Determination of Residual Stress by Magnetomechanical Acoustic Emission.

Abstract

This paper presents a newly discovered method for residual stress measurements. It applies to ferromagnetic materials only, but has a greater depth of penetration than X-ray diffraction and other methods, and is nondestructive. Materials under test are subjected to alternating magnetic fields. When internal structures of magnetic domains are altered, ultrasonic waves are generated; that is acoustic emission. This magnetomechanical acoustic emission (MAE) depends on the level of residual stress. It is also affected by the chemical composition, microstructure (heat treatment) and prior cold working of the material. Basic behavior and dependencies of MAE are to be described. Several applications will be discussed, including MAE measurements on structural shapes, welds and railroad rails. (Author)

Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1980
Accession Number
ADA084065

Entities

People

  • Kanji Ono
  • M. Shibata
  • May M. Kwan

Organizations

  • University of California, Los Angeles

Tags

DTIC Thesaurus Topics

  • Acoustic Emissions
  • Chemical Composition
  • Cold Working
  • Emission
  • Ferromagnetic Materials
  • Heat Treatment
  • Magnetic Domains
  • Magnetic Fields
  • Materials
  • Materials Processing
  • Residual Stress
  • Residuals
  • Stresses
  • Ultrasounds
  • X Rays
  • X-Ray Diffraction

Readers

  • Calculus or Mathematical Analysis
  • Materials Science and Engineering.
  • Metallurgy