Conversion of displacement/strain full-field experimental data into FEM
by
Leszek Salbut
Warsaw University of Technology, Institute of Micromechanics and Photonics
Coauthors: Malgorzata Kujawinska, Robert Sitnik

The basic source of experimental data for hybrid methods in solid state mechanics are optical full-field methods including moire, holographic and speckle interferometry. The output of these methods are interferograms from which the coded measurand is retrived by automatic fringe pattern analysis methods. The measurand is delivered as the high resolution file with equally sampled values of displacement or strain (eg.512 x 512) within the experimental field of view. These data may be used in hybrid methods by transfering the values of displacement/ strains into the mesh of nodes specified by FEM procedures. The paper describes the methodology of experimental data preprocessing and interpolation of the measurand values into the FEM mesh which usually is not uniformly spaced over the domain and has reduced number of nodes.Additionally the problem of domains mathing between experimental field of view and FEM is discussed. The methodology is presented on the example of hybrid analysis of ceramic-to-metal joint. The specific problems connected with high noise and high strain gradients are presented.

Date received: February 19, 1999

Copyright © 1999 by the author(s). The author(s) of this document and the organizers of the conference have granted their consent to include this abstract in Atlas Conferences Inc. Document # cacp-60.