University of Oulu

Meuronen, J., Mäntylä, A., Vaara, J., Hintikka, J., Juoksukangas, J., Lehtovaara, A., & Frondelius, T. (2020). Fretting test rig with variable normal force. Rakenteiden Mekaniikka, 53(4), 308-328.

Fretting test rig with variable normal force

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Author: Meuronen, Jaakko1; Mäntylä, Antti2; Vaara, Joona2;
Organizations: 1Tribology and Machine Elements, Faculty of Engineering and Natural Sciences Tampere University, P.O. Box 589, FI-33014, Tampere University, Tampere, Finland
2R&D and Engineering, Wärtsilä, P.O.Box 244, 65101 Vaasa, Finland
3University of Oulu, Erkki Koiso-Kanttilan katu 1, 90014 Oulun yliopisto
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 2.7 MB)
Persistent link:
Language: English
Published: Rakenteiden mekaniikan seura, 2021
Publish Date: 2021-05-17


Fretting is small amplitude reciprocating sliding between surfaces, and it may quickly causes surface cracks, which can continue growing under cyclic loads, until the structure breaks entirely as a result of the fretting fatigue. Fretting can also produce hardened wear particles as a result of adhesive wear, which then accelerates abrasive wear. In this case, the community uses the term fretting wear. The design of heavily loaded contacts, susceptible to fretting, is a difficult task because there is no generally accepted design guide. More extensive fretting research is needed to create them. This paper introduces detailed design phases for a equipment (rig) for a variable normal force fretting test. Supporting high radial and normal forces such that there is minimal run-out between the specimens was the most significant design challenge. The combination of a hydrostatic radial bearing and elastic torque shaft was selected for the detail design phase based on FE-analyses, calculations, and overall evaluation. The frame of the test rig consists of the main frame, which supports mainly the normal force and two torque frames, which support torque cylinders. Many solutions, which were found to be working in the current "ring-ring" apparatus of Tampere University, could be utilized in the new test rig like the tapered connections of the specimens, the elastic rod of the torque lever, axial displacement plate, and contact pressure adjustment system. The designed test rig enables fretting tests with 0 Hz to 20 Hz cycle frequency so that normal and tangential force or displacement can be controlled independently of each other. The normal force cannot change from compression to tension dynamically, but the adhesive force of the contact can be measured by slowly increasing the tension force. The designed fretting test rig fulfills all essential requirements, which were set.

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Series: Rakenteiden mekaniikka
ISSN: 0783-6104
ISSN-E: 1797-5301
ISSN-L: 0783-6104
Volume: 53
Issue: 4
Pages: 308 - 328
DOI: 10.23998/RM.83573
Type of Publication: A1 Journal article – refereed
Field of Science: 214 Mechanical engineering
Funding: Authors would like to acknowledge the financial support of Business Finland (former Tekes) in the form of a research projects WIMMA Dnro 1566/31/2015, MaNuMiES Dnro 3361/31/2015, ISA Wärtsilä Dnro 7734/31/2018 and ISA TAU Dnro 7204/31/2018.
Copyright information: © 2020 The Authors. Open access under license CC BY 4.0.