The above-mentioned ultrasonic transmission aspect, through the 1st viscous media which is viscous media

摘要

PROBLEM TO BE SOLVED: To provide an ultrasonic propagation velocity measuring method capable of measuring accurately the propagation velocity of an ultrasonic wave propagating in the surface layer part of a solid member, and a solid surface fatigue degree measuring method using it.;SOLUTION: An SH wave transmitter 1 and an SH wave receiver 2 are mounted mutually separately on an orbital plane 10A in the state where a viscous medium is applied as much as 0.15 to 0.25 mg/mm² between the SH wave transmission face 7 having Ra of 0.6 to 0.8μm of the SH wave transmitter 1 and the SH wave reception face 8 having Ra of 0.6 to 0.8μm of the SH wave receiver 2, and the orbital plane 10A. The SH wave transmitted from the SH transmitter 1 and propagated near the surface layer of the orbital plane 10A is received by the SH wave receiver 2, and the propagation velocity of the SH wave along the orbital plane 10A is measured. The propagation velocity is compared with a standard value of a strain, decarbonization or grinding burn, to thereby determine existence of the strain, the decarbonization or the grinding burn on the surface layer part of the orbital plane 10A.;COPYRIGHT: (C)2005,JPO&NCIPI