20405 平面偏光器から得られた光弾性縞からの等色線縞次数の決定(実験力学的手法による生体・材料・製品の評価(2),OS.7 実験力学的手法による生体・材料・製品の評価)

概要

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A new method for automatically determining the absolute fringe orders of isochromatics in the whole field of a model was applied to experimental photoelastic fringes obtained in a plane polariscope, and the effectiveness of the method was evaluated. This method used the following four data: (1) a set of five color photoelastic images, which were obtained at five sets of angular positions of the polaroids in dark- and light-field polariscopes, to obtain relative fringe orders; (2) the points of reversal of increase and decrease in the fringe orders; (3) the points of extremal values of relative fringe orders; and (4) the first unwrapped phase regions between 0 and 0.5 fringe orders, which are used as seed points. A set of five color photoelastic fringes for a circular disk subjected to a concentrated load was used. Results showed that the proposed method yields accurate the absolute fringe orders of isochromatics.
2009-03-05