Direct and Inverse Diffraction Problems for QNDE (Quantitative Non-Destructive Evaluation) Applications.

Abstract

A crack in the interior of a solid body can be characterized through its measurable effect on an externally applied ultrasonic field. This final report describes analytical and numerical solutions to the problem of scattering of ultrasonic (elastic) waves by cracks. Such solutions help in the design of ultrasonic tests for crack detection and characterization, and they provide invaluable aid in the interpretation of scattering data for the inverse problem. The configurations that have been considered included near surface cracks and surface breaking cracks, as well as configurations of macro and micro cracks. Solutions for the scattered field have generally been obtained by the boundary element method. Keywords: Flaw detection, Flaw characterization, Ultrasonic methods, Crack scattering.

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Document Details

Document Type
Technical Report
Publication Date
Apr 20, 1988
Accession Number
ADA194721

Entities

People

  • Jan D. Achenbach

Organizations

  • Northwestern University

Tags

Communities of Interest

  • Sensors
  • Space

DTIC Thesaurus Topics

  • Diffraction
  • Elastic Waves
  • Equations
  • Failure Mode And Effect Analysis
  • Frequency
  • Frequency Domain
  • Integral Equations
  • Integrals
  • Inverse Problems
  • Materials
  • Materials Processing
  • Mechanical Properties
  • Mechanics
  • Numerical Analysis
  • Scattering
  • Test And Evaluation
  • Three Dimensional

Readers

  • Structural Health Monitoring of Composite Structures.
  • Theoretical Analysis.
  • Wave Propagation and Nonlinear Chaotic Dynamics.