<title>ESPI-FEM hybrid system for studies of time-dependent stress characteristics in small components</title>

Abstract

Understanding and quantitative modeling of stress relaxation processes are very important for reliable and efficient design of the load resisting structures. In this paper a hybrid ESPI-FEM system for evaluation of time-dependent stress and strain characteristics in small components is presented. Based on results obtained by this method a long term prediction of material behavior can be done. Problems related to the coupling of results from the experiment to an FEM model are discussed and illustrated with reference to speckle interferometry stress analysis of a cantilever beam. Results show that for the conditions tested, stress level in the cantilever beam reduces by 10% of the level at the instant of the loading.

Mapping correlation algorithm as interface between experimental optical technique and computer modeling for the study of mechanical structures

“…18 -20 Most of the EOT-FEM comparative analysis have been done on simple 2-D structures. [1][2][3][4][5][6][7][8][9][10] Seeing the displacement contours obtained by optical technique with contour maps obtained by FEM usually requires qualitative comparisons. In quantitative comparisons, it is common to select a line on both maps or define bilinear 2-D map to define the correlation.…”

“…[1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17] Material mechanical properties, loading and boundary conditions, and geometry validated through experiment are used in optimizing the numerical models.…”