Flaw Detection and Evaluation of Composite Cylinders Using Laser Speckle Interferometry and Holography

Abstract

The objective of this work was to determine what constitutes a flaw in a composite tube. Speckle interferometry and holography were used to measure surface displacements of 108 fiber reinforced thin wall cylinders. E-glass, S- glass and Kevlar fibers were used. Cut fiber and impact flaws were investigated. A new automated laser speckle interferometry displacement contour analyzer was used in conjunction with a computer for data analysis. The system analyzes 5000 data points in less than four minutes. Full field reconstruction of laser speckle interferograms and holograms is presented. The techniques described give the investigator a full field displacement picture of the flawed structures as well as displacement data that can be used to determine stresses and strains.

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Document Details

Document Type
Technical Report
Publication Date
Nov 23, 1979
Accession Number
ADA088206

Entities

People

  • Terry L. Vandiver

Organizations

  • United States Army Aviation and Missile Command

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Analyzers
  • Composite Materials
  • Data Analysis
  • Detection
  • Holograms
  • Interferograms
  • Interferometry
  • Jet Propulsion
  • Materials
  • Metal Matrix Composites
  • Military Research
  • Photographs
  • Spearography
  • Tensile Strength
  • Test And Evaluation
  • Three Dimensional
  • Walls

Fields of Study

  • Physics

Readers

  • Materials Science (Mechanical Engineering).
  • Optical Physics and Photonics.
  • Reinforced Composite Materials

Technology Areas

  • Directed Energy