Accession Number : ADA194721

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

Descriptive Note : Final rept. 1 Sep 84-29 Feb 88,

Corporate Author : NORTHWESTERN UNIV EVANSTON IL DEPT OF CIVIL ENGINEERING

Personal Author(s) : Achenbach, J D

PDF Url : ADA194721

Report Date : 20 Apr 1988

Pagination or Media Count : 7

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.

Descriptors :   *NONDESTRUCTIVE TESTING, *ULTRASONIC TESTS, *CRACK PROPAGATION, NUMERICAL ANALYSIS, CRACKS, DIFFRACTION, DEFECTS(MATERIALS), DETECTION, ELASTIC PROPERTIES, SOLID BODIES, QUALITY CONTROL, MANUFACTURING, ELASTIC WAVES

Subject Categories : Mechanics
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE