Creep of 2618 Aluminum under Step Stress Changes Predicted by a Viscous-Viscoelastic Model.

Abstract

Nonlinear constitutive equations are developed and used to predict from constant stress data the creep behavior of 2618 Aluminum at 200 C (392 F) for tension or torsion stresses under varying stress history including step-up, step-down, and reloading stress changes. The strain in the constitutive equation employed includes the following components: linear elastic, time-independent plastic, nonlinear time-dependent recoverable (viscoelastic), nonlinear time-dependent nonrecoverable (viscous) positive, and nonlinear time-dependent nonrecoverable (viscous) negative. The modified superposition principle, derived from the multiple integral representation, and strain hardening theory were used to represent the recoverable and nonrecoverable components, respectively, of the time-dependent strain in the constitutive equations. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1979
Accession Number
ADA070355

Entities

People

  • James S. Lai
  • William N. Findley

Organizations

  • Brown University

Tags

Communities of Interest

  • Counter IED

DTIC Thesaurus Topics

  • Agreements
  • Aluminum
  • Constitutive Equations
  • Creep
  • Creep Tests
  • Delta Functions
  • Engineering
  • Equations
  • Experimental Data
  • Hardening
  • Intervals
  • Materials
  • Recovery
  • Strain Hardening
  • Strain Rate
  • Stresses
  • Unloading

Fields of Study

  • Engineering

Readers

  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)
  • Mechanical Engineering/Mechanics of Materials.