Ultrasonic Scattering and NDE of Surface Breaking Cracks

Abstract

Scattering of body waves, longitudinal and shear, by a normal surface breaking crack has been studied in this paper. A hybrid method that combines the integral representation of the scattered field with a finite element discretization of the near-field has been used to study the crack opening displacement (COD) and the free-surface displacement (SD). It is shown that both COD and SD are insensitive to the crack-tip field. In addition, at low frequencies the COD is found to be uniform over most of the crack length and thus can be approximated by a constant, which may be estimated from far-field observations. (jes)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1989
Accession Number
ADA225136

Entities

People

  • Khairy R. Khair
  • Subhendu K. Datta

Organizations

  • University of Colorado Boulder

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Angle Of Incidence
  • Boundaries
  • Crack Tips
  • Cracks
  • Displacement
  • Elastic Waves
  • Engineering
  • Equations
  • Free Field
  • Frequency
  • Long Wavelengths
  • Mechanical Engineering
  • Mechanical Properties
  • Scattering
  • Stresses
  • Universities
  • Waves

Fields of Study

  • Physics

Readers

  • Computational Fluid Dynamics (CFD)
  • Electromagnetic Wave Scattering and Antenna Radiation Engineering
  • Materials Science (Mechanical Engineering).