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Automatic Stress Analyzing System by Digital Speckle Photography using 2-D Hybrid Method

机译：Automatic Stress Analyzing System by Digital Speckle Photography using 2-D Hybrid Method

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摘要

The automatic stress analyzing system based on the digital image correlation and 2-D intelligent hybrid method was developed. The surface images of an object before and after the deformation were taken with a CCD camera and a long focal microscope. From these images, the displacement data corresponding to the 2-D mesh pattern were. calculated by digital image correlation. The displacement data obtained from the experiment were including large error, so it is difficult to evaluate the stress and the strain with high accuracy using raw displacement data. We applied the 2-D intelligent hybrid method proposed by Nishioka et al. in order to evaluate the 2-D stress field. Then, the stress and the strain were estimated by the algorithm in the latter half of 2-D finite element method. It is very easy to draw the contour map of the stress or the strain by the post processor. The error of displacement analysis was still large in the present system. It is necessary to raise the accuracy of sub-pixel order deformation of digital image correlation for the purpose of actually aiming at practical use.

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