Please use this identifier to cite or link to this item: http://hdl.handle.net/10397/81062
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dc.contributor.authorZhang, Zen_US
dc.contributor.authorXiao, Yen_US
dc.contributor.authorSu, Zen_US
dc.contributor.authorPan, Yen_US
dc.date.accessioned2019-07-22T01:56:33Z-
dc.date.available2019-07-22T01:56:33Z-
dc.date.issued2019-
dc.identifier.citationStructural health monitoring, 2019, v. 18, no. 4, p.1219-1234en_US
dc.identifier.issn1475-9217en_US
dc.identifier.urihttp://hdl.handle.net/10397/81062-
dc.description.abstractIntrinsic mode functions of acoustic emission signals, extracted from signals using empirical mode decomposition, were used to characterize the contact conditions of asperities (e.g. sliding friction or collision) in the mating parts of bolted composite joints undergone flexural vibration, whereby to evaluate the tightening condition of the joints quantitatively. Specifically, the sliding friction–related intrinsic mode functions, generated in the mating parts of the two joining composite components (termed as C-C contact), were ascertained from those generated from the contacts between the joining components and metallic fasteners (termed as M-C contact), via a Hilbert–Huang transform. Subsequently, the C-C contact–related intrinsic mode functions were linked to the contact behaviors of asperities at the joining interfaces, reflecting quantitatively the degree of the residual torque of the bolted joints. The fatigue performance of the joints was further evaluated according to the changes in the energy ratios of the C-C contact–related intrinsic mode functions. Experimental results have revealed that the gross energy of acoustic emission signals is capable of evaluating the residual torque of the joints within a limited range. Vibration loosening of composite joints was found to result in an increase in the energy ratios of C-C contact–related high-frequency intrinsic mode functions, on which basis the detectability of the acoustic emission–based structural health monitoring is further improved, making it possible to evaluate the tightening condition of a bolted joint when the joint undergoes vibration fatigue. This proof-of-concept study provides a promising solution to evaluate the contact conditions of bolted composite joints during assembly and to continuously monitor the tightening condition throughout the service life of the joints using the acoustic emission technique.en_US
dc.description.sponsorshipDepartment of Mechanical Engineeringen_US
dc.language.isoenen_US
dc.publisherSAGE Publicationsen_US
dc.relation.ispartofStructural health monitoringen_US
dc.subjectAcoustic emissionen_US
dc.subjectBolt looseningen_US
dc.subjectBolted composite jointen_US
dc.subjectIntrinsic mode functionen_US
dc.subjectStructural health monitoringen_US
dc.titleContinuous monitoring of tightening condition of single-lap bolted composite joints using intrinsic mode functions of acoustic emission signals : a proof-of-concept studyen_US
dc.typeJournal/Magazine Articleen_US
dc.identifier.spage1219en_US
dc.identifier.epage1234en_US
dc.identifier.volume18en_US
dc.identifier.issue4en_US
dc.identifier.doi10.1177/1475921718790768en_US
dc.identifier.isiWOS:000473498600014-
dc.identifier.scopus2-s2.0-85052573599-
dc.identifier.eissn1741-3168en_US
dc.description.ros2018002871-
dc.description.validate201907 bcwh-
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