PSI - Issue 37

ScienceDirect Available online at www.sciencedirect.com Science irect Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com Procedia Structural Integrity 37 (2022) 582–589 Structural Integrity Procedia 00 (2019) 000 – 000

www.elsevier.com/locate/procedia

www.elsevier.com/locate/procedia

© 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 Pedro Miguel Guimaraes Pires Moreira Abstract A twin-roller fatigue test rig was used to reproduce the process of the coexistence of fatigue crack initiation and wear growth in the specimens from rail specimens. Based on the test rig situation, a prediction model was established according to the prediction method for coexistence of crack initiation and wear growth in rail. Both the results, including wear, crack initiation position and crack length in the specimens by the test and simulation were analyzed for verifying prediction model. The results show that there are many states such as micro-pores and micro-cracks on the contact surface at the same time. The crack initiation position is about 0.031mm from the worn contact surface, which is basically consistent with the experimental observation results. The surface crack length distribution is basically the same, distribution in 0.10~0.35mm. The predicted method of the coexistence of the crack initiation and wear growth is feasible. Keywords: rail; twin-roller fatigue test; wear; crack initiation; Surface micro morphology 1. Introduction The rolling contact fatigue (RCF) cracks and wear on the surface of the rail are the main damages that affect the life of the rail. The main manifestations of the rolling contact fatigue of the rail are surface cracks on the rail head, peeling off pieces or damage to the gauge angle (flaking, hidden damage, nuclear damage, honeycomb cracks) etc (Zhang Yi, 2016). With the increase of heavy-haul technologies axle load and the continuous increase of cargo Abstract A twin-roller fatigue test rig was used to reproduce the process of the coexistence of fatigue crack initiation and wear growth in the specimens from rail specimens. Based on the test rig situation, a prediction model was established according to the prediction method for coexistence of crack initiation and wear growth in rail. Both the results, including wear, crack initiation position and crack length in the specimens by the test and simulation were analyzed for verifying prediction model. The results show that there are many states such as micro-pores and micro-cra ks on the contact surface at the same time. The crack nitiatio position is about 0.031mm from the worn contact surface, which is basically consistent with he experimental observation results. The surface rack length distribution is basically the s me, distribution in 0.10~0.35mm. The predicted method of the oexistence of the cr ck initiatio and wear growth is feasible. Keywords: rail; twin-roller fatigue test; wear; crack initiation; Surface micro morphology 1. In roduction The rolling contact fatigue (RCF) cracks and wear on the surface of the rail are the main damages that affect the life of the rail. The main manifestations of the rolling contact fatigue of the rail are surface cracks on the rail head, peeling off pieces or damage to the gauge angle (flaking, hidden damage, nuclear damage, honeycomb cracks) etc (Zhang Yi, 2016). With the increase of heavy-haul technologies axle load and the continuous increase of cargo ICSI 2021 The 4th International Conference on Structural Integrity Experimental study on the mechanism of wheel-rail steels crack initiation and wear growth under rolling contact fatigue Junpeng Li a,b , Yu Zhou a,b* , Zhechao Lu a,b , Zheng Wang a,b Zhongning Cheng a,b , Shiye Wang a,b ICSI 2021 The 4th International Conference on Structural Integrity Experimental study on the mechanism of wheel-rail steels crack initiation and wear growth unde rolling contact fatigue Junpeng Li a,b , Yu Zhou a,b* , Zhechao Lu a,b , Zheng Wang a,b Zhongning Cheng a,b , Shiye Wang a,b a The Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, No. 4800, Cao'an Road, Shanghai, 201804, China a The Key Laboratory of Road and Traffic Engineering of the Ministry of Education, Tongji University, No. 4800, Cao'an Road, Shanghai, 201804, China b Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, No. 4800, Cao'an Road, Shanghai, 201804, China b Shanghai Key Laboratory of Rail Infrastructure Durability and System Safety, Tongji University, No. 4800, Cao'an Road, Shanghai, 201804, China

* Corresponding author. Yu Zhou E-mail address: ljpjunpengli@163.com

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 Pedro Miguel Guimaraes Pires Moreira 10.1016/j.prostr.2022.01.126 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 Pedro Miguel Guimaraes Pires Moreira 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 Pedro Miguel Guimaraes Pires Moreira * Corresponding author. Yu Zhou E-mail address: ljpjunpengli@163.com