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Non-destructive measurement of artificial near-surface cracks for railhead inspection
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0003-1622-5151
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.ORCID iD: 0000-0002-0188-4624
Luleå University of Technology, Department of Civil, Environmental and Natural Resources Engineering, Operation, Maintenance and Acoustics.
2019 (English)In: Insight (Northampton), ISSN 1354-2575, E-ISSN 1754-4904, Vol. 61, no 7, p. 373-379Article in journal (Refereed) Published
Abstract [en]

This paper delivers a study involving the inspection of artificial surface cracks with depths ranging from 0.25-2.5 mm from the surface and with a crack angle of 30°, which is a typical angle for surface cracks in railheads. The inspections were conducted using three different techniques: phased array ultrasonics, single-element ultrasonics and alternating current potential drop (ACPD). For the ultrasonic techniques, the study focused on employing either longitudinal or shear wave signals. In the railway industry, shallow surface cracks in railheads are caused by rolling contact fatigue (RCF). In this study, artificial defects were made, allowing the authors to explore the extent to which the ultrasonic measurement techniques can detect such defects. The negative effect of a dead zone near to the surface in the ultrasonic tests was reduced by using a wedge attachment. A discussion on the extent to which the techniques can be used in field tests was also provided. The most important result is that shallow cracks ranging from 0.25-2.5 mm were successfully characterised with acceptable accuracy. The 2.5 mm-deep crack can be measured with an accuracy of 0.8% using a 20 MHz single-element probe and with an accuracy of 3.5% using a 5 MHz phased array (64 elements, 0.6 mm pitch). The characterisations were performed using a filtering method that was developed in this study.

1675605

Place, publisher, year, edition, pages
UK: The British Institute of Non-Destructive Testing , 2019. Vol. 61, no 7, p. 373-379
Keywords [en]
near-surface cracks, artificial defect, rail, railhead, nondestructive testing, ultrasonic, phased array
National Category
Engineering and Technology Other Civil Engineering
Research subject
Operation and Maintenance
Identifiers
URN: urn:nbn:se:ltu:diva-75528DOI: 10.1784/insi.2019.61.7.373ISI: 000474598900005Scopus ID: 2-s2.0-85069039233OAI: oai:DiVA.org:ltu-75528DiVA, id: diva2:1342953
Funder
Luleå Railway Research Centre (JVTC), 1675605
Note

Validerad;2019;Nivå 2;2019-08-16 (johcin)

Available from: 2019-08-15 Created: 2019-08-15 Last updated: 2019-08-22Bibliographically approved

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Anandika, RayendraStenström, ChristerLundberg, Jan

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