Characterization of cracks formed in large flat-on-flat fretting contact
Juoksukangas, Janne; Nurmi, Verner; Hintikka, Jouko; Vippola, Minnamari; Lehtovaara, Arto; Mäntylä, Antti; Vaara, Joona; Frondelius, Tero (2019-03-04)
Janne Juoksukangas, Verner Nurmi, Jouko Hintikka, Minnamari Vippola, Arto Lehtovaara, Antti Mäntylä, Joona Vaara, Tero Frondelius, Characterization of cracks formed in large flat-on-flat fretting contact, International Journal of Fatigue, Volume 124, 2019, Pages 361-370, ISSN 0142-1123, https://doi.org/10.1016/j.ijfatigue.2019.03.004
© 2019 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/BY/4.0/).
https://creativecommons.org/licenses/by/4.0/
https://urn.fi/URN:NBN:fi-fe2019071022973
Tiivistelmä
Abstract
Fretting fatigue may lead to severe damage in machines. Adhesive material transfer spots in millimeter scale have previously been observed on fretted surfaces, which have been related to cracking. In this study, fretting-induced cracks formed in a large annular flat-on-flat contact are characterized. Optical and scanning electron microscopy of the fretting scar cross-section samples of self-mated quenched and tempered steel specimens revealed severe cracking and deformed microstructure. Two major cracks typically formed around an adhesion spot, which propagated at an oblique angle, regardless of the test parameters used. Millimeter-scale cracks were observed already within a few thousand loading cycles.
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