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Measurement of the clamping force applied by load-bearing bolts using a combination of compression and shear ultrasonic waves
LuleƄ University of Technology, Sweden.
RISE, Swerea, KIMAB.
2015 (English)In: 2015 IEEE International Ultrasonics Symposium, IUS 2015, Institute of Electrical and Electronics Engineers Inc. , 2015Conference paper, Published paper (Refereed)
Abstract [en]

Quantitative measurement of the clamping or tightening force of rods and bolts is important when assessing the structural integrity of various constructions. This paper shows that by using a bi-wave ultrasonic pulse-echo technique, it is possible to determine this tightening force without the need of extensive calibration prior to installing the bolts. We show that the ratio of the time-of-flight (TOF) between the transversal and the longitudinal waves changes linearly with the clamping force and that we only need to know the TOF of the unstrained bolt prior to installment. This is then demonstrated experimentally on a 1.1 m rock bolt, using pulses that propagated 6.6 m. Two different methods for estimation of the TOF ratio are evaluated.

Place, publisher, year, edition, pages
Institute of Electrical and Electronics Engineers Inc. , 2015.
Keywords [en]
Bolts, Clamping devices, Ultrasonic applications, Clamping Force, Compression and shear, Load bearing, Longitudinal waves, Quantitative measurement, Time of flight, Ultrasonic pulse-echo techniques, Shear flow
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-42192DOI: 10.1109/ULTSYM.2015.0079Scopus ID: 2-s2.0-84962007063ISBN: 9781479981823 (print)OAI: oai:DiVA.org:ri-42192DiVA, id: diva2:1384147
Conference
IEEE International Ultrasonics Symposium, IUS 2015, 21 October 2015 through 24 October 2015
Available from: 2020-01-09 Created: 2020-01-09 Last updated: 2020-01-09Bibliographically approved

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