交流電位差法による三次元表面き裂の応力拡大係数計測

概要

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A method for applying a. c. potential drop technique is proposed to evaluate the stress intensity factor K_I for a 3-D surface crack. The effect of load on a. c. potential drop measured on the surface of a specimen which contains a 3-D surface crack has been utilized to evaluate K_I for the crack. The analysis of the inverse problem has been done for determining K_I, where the measurements of the change in potential drop due to the change in load applied to the specimen have been compared with theoretical computations which include K_I as an unknown quantity. The measurements have been done under three-point bending for a semielliptical surface crack introduced by fatigue. The evaluated value of K_I based on the present method has been compared with the solutions of elastic analyses reported so far, and the present method has been verified.
一般社団法人日本機械学会の論文
1991-09-25