閉口き裂超音波探傷の逆問題解析

概要

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An inverse problem to determine the crack size in nondestructive testing of closed cracks by ultrasonics is analyzed. Ultrasonic testing using a normal incident longitudinal wave is treated for sizing a crack which exists parallel to the measuring surface. Ultrasonic waves pass through the closed crack surfaces, and hence usual techniques applied to open cracks cannot be applied to size closed cracks. Reflection of the wave at the closed crack surface is analyzed based on dynamic elasticity by introducing a model of crack closure with unknown parameters. The unknown parameters are determined along with the unknown location of the crack tip by the inverse analysis, which compares the intensity of the reflected wave obtained through both theory and experiment. The ultrasonic measurements for a cracked specimen under several compressive loadings have shown that the present analysis offers a powerful tool for precise sizing of closed cracks.
一般社団法人日本機械学会の論文
1990-08-25