate of change of strain, the stress invariants, the total strain and the plastic strain. (Author)

Descriptors :   *DEFORMATION, *ELASTIC PROPERTIES, *PLASTIC PROPERTIES, IMPACT SHOCK, LOAD DISTRIBUTION, MATHEMATICAL ANALYSIS, METALS, SOLID STATE PHYSICS, STRESSES, THEORY, THERMODYNAMICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE