Ultrasonic Nondestructive Evaluation of Damage in Continuous Fiber Composites.

Abstract

It is well known that composite materials suffer complex damage when they are subjected to either monotonic or fatigue loading. This damge affects both the velocity and attenuation of ultrasonic waves. The primary objective of this research is to correlate the damage states with the changes in the velocity and attenuation. Once this has been accomplished the pair of ultrasonic parameters becomes a measure of the damage. A very accurate computer-controlled experimental technique to measure wavespeed in a composite material has been developed. For conventional isotropic materials accuracies of two parts per ten thousand were achieved; for highly damaged Graphite/epoxy composite materials accuracies of 0.2% have been achieved. Keywords: Automation; and Fiber reinforced composites.

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Document Details

Document Type
Technical Report
Publication Date
Apr 01, 1985
Accession Number
ADA164056

Entities

People

  • Vikram K. Kinra

Organizations

  • Texas A&M University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Space

DTIC Thesaurus Topics

  • Accuracy
  • Acoustic Properties
  • Acoustic Waves
  • Air Force
  • Composite Materials
  • Computer Programming
  • Computer Programs
  • Computers
  • Elastic Waves
  • Failure Mode And Effect Analysis
  • Measurement
  • Mechanics
  • Phase Velocity
  • Repetition Rate
  • Ultrasounds
  • Wave Propagation
  • Waveforms

Readers

  • Structural Health Monitoring of Composite Structures.