FEASIBILITY OF USING OPTICAL CORRELATION TECHNIQUE FOR DETECTING IMPENDING FATIGUE FAILURE

Abstract

An investigation to determine the feasibility of using an optical correlation technique to detect fatigue cracks in materials is discussed. The optical system used included a helium-neon gas laser for generating coherent light, a commercially available photographic plate for recording the hologram, and a photomultiplier tube for measuring the light intensity. As a part of the investigation, holographic interferometric experiments were performed for comparison. During testing, aluminum-alloy specimens with various surface finishes and configurations were subjected to different stress levels and the effects were measured.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1969
Accession Number
AD0690216

Entities

People

  • E. Manuel Marom
  • K. C. Chuang

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Aluminum Alloys
  • Correlation Techniques
  • Crack Propagation
  • Detection
  • Diffraction
  • Distortion
  • Failure Mode And Effect Analysis
  • Fatigue Tests (Mechanics)
  • Gas Lasers
  • Lasers
  • Light Sources
  • Materials
  • Measurement
  • Photomultiplier Tubes
  • Surface Properties
  • United States
  • X Rays

Fields of Study

  • Physics

Readers

  • Optical Physics and Photonics.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • Directed Energy