A Hardness Law for Inelastic Deformation.

Abstract

Certain formulations of elastic-viscoplastic constitutive equations lead to inelastic deformations being governed by a functional relation between the plastic deformation rate and the stress. This relation is taken to be a unique, continuous function at a constant microstructural condition specified by certain state variables. On the assumption that a single state variable referred to as hardness is adequate to represent overall resistance to plastic flow, the problem becomes one of determining evolutionary equations for the dependence of the hardness parameter on loading history. A procedure for calculating hardness changes for general multiaxial loading histories is proposed in this paper. Stress-strain relations that would be predicted by this procedure appear to be consistent with experimental results for various multiaxial loading histories including proportional and non-proportional cyclic loading. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Nov 01, 1976
Accession Number
ADA035577

Entities

People

  • S. R. Bodner

Organizations

  • Technion – Israel Institute of Technology

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Air Force
  • Constitutive Equations
  • Continuum Mechanics
  • Elements
  • Equations
  • Hardening
  • Hardness
  • Mechanics
  • Plastic Deformation
  • Plastic Flow
  • Plastic Properties
  • Scientific Research
  • Softening
  • Strain Hardening
  • Strain Rate
  • Stress Strain Relations
  • Stresses

Readers

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