ACOUSTIC EMISSION UNDER APPLIED STRESS.

Abstract

Studies were made to assess the role of the surface and surface films in the generation of acoustic pulses, i.e., acoustic emission of metals. Experiments were conducted on single crystals of pure gold of varying crystallographic orientation. Specific crystallographic orientations were chosen to evaluate the effect of screw and edge dislocation mobility separately. Specimens were deformed in tension in ambient atmosphere. Results indicate that the surface and its condition play a minor role in the generation of the acoustic pulses; the phenomenon being related to the volumetric condition. Specific observations suggest the development of structural faults during deformation, reminiscent of elemental twins. Emission characteristics peculiar to gold are discussed for the several experiments. (See also AD-419 177). (Author)

Document Details

Document Type
Technical Report
Publication Date
May 01, 1964
Accession Number
AD0600233

Entities

People

  • B. H. Schofield

Tags

DTIC Thesaurus Topics

  • Acoustic Emissions
  • Atmospheres
  • Crystals
  • Demographic Cohorts
  • Dislocations
  • Emission
  • Mobility
  • Observation
  • Orientation (Direction)
  • Single Crystals

Readers

  • Materials Science and Engineering.
  • Pulsed Power and Plasma Physics.