1468 分光光学系付きデジタルカメラにより取得した光弾性縞からの主応力方向の決定(S20-6 応力・ひずみ分布計測法(2),S20 実験力学的手法による材料・製品の評価)

概要

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A method was developed for automatically determining principal-stress directions from photoelastic fringes obtained using a digital camera with a multi-spectrum separation optical system mounted three interferential filters (R, G and B filters). This method used a set of four color photoelastic fringe images, which were obtained corresponding to an angular position of polaroids in a dark-filed plane polariscope. The four color images were converted to four monochrome images. The principal-stress directions were obtained by applying a phase-shift method to the set of monochrome photoelastic fringe images. To evaluate the accuracy of the proposed method, principal-stress directions determined from a set of four color photoelastic images for a circular disk subjected to a concentrated load were compared with those from the theory. Results showed that the proposed method yields accurate principal-stress directions.
2005-09-18