THE DYNAMIC STRESS-STRAIN RELATION OF LEAD AND ITS DEPENDENCE ON GRAIN STRUCTURE

Abstract

Several specimens of commercial and high-purity lead of various grain size and crystallographic orientation were loaded dynamically in compression by means of the split Hopkinson bar. Strain rate was held constant at approximately 1200/sec for strains up to about 15%. The dynamic stress-strain curves were found to lie approximately 50% higher than the corresponding static curves. The compression tests described formed part of a larger project whose purpose was to determine dynamic values of Tabor's constant for lead and its dependence on crystal orientation. For this purpose the results of the compression tests were combined with those of dynamic indentation tests previously performed on the same lead specimens. It was found that dynamic values of Tabor's constant range from 2.4 to 6.0 depending upon grain size and orientation. These values are approximately equal to the corresponding static values. They may be compared to the value of 2.8 obtained by Tabor and other investigators for numerous fine-grained polycrystalline materials, including lead, and for strains up to about 20%.

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1967
Accession Number
AD0653718

Entities

People

  • J. Duffy
  • J. M. Gondusky

Organizations

  • Brown University

Tags

DTIC Thesaurus Topics

  • Classification
  • Compression
  • Contracts
  • Crystal Structure
  • Crystals
  • Engineering
  • Equations
  • Grain Size
  • Materials
  • Measurement
  • Orientation (Direction)
  • Polycrystals
  • Security
  • Single Crystals
  • Strain Rate
  • Stress Strain Relations
  • Stresses

Readers

  • Materials Science and Engineering.
  • Mechanical Engineering/Mechanics of Materials.