Stress Intensity Factors for Corner Cracks of Stepped Plate Subjected to Out-of-plane Bending Load

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  • 面外曲げ荷重を受ける段付き平板のすみクラックに対する応力拡大係数
  • メンガイ マゲ カジュウ オ ウケル ダンツキ ヘイバン ノ スミ クラック

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Abstract

The mixed-mode stress intensity factors and the effective stress intensity factors for the corner edge cracks of stepped plate subjected to out-of-plane bending load are evaluated by means of reflective photoelastic experiment. The polycarbonate resin models with silver thin film in the neutral surface are prepared in order to get a good reflection layer, and the cracks with the systematically varied depth and angle are machined on the corner edges.<BR>A large number of the isochromatic fringe patterns taken by means of the CCD camera are recorded in the magneto optical disk, and are transformed into the thinning images of them around the crack tip by using the image processing analyzer. The stress intensity factors are estimated by personal computer using the program based on the over-deterministic method.<BR>The obtained stress intensity factors are summarized in the diagrams shown as the behavior for the variations of crack depth and crack angle. Finally, the results for strip models obtained by this experimental method are compared with the known theoretical ones of the similar problem, and a good agreement between these results are shown. This will assure the the experimental work is appropriate.

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