A Critical Review of the Development of Several Viscoplastic Constitutive Theories.

Abstract

The need to model the rate dependence that is inherent in non-recoverable deformation of structural materials and the continued progress in computational capability have served as stimuli for the rapid development of viscoplastic constitutive theory. The structure and development of these theories can be separated into two categories: those with or without yield condition. All theories reviewed here have common underlying features and limitations phenomenological. homogeneous material continuum, nonrecoverable deformation is a constant volume process, deformation may be decomposed into linearly additive elastic and inelastic parts. Comparisons are made among predictions of a modified Chaboche and Bodner theories, and experiments of Inconel at 1200F for various loading conditions. Keywords: Viscoplasticity, Constitutive relations, Inelastic incompressibility and isotropic hardening, Uniaxial constitutive equations, Modification for the strain rate dependence, Modification for directional hardening, Viscoplastic material parameters for inconel at 1200 f for various loading conditions.

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Document Details

Document Type
Technical Report
Publication Date
Sep 15, 1987
Accession Number
ADA185652

Entities

People

  • John Eftis
  • Mitchell I. Jolles

Organizations

  • United States Naval Research Laboratory

Tags

Communities of Interest

  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Classification
  • Constitutive Equations
  • Continuum Mechanics
  • Creep
  • Crystal Structure
  • Differential Equations
  • Equations
  • Hardening
  • High Temperature
  • Incompressibility
  • Mechanics
  • Modulus Of Elasticity
  • Plastic Flow
  • Plastic Properties
  • Shear Stresses
  • Stress Strain Relations
  • Temperature Gradients

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Theoretical Analysis.