Characterization of contact condition in a flange connection by longitudinal waves

The integrity of flange joints is critical in all pipe systems. To test this integrity, an ultrasonic method characterizing the condition of the flange joint would be a vital tool. In this study, we analyzed the contact conditions on a metal/gasket/metal connection. The instantaneous frequency profi...

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Autores principales:	Hideo CHO, Kanami YAMAMOTO, Kojiro NISHIMIYA, Hiroaki ITO
Formato:	article
Lenguaje:	EN
Publicado:	The Japan Society of Mechanical Engineers 2018
Materias:	contact condition instantaneous frequency ultrasonic measurement numerical calculation Mechanical engineering and machinery TJ1-1570
Acceso en línea:	https://doaj.org/article/af3df2f32da14262ba5b17ad3b6418ce
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spelling	oai:doaj.org-article:af3df2f32da14262ba5b17ad3b6418ce2021-11-26T07:16:02ZCharacterization of contact condition in a flange connection by longitudinal waves2187-974510.1299/mej.17-00568https://doaj.org/article/af3df2f32da14262ba5b17ad3b6418ce2018-02-01T00:00:00Zhttps://www.jstage.jst.go.jp/article/mej/5/2/5_17-00568/_pdf/-char/enhttps://doaj.org/toc/2187-9745The integrity of flange joints is critical in all pipe systems. To test this integrity, an ultrasonic method characterizing the condition of the flange joint would be a vital tool. In this study, we analyzed the contact conditions on a metal/gasket/metal connection. The instantaneous frequency profile, i.e., the phase change of the wave with time for longitudinal waves transmitted in an Al alloy/gasket/Al alloy system, was evaluated under various contact pressures. The instantaneous frequency (IF) was calculated with a complex continuous wavelet transform with a modified Morlet function as a mother wavelet. The maximum IF of the waves monotonically increased with contact pressure, showing similar properties as the amplitude of the waves. A one-dimensional numerical calculation with a finite difference time domain method with a spring condition for expressing various contact conditions or contact stiffness revealed that a large phase delay of the transmission wave was generated at a low contact stiffness interface, and the amount of delay was correlated with the contact stiffness. On the other hand, the delay in the reflected wave was very small.Hideo CHOKanami YAMAMOTOKojiro NISHIMIYAHiroaki ITOThe Japan Society of Mechanical Engineersarticlecontact conditioninstantaneous frequencyultrasonic measurementnumerical calculationMechanical engineering and machineryTJ1-1570ENMechanical Engineering Journal, Vol 5, Iss 2, Pp 17-00568-17-00568 (2018)
institution	DOAJ
collection	DOAJ
language	EN
topic	contact condition instantaneous frequency ultrasonic measurement numerical calculation Mechanical engineering and machinery TJ1-1570
spellingShingle	contact condition instantaneous frequency ultrasonic measurement numerical calculation Mechanical engineering and machinery TJ1-1570 Hideo CHO Kanami YAMAMOTO Kojiro NISHIMIYA Hiroaki ITO Characterization of contact condition in a flange connection by longitudinal waves
description	The integrity of flange joints is critical in all pipe systems. To test this integrity, an ultrasonic method characterizing the condition of the flange joint would be a vital tool. In this study, we analyzed the contact conditions on a metal/gasket/metal connection. The instantaneous frequency profile, i.e., the phase change of the wave with time for longitudinal waves transmitted in an Al alloy/gasket/Al alloy system, was evaluated under various contact pressures. The instantaneous frequency (IF) was calculated with a complex continuous wavelet transform with a modified Morlet function as a mother wavelet. The maximum IF of the waves monotonically increased with contact pressure, showing similar properties as the amplitude of the waves. A one-dimensional numerical calculation with a finite difference time domain method with a spring condition for expressing various contact conditions or contact stiffness revealed that a large phase delay of the transmission wave was generated at a low contact stiffness interface, and the amount of delay was correlated with the contact stiffness. On the other hand, the delay in the reflected wave was very small.
format	article
author	Hideo CHO Kanami YAMAMOTO Kojiro NISHIMIYA Hiroaki ITO
author_facet	Hideo CHO Kanami YAMAMOTO Kojiro NISHIMIYA Hiroaki ITO
author_sort	Hideo CHO
title	Characterization of contact condition in a flange connection by longitudinal waves
title_short	Characterization of contact condition in a flange connection by longitudinal waves
title_full	Characterization of contact condition in a flange connection by longitudinal waves
title_fullStr	Characterization of contact condition in a flange connection by longitudinal waves
title_full_unstemmed	Characterization of contact condition in a flange connection by longitudinal waves
title_sort	characterization of contact condition in a flange connection by longitudinal waves
publisher	The Japan Society of Mechanical Engineers
publishDate	2018
url	https://doaj.org/article/af3df2f32da14262ba5b17ad3b6418ce
work_keys_str_mv	AT hideocho characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves AT kanamiyamamoto characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves AT kojironishimiya characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves AT hiroakiito characterizationofcontactconditioninaflangeconnectionbylongitudinalwaves
_version_	1718409677344079872

Characterization of contact condition in a flange connection by longitudinal waves

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