ACOUSTIC EMISSION UNDER APPLIED STRESS

Abstract

This report concerns specific investigation undertaken to assess the role of the surface oxide layer in the generation of acoustic pulses in metals, i.e., acoustic emission. Experiments were conducted on single crystals of aluminum of different crystallographic orientation. The specimens were pulled in tension both in atmosphere and exposed to etchant solutions. Results demonstrated the oxide layer is not itself an emission source and that the emission characteristics are significantly modified as a result of the influence of the oxide on the deformation behavior of the specimens. Specific observations suggest the operative mechanism of emission generation and the importance of the role played by the surface condition in the deformation of metals.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1963
Accession Number
AD0419177

Entities

People

  • B. H. Schofield

Tags

DTIC Thesaurus Topics

  • Acoustic Emissions
  • Chemistry
  • Crystals
  • Current Density
  • Elastic Waves
  • Engineering
  • Frequency
  • Materials
  • Materials Laboratories
  • Mechanical Properties
  • Oxide Films
  • Single Crystals
  • Strain Rate
  • Stress Strain Relations
  • Stresses
  • Surface Properties
  • United States

Readers

  • Materials Science and Engineering.
  • Powder metallurgy of Titanium alloys.
  • Theoretical Analysis.