A Theory of Rate-Dependent Plasticity

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, creep/relaxation above yield, etc.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1984
Accession Number
ADA142102

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  • W. H. Drysdale

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  • Ballistic Research Laboratory

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  • Applied Mechanics
  • Artillery
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  • Constitutive Equations
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