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2報,短経路回折波法の考案

概要

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A new crack tip diffraction technique is proposed 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 receiver. In this technique, flaw depth is easily calculated from the time difference between two echoes of a tip diffracted longitudinal wave, which arises after the incident wave from the angle beam transducer impinges on the flaw. One echo is related to the wave traveling directly from the tip to the receiver, and the other is a wave which is reflected at the back surface and subsequently travels to the receiver. These two echoes are detected by the 0-degree transducer located right above the flaw. Depth sizing by the proposed technique is much easier than those by standard crack tip diffraction or TOFD techniques. The new technique will be discussed by use of a finite element program to predict the behavior of wave propagation and received wave forms.
一般社団法人日本機械学会の論文
2007-04-25