Accession Number : ADA181692

Title :   A Semiautomated System for Moire Strain Analysis.

Descriptive Note : Final rept.

Corporate Author : ARMY LAB COMMAND WATERTOWN MA MATERIAL TECHNOLOGY LAB

Personal Author(s) : Katz,Alan H

PDF Url : ADA181692

Report Date : Mar 1987

Pagination or Media Count : 21

Abstract : A method for analyzing Moire fringe photographs without acquiring point by point data manually is described. A computer controlled video digitizer is used to acquire video intensity data for up to 1024 x 1024 pixels per photograph. Software was developed to acquire the data and store it locally to the digitizer's computer. Data reduction and analysis is performed on a host minicomputer. Software for this host was developed to upload all the data, perform error checking and subsequently perform the reduction and analysis. The data analysis is performed using a finite elements global smoothing technique. This method allows the displacements to be input to the analysis and the strains determined. Results may be plotted as contours of strain or slices may be taken at any locations in any direction. Keywords: Strain(Mechanics); Image processing; Computer applications; Fourier analysis; Computer programming.

Descriptors :   *DATA PROCESSING, *IMAGE PROCESSING, *COMPUTER PROGRAMMING, *DATA REDUCTION, *DISPLACEMENT, *FINITE ELEMENT ANALYSIS, *MINICOMPUTERS, *COMPUTER PROGRAMS, ANALOG TO DIGITAL CONVERTERS, ERROR ANALYSIS, FOURIER ANALYSIS, INTENSITY, COMPUTERS, CONTROL, VIDEO SIGNALS

Subject Categories : Mechanics
      Computer Programming and Software

Distribution Statement : APPROVED FOR PUBLIC RELEASE