超音波探傷試験における新しいき裂深さ測定法の開発 : 第3報,短経路回折波法の実証実験

概要

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This paper deals with a new crack tip diffraction technique named the "short path of diffraction (SPOD)" technique for accurate depth sizing of flaws on the surface opposite to the examination surface in which a pair of an angle beam and a 0-degree transducers is used as a transmitter and a receiver. In SPOD, flaw depth is calculated from a time difference between two echoes of a tip diffracted longitudinal wave, which arises after an incident wave from the angle beam transducer impinges the flaw. One echo is related to a wave traveling directly from the tip to the receiver, and the other is a wave which reflects at the back surface and subsequently travels to the receiver. The two echoes are detected by the 0-degree transducer located right above the flaw. The new technique will be demonstrated by applying to depth sizing of slits and fatigue cracks in austenitic stainless steel blocks, and slits and stress corrosion cracks in welded austenitic stainless steel specimens.
一般社団法人日本機械学会の論文
2007-04-25