PSI - Issue 23

Available online at www.sciencedirect.com

ScienceDirect

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 23 (2019) 185–190

© 2019 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 the scientific committee of the ICMSMF organizers Residual stresses play an important role in propagation of potential fatigue cracks and they influence residual fatigue lifetime of railway axles. Essential step for assessment of residual fatigue lifetimes of railway axles is determination of magnitudes and distribution of residual stress in axle. This paper deals with determination of tangential residual stress in hardened railway axle made of EA4T steel. The tangential stress is obtained from difference between uncut and cut slit ring specimens, which are manufactured from considered railway axle. Then, based on theory of curved beams, stress distribution in the cylindrical specimen is calculated. Finally, results from slit ring method are compared with results of neutron and x-ray diffraction. 1 9 The Authors. Published by Elsevier B.V. is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/) r-review under responsibility of th scientific committe of the IC MSMF organizers. Keywords: Residual stress; slit ring method; finite element method; railway axle 1. Introduction Railway axles are subjected to environmental changes and cyclic loading with variable amplitude. Therefore, it is not possible to neglect small surface and sub-surface defects which can lead to fatigue crack initiation (Zerbst et al. i e e 9th International Conference on Materials Structure and Micromechanics of Fracture Methodology for estimation of residual stresses in hardened railway axle Pavol Dlhý a,b *, Jan Poduška a,c , Pavel Pokorný a , Luboš Náhlík d , Rostislav Fajkoš e , Pavel Hutař a a Institute of Physics of Materials AS CR, v.v.i., Žižkova 513/22, 616 62 Brno, Czech Republic b CEITEC - Brno University of Technology, Purkyňova 656/123, 612 00 Brno, Czech Republic c Facu lty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, 616 69 Brno, Czech Republic d CEITEC - Institute of Physics of Materials, Purkyňova 656/123, 612 00 Brno, Czech Republic e BONATRANS GROUP, a. s., Revoluční 1234, 735 94 Bohumín, Czech Republic Ja d e H a Abstract

* Corresponding author. Tel.: +420 532 290 347 E-mail address: dlhy@ipm.cz

2452-3216 © 2019 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 the scientific committee of the IC MSMF organizers.

2452-3216 © 2019 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 the scientific committee of the ICMSMF organizers 10.1016/j.prostr.2020.01.084