Detection of Cracks and Measurement of Stress Intensity Factors by Infrared Video System

概要

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First, the authors proposed a method for detecting cracks embedded in the structural members by an infrared thermal video system. The device used in this study, TVS (thermal video system)-3300, enables the distribution of temperature on the surface of the specimen to be measured and processed, thus producing real-time pictures. Various kinds of heating techniques snd the resulting thermal pictures were compared and the applicability of the proposed method was discussed. Then, the authors showed that the stress intensity factor, K, can be analyzed by measuring the distribution of the sum of the principal stresses around the crack tip by an infrared stress measuring device, SPATE-8000. The errors of the measured K-values for CT-specimens are at most l0-20%, and they decrease with decreasing amplitude of the applied cyclic stresses. The method has been applied to the measurement of K for a surface crack, and of K_I and K_II for a mixed mode crack.
一般社団法人日本機械学会の論文
1990-07-15