Exploratory Nondestructive Evaluation (NDE) Research for Advanced Materials and Processes. Volume 2: Shearography Improvements

Abstract

Shearography Improvements: Shearographic inspection of aerospace structures has not gained wide acceptance, owing to the difficulty of interpreting shearographic images. A feature extraction method was developed that calculates surface normal curvature from input shearograms. The method can be applied in real time to provide a technician unambiguous images representing areas of locally high curvature, which will generally highlight the boundaries of flaws. Images are load independent and insensitive to part viewing angle. Analytical and experimental validation tests were completed for vacuum, vibrational and thermal loading. Recommendations are presented for system development, and for practical implementation of shearography.

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Document Details

Document Type
Technical Report
Publication Date
Jul 01, 1998
Accession Number
ADA365635

Entities

People

  • Benjamin Knutson
  • James Nelson
  • Lyle Deobald
  • Richard Bossi
  • Robert Nerenberg

Organizations

  • Boeing Defense, Space & Security

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Advanced Materials
  • Air Force Research Laboratories
  • Algorithms
  • Composite Materials
  • Computational Science
  • Curvature
  • Data Processing
  • Detection
  • Failure Analysis
  • Failure Mode And Effect Analysis
  • Feature Extraction
  • Geometry
  • Image Processing
  • Materials
  • Resonant Frequency
  • Shape
  • Test And Evaluation

Fields of Study

  • Physics

Readers

  • Instructional Design and Training Evaluation.
  • Spectroscopy.
  • Structural Health Monitoring of Composite Structures.

Technology Areas

  • AI & ML
  • AI & ML - Bayesian Inference
  • Space