The Ultrasonic Detection of Unbond in Deep Layers of Multilayered Composites.

Abstract

The through transmission ultrasonic method was applied to the problem of detecting unbond in deep layers of multilayer composites. A casting containing severe internal defects was used for the base metal. A range of thickness and non-parallel surfaces were considered. Using the decibel scale, the casting was characterized on a one inch grid. From the difference between this and subsequent measurements as layers were applied, it was possible to distinguish between bond and unbond on layers well beneath the surface.

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Document Details

Document Type
Technical Report
Publication Date
May 10, 1982
Accession Number
ADA119402

Entities

People

  • Jeffrey M. Warren
  • Robert A. Youshaw

Organizations

  • Naval Ordnance Laboratory

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Acoustic Impedance
  • Acoustic Propagation
  • Base Metal
  • Boundaries
  • Composite Materials
  • Detection
  • Frequency
  • Materials
  • Measurement
  • Metals
  • Nondestructive Testing
  • Reflection
  • Sound Transmission
  • Sound Waves
  • Test And Evaluation
  • Ultrasonic Frequencies
  • Waves

Fields of Study

  • Materials science

Readers

  • Fluid Dynamics.
  • Nanofabrication and Microfabrication.
  • Structural Health Monitoring of Composite Structures.