Stress Analysis around the Crack-Tip of Homogeneous Material by Speckle Photography and Image-Processing.

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  • スペックル法と画像処理による均質材き裂先端の応力解析
  • スペックルホウ ト ガゾウ ショリ ニ ヨル キンシツザイ キレツ センタン ノ オウリョク カイセキ

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Abstract

The point-by-point measurement of in-plane displacement was conducted by the point-wise filtering approach of speckle photography.Young's fringes analysis is based on the 2-D fast Fouriertransform and bounded Newton-Raphson algorithm.This system can analyze many fringe patterns with high speed and accuracy.A large number of Young's fringe patterns around the crack tip were taken by a CCD camera and analyzed by the image-processing system developed in my laboratory.The displacement obtained by speckle photography is not as smooth as that obtained by the finite element analysis.Therefore, the displacement data were smoothed by 2-D fast Fourier transform and the least squares method.Then, stress-strain analysis was conducted by using those data.

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