New Techniques in Nondestructive Testing (Exo-Electron Emission Phase). Part 1

Abstract

A direct connection exists between the fatigue damage in a metal and thermally induced post-fatigue exo-electron emission. This effect is due to the migration of vacancies to the surface. Exo-electron emission can be used to measure fatigue in structures, and monitor annealing of quenched metals. The investigation followed the growth of 'tearing' failures in various metals. The technique can be extended to detection and monitoring of fatigue crack growth. Apparatus for applying these techniques to structures in-the-field has been designed and are being constructed and tested.

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Document Details

Document Type
Technical Report
Publication Date
Dec 01, 1971
Accession Number
AD0748272

Entities

People

  • Mir Turab Ali
  • Stuart A. Hoenig
  • Thomas A. Russell
  • William A. Ott

Organizations

  • University of Arizona

Tags

Communities of Interest

  • Advanced Electronics
  • Air Platforms

DTIC Thesaurus Topics

  • Air Force
  • Aircrafts
  • Detection
  • Detectors
  • Electrical Engineering
  • Electron Emission
  • Electrons
  • Emission
  • Fatigue Life
  • Field Effect Transistors
  • Induction Heating
  • Ionizing Radiation
  • Materials
  • Measurement
  • Migration
  • Military Aircraft
  • Photoexcitation

Fields of Study

  • Physics

Readers

  • Materials Science and Engineering.
  • Structural Health Monitoring of Composite Structures.
  • Systems Analysis and Design

Technology Areas

  • Microelectronics