Accession Number : ADA314508

Title :   Intelligent Nondestructive Evaluation of Composite Materials Using Pattern Recognition.

Descriptive Note : Final rept. 27 Nov 92-27 Dec 95,

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF MECHANICAL ENGINEERING

Personal Author(s) : Williams, James H., Jr

PDF Url : ADA314508

Report Date : 27 AUG 1996

Pagination or Media Count : 4

Abstract : A promising ultrasonic non-destructive evaluation (NDE) technique for the characterization of the interphase is given for a single fiber composite. The formal solution to the formulated problem is found via the normal mode expansion method. A computer program is developed for the calculation of the formal solution and its validity is confirmed by two methods: limited case analysis and energy balance analysis. In an attempt to solve the inverse problem of assessing the input parameters from the output parameters, one or more of the input parameters (interphase properties) are assumed to be known as their respective nominal values. For such simplified cases, a graphical technique for solving the inverse problem is developed and demonstrated. Finally, the interphase thickness parameter is shown to be predicted through linear and non-linear multiple regression with high accuracy.

Descriptors :   *NONDESTRUCTIVE TESTING, *FIBER REINFORCED COMPOSITES, *ULTRASONICS, COMPUTER PROGRAMS, MATHEMATICAL MODELS, ALGORITHMS, ACOUSTIC WAVES, ACCURACY, INPUT OUTPUT PROCESSING, PATTERN RECOGNITION, LINEAR REGRESSION ANALYSIS, ACOUSTIC SCATTERING.

Subject Categories : Laminates and Composite Materials
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE