PSI - Issue 39

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

www.elsevier.com/locate/procedia

ScienceDirect

Procedia Structural Integrity 39 (2022) 313–326

© 2021 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 CP 2021 – Guest Editors Abstract A new non-standard experiment is developed to measure fatigue crack propagation in the shear crack growth mechanism occurring in rail and crossing parts. Pre-cracked tubular specimens are loaded under cyclic Mode-II and static compressive Mode-I stresses to reproduce those shear crack growth conditions. To investigate the influence of severe plastic deformation as found in the top of rails in track, specimens are pre-deformed using high pressure torsion. For the pearlitic rail steel, the crack path and crack growth behavior changes distinctively with material pre-deformation: In the undeformed material cracks bifurcate under the Mode-II loading and turn into a Mode-I dominated mixed-mode. After severe plastic deformation, the crack propagates in Mode-II at significantly lower load levels without bifurcating. A detailed analysis of the fracture surfaces as well as the correlation of the crack path and microstructural alignment confirm these findings. Therefore, the proposed experimental procedure could provide Mode II fatigue crack growth data required to predict crack propagation within rolling contact fatigue in rails and crossings. © 2021 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 CP 2021 – Guest Editors Keywords: rolling contact fatigue; wheel-rail contact; high pressure torsion; shear crack growth 2 u 7th International Conference on Crack Paths Fatigue crack growth of deformed pearlitic rail steels under multiaxial loading Georg Schnalzger a *, Jürgen Maierhofer a , Werner Daves a , Reinhard Pippan b , Anton Hohenwarter c a Materials Center Leoben Forschung GmbH, Roseggerstrasse 12, A-8700 Leoben, Austria b Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, A-8700 Leoben, Austria c Department of Materials Science, Chair of Materials Physics, Montanuniversität Leoben, Jahnstrasse 12, A-8700 Leoben, Austria Georg Schnalzger a Hohenwarter

* Corresponding author. Tel.: +43 3842 459 2282 E-mail address: georg.schnalzger@mcl.at

2452-3216 © 2021 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 CP 2021 – Guest Editors

2452-3216 © 2021 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 CP 2021 – Guest Editors 10.1016/j.prostr.2022.03.101