Loosening Detection of a Bolted Joint Based on Monitoring Dynamic Characteristics in the Ultrasonic Frequency Region

Takanori Niikura, Naoki Hosoya*, Shinji Hashimura, Itsuro Kajiwara, Francesco Giorgio-Serchi

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract / Description of output

In typical structures and machines, bolted joints are used for easy assembly, disassembly, and maintenance. However, axial force control is critical because a decrease in the axial force (viz., the fastening force) of bolted joints results in fatigue fractures due to the applied vibrations on the bolted joints and chronic degradation. This work assesses the feasibility of detecting weakly torqued bolted joints by studying the correlation between the variation in axial force of the bolt and the shift in the natural frequency of the protruding threaded part of the bolt. It has been shown that the rigidity of the jointed area at the base of the protruding thread part decreases in accordance with the decrease in the axial force of the bolt. This is attributed to a decrease in the natural frequency of the protruding thread part. Under these assumptions, the axial force on bolted joints is assessed. The accuracy with which axial force can be estimated depends on the extent of the shift in the natural frequency of the protruding thread part. To investigate the practical usability of our method on strength classification of bolts, we assessed the performance of loosening detection in three strength classifications (4.8, 8.8, and 10.9).
Original languageEnglish
Title of host publicationVibration Engineering for a Sustainable Future
Subtitle of host publicationExperiments, Materials and Signal Processing, Vol. 2
PublisherSpringer, Cham
Chapter25
Pages191-196
ISBN (Electronic)978-3-030-48153-7
ISBN (Print)978-3-030-48152-0
DOIs
Publication statusPublished - 23 Apr 2021
Event18th Asia Pacific Vibration Conference - University of Technology Sydney, Sydney , Australia
Duration: 18 Nov 201920 Nov 2019
Conference number: 18
http://apvc2019.org/index.html

Conference

Conference18th Asia Pacific Vibration Conference
Abbreviated titleAPVC 2019
Country/TerritoryAustralia
CitySydney
Period18/11/1920/11/19
Internet address

Keywords / Materials (for Non-textual outputs)

  • modal analysis
  • vibration
  • experimental methods
  • STRUCTURAL FAILURE
  • Steel structure
  • high frequency vibrations

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