Accession Number:

ADA142102

Title:

A Theory of Rate-Dependent Plasticity

Descriptive Note:

Final rept.

Corporate Author:

ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD

Personal Author(s):

Report Date:

1984-05-01

Pagination or Media Count:

64.0

Abstract:

The classical theory of rate-independent plasticity is modified by the addition of a rate variable to the yield surface. From considerations of physical metallurgy it is shown that the correct parameter to add is the effective plastic stRAIN RATE. Constitutive equations suitable for a rate- dependent elastic-plastic finite element structural analysis code are derived. For the simple loading case of uniaxial stress, an exact solution is derived which models many of the rate-dependent effects observed in material testing, e. g. the behavior of the stress-strain curves for constant rate tests change of rate tests, creeprelaxation above yield, etc.

Subject Categories:

  • Mechanics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE