Surface Acoustic Wave Measurements of Surface Cracks in Ceramics,

Abstract

An investigation of scattering from surface cracks has been conducted. In particular, the change in the reflection coefficient of a Rayleigh wave incident on a surface indentation crack has been measured as the sample is stressed to fracture. The acoustic measurements have been correlated with the stable crack extension that precedes final failure. The crack extension behavior in as-intended and annealed specimens was found to be appreciably different. The cracks in the annealed samples exhibited partial crack closure but little stable extension, whereas the cracks in the as-indented samples displayed both crack closure and irreversible crack growth. This behavior has been rationalized by invoking concepts based upon the residual stresses created by indentation. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jun 01, 1981
Accession Number
ADA101241

Entities

People

  • A. G. Evans
  • B. T. Khuri-yakub
  • D. B. Marshall
  • Gordon S. Kino
  • J. J. W. Tien

Organizations

  • Stanford University

Tags

Communities of Interest

  • Air Platforms
  • Energy and Power Technologies

DTIC Thesaurus Topics

  • Acoustic Scattering
  • Acoustic Waves
  • Ceramic Materials
  • Fracture (Mechanics)
  • Frequency
  • Geometry
  • Integrals
  • Materials
  • Materials Science
  • Measurement
  • Mechanics
  • Modulus Of Elasticity
  • Rayleigh Waves
  • Scattering
  • Surface Acoustic Waves
  • Surface Waves
  • Variational Methods

Readers

  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Materials Science (Mechanical Engineering).