The Endochronic Theory of Viscoplasticity - Application to the Mechanical Behavior of Metals

Abstract

A theory of thermoviscoplasticity is developed, which is firmly founded on the principles of irreversible thermodynamics of internal variables developed previously by the author. It differs from previous theories in the essential axiom that the material senses changes in deformation and temperature in a time scale which is an inherent material property. The theory has thus been termed ENDOCHRONIC. Material behavior is described in terms of "heredity functions" akin to those in viscoelasticity. Many applications to the mechanical behavior of copper and aluminum are then considered, and many facets of their behavior such as yield, hysteresis, Bauschinger effect, cross-hardening, cyclic hardening, creep and relaxation are predicted and described analytically by the theory, with remarkable accuracy.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1971
Accession Number
AD0736781

Entities

People

  • Han-chin Wu.
  • Kirk C. Valanis

Organizations

  • Stevens Institute of Technology

Tags

Communities of Interest

  • C4I
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Air Force
  • Aluminum Alloys
  • Compression
  • Continuum Mechanics
  • Differential Equations
  • Elastic Properties
  • Experimental Data
  • Free Energy
  • Materials
  • Measurement
  • Mechanics
  • Plastic Properties
  • Shear Stresses
  • Stress Strain Relations
  • Stresses
  • United States

Readers

  • Mechanical Engineering/Mechanics of Materials.
  • Military History of the United States in the 20th Century.