Surface Residual Stress Analysis of Metals and Alloys

Abstract

The critically refracted longitudinal wave (CRLW) technique was used to establish how feasible it is to measure stress changes at the surface and interior of a material, in particular naval airframe metals such as Ti-6AI-4V, 6061-T651 Aluminum, and 4340 steel. The CRLW propagation characteristics were found to be potentially practical if use of the 2P wave is implementable to have it as a reference wave. The CRLW technique was effective in detecting stress gradients in bent plates by measuring the acoustoelastic effect on the longitudinal wave velocity. The CRLW technique was applied in the range of 1.0 to 10 MHz and the expected longitudinal wave velocity changes followed the expected trends in the A16061-T651 and 4340 steel plates (0.50 inch thick). The longitudinal wave velocity changes measured in the Ti-6Al-4V plate did not follow the expected trends probably due to its thickness (0.25 inch).

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Document Details

Document Type
Technical Report
Publication Date
Feb 04, 1992
Accession Number
ADA248372

Entities

People

  • Eugene R. Reinhart
  • Teodoro Leon-salamanca

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Waves
  • Acoustics
  • Diffraction
  • Engineering
  • Materials
  • Materials Science
  • Measurement
  • Mechanical Properties
  • Mechanics
  • Neutron Diffraction
  • Residual Stress
  • Scattering
  • Strain Gages
  • Stress Analysis
  • Ultrasounds
  • Wave Propagation
  • Waveforms

Readers

  • Atmospheric Science / Meteorology, specifically Wind Wave Turbulence.
  • Metallurgy
  • Structural Health Monitoring of Composite Structures.