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Open AccessArticle

Fretting Behavior of Thermoplastic Polyurethanes

Polymer Competence Center Leoben GmbH, 8700 Leoben, Austria
Materials Science and Testing of Polymers, Montanuniversität Leoben, 8700 Leoben, Austria
Mechanical Engineering, Montanuniversität Leoben, 8700 Leoben, Austria
SKF Sealing Solutions Austria GmbH, 8750 Judenburg, Austria
Author to whom correspondence should be addressed.
Lubricants 2019, 7(9), 73;
Received: 12 July 2019 / Revised: 13 August 2019 / Accepted: 15 August 2019 / Published: 23 August 2019
(This article belongs to the Special Issue Adhesion, Friction and Lubrication of Viscoelastic Materials)
Fretting tests were conducted with five different thermoplastic polyurethanes against a steel ball. Their fretting behaviors were investigated under various test parameters, such as normal load and displacement amplitude. In order to test the sliding performances, tribological tests were conducted using a ring-on-disc setup. The results show that their fretting behaviors can be related to the dynamic mechanical properties, which were characterized by dynamic mechanical analysis (DMA). The three fretting regimes were identified by means of hysteresis and wear scar analysis. In addition, investigations were carried out until the transition regimes occurred. Different wear processes were revealed for each of the three regimes. Differences were identified using dissipated energy. The profiles of wear scars and the counterparts were analyzed using a microscope. The coefficient of friction was calculated separately for the partial slip and gross slip regimes. In the mixed fretting regime, the coefficient of friction is almost at the same level among the five materials. In the partial slip regime, however, it can be distinguished. Temperature measurements were conducted on the counterparts during the tests. Overall, the material that showed the best tribological properties also performed the best in the fretting tests. View Full-Text
Keywords: fretting; wear; fatigue; coefficient of friction; TPU fretting; wear; fatigue; coefficient of friction; TPU
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MDPI and ACS Style

Wang, C.; Hausberger, A.; Berer, M.; Pinter, G.; Grün, F.; Schwarz, T. Fretting Behavior of Thermoplastic Polyurethanes. Lubricants 2019, 7, 73.

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