2012 Fiscal Year Final Research Report

Estimation of surface pressure on a flange connection using non-linear ultrasonics

Research Project

Project/Area Number	22560728
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	Material processing/treatments
Research Institution	Aoyama Gakuin University
Principal Investigator	CHO Hideo 青山学院大学, 理工学部, 准教授 (60296382)
Project Period (FY)	2010 – 2012
Keywords	非破壊検査
Research Abstract	For estimating surface pressure on a flange connection, non-linear ultrasonics and transmission coefficient of longitudinal wave propagating through an contacting interface were utilized. In a non-linear ultrasonic measurement on which double frequency of the incident longitudinal waves (second harmonic waves) to an interface was obtained, it is confirmed that a generation coefficient of the second harmonic waves related to surface pressure on a contacting interface. Distribution of the surface pressure can be estimated by using generation coefficient of the second harmonic waves. On the other hand, it is confirmed that the transmission coefficient on higher frequency component decreased as the surface pressure decreased. With frequency dependence of the transmission coefficient, the surface pressure can be obtained in a wide pressure range.

(4 results)