Ultrasonic Nondestructive Evaluation of Impact-Damaged Graphite Fiber Composite.

Abstract

Unidirectional Hercules As/3501-6 graphite fiber epoxy composites are subjected to repeated controlled low-velocity drop-weight impacts in the laminate direction. The degradation is ultrasonically monitored using through-thickness attenuation and a modified stress wave factor, SWF. There appear to be strong correlations between the number of drop-weight impacts, the residual tensile strength, the through-thickness attenuation and the SWF. The results are very encouraging with respect to the NDE potential of both of these ultrasonic parameters to provide strength characterizations in virgin as well as impact-damaged fiber composite structures. (MM)

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Document Details

Document Type
Technical Report
Publication Date
May 01, 1980
Accession Number
ADA305943

Entities

People

  • James H. Williams Jr.
  • Norman R. Lampert

Organizations

  • Massachusetts Institute of Technology

Tags

DTIC Thesaurus Topics

  • Attenuation
  • Composite Materials
  • Composite Structures
  • Degradation
  • Epoxy Composites
  • Graphitic Materials
  • Laminates
  • Materials
  • Mechanical Properties
  • Physical Properties
  • Residuals
  • Stress Waves
  • Stresses
  • Tensile Strength
  • Thickness

Fields of Study

  • Materials science
  • Physics

Readers

  • Structural Health Monitoring of Composite Structures.