THE INFLUENCE OF STRAIN RATE AND STRAIN AGEING ON THE FLOW STRESS OF COMMERCIALLY PURE ALUMINUM

Abstract

Tensile tests on annealed, commercially pure aluminum specimens were performed in a hard machine at different temperatures for a number of constant strain rates. The results show that a range of strain, strain rate, and temperature exists for which the flow stress decreases with strain rate. This material property, when coupled with suitable mechanical conditions, is believed to be cause of discontinuous, repeated yielding. Various experiments, especially relaxation and reloading tests, show that the decrease of flow stress with strain rate can be directly attributed to rapid strain aging due to impurity diffusion. Other experiments indicate the same effect for different loading histories. An analytical representation of the strain rate and strain aging of the material is developed which predicts results in very good agreement with the experiments.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1966
Accession Number
AD0641995

Entities

People

  • A. Rosen
  • S. R. Bodner

Organizations

  • Technion – Israel Institute of Technology

Tags

Communities of Interest

  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Age Hardening
  • Crystal Structure
  • Engineering
  • Equations
  • Hardening
  • Heat Treatment
  • Load Cells
  • Materials
  • Mechanical Engineering
  • Mechanical Properties
  • Mechanics
  • Relaxation Time
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Test Methods
  • Yield Strength

Fields of Study

  • Materials science

Readers

  • Mechanical Engineering/Mechanics of Materials.