PSI - Issue 42

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

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Procedia Structural Integrity 42 (2022) 1128–1136

© 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 Abstract An accurate method for estimating high-cycle fatigue for shaft – hub connections is desired for safe machine design. Especially in drive-train applications, different multiaxial loads act on the joined parts. The resulting multiaxial stress state near the contact edge as well as the corresponding tribological state influence the fatigue strength in high-cycle fatigue regime. Investigating different load parameters, staircase fatigue experiments were performed under conditions of combined rotating bending and dynamic torsion of shrink-fitted shaft – hub connections with pairings of like materials. The comparison of normalized C45+N steel with quenched and tempered 42CrMo4+QT steel in particular revealed a difference in sensitivity to tribological stress. Where material strength is greater, greater loads lead to greater relative motion between shaft and hub, as well as more variation in contact pressure due to bending. This greater tribological stress leads to more extensive surface degradation and crack initiation occurs at lower loads compared to the higher material strength. To consider these effects in the fatigue calculation, integral fatigue criteria are used to determine the critical distance where the equivalent stress should be evaluated (Fig. 1). Due to crack-closing compressive loads caused by the contact pressure, greater critical distances (point method) were determined than are known for free surface cracks in the literature using the finite element method. The empirically determined material sensitivity could not be reproduced by adaptating the critical distance for the quenched and tempered steel. © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23 Keywords: fretting fatigue, multiaxial fatigue, material sensitivity, fatigue experiments, fatigue modelling, integral criterium chine design. 0 T i Keywords: fretting fatigue, multiaxial fatigue, material sensitivity, fatigue experiments, fatigue modelling, integral criterium 23 European Conference on Fracture - ECF23 Fretting fatigue of multiaxially loaded shrink-fit connections – the effect of material sensitivity on fatigue strength Lukáš Suchý *, Denny Knabner, Alexander Hasse Technische Universität Chemnitz, 09107 Chemnitz, Germany Institut of Design Engineering and Drive Technology

*Corresponding author. Tel.: +49 371 531 32446; fax: +49 371 531 832446. E-mail address: lukas.suchy@mb.tu-chemnitz.de

2452-3216 © 2020 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) Peer-review under responsibility of 23 European Conference on Fracture - ECF23

2452-3216 © 2022 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of the scientific committee of the 23 European Conference on Fracture – ECF23 10.1016/j.prostr.2022.12.144