PSI - Issue 33

Available online at www.sciencedirect.com Structural Integrity Procedia 00 (2020) 000 – 000 Available online at www.sciencedirect.com Science irect Structural Integrity Procedia 00 (2020) 000 – 000 Available online at www.sciencedirect.com ScienceDirect

www.elsevier.com/locate/procedia www.elsevier.com/locate/procedia

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Procedia Structural Integrity 33 (2021) 391–401

© 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 the scientific committee of the IGF ExCo Abstract To define inspection intervals that ensure the continuous and safe operation of a damage-tolerant component, such as a railway axle, a reliable estimation of its fatigue crack growth life is required. Due to the uncertainties involved in the fatigue process, inspections have to be devised not only considering the uncertainties in the performance of the inspection technique, but also based on a probabilistic lifespan prediction. From this premise, this paper presents a procedure for determination of inspection intervals that uses a conservative fatigue crack growth life estimation based on the lifespan probability distribution. A practical example to illustrate the reliability-based inspection planning methodology in a railway axle under random bending loading is given. The inspection intervals are further assessed in terms of total probability of detecting cracks in successive inspections, taking into account the probability of detection curve of the non-destructive testing technique. The procedure developed provides recommendation for the definition of inspection intervals and associated inspection techniques. © 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo IGF26 - 26th International Conference on Fracture and Structural Integrity n the use of probabilistic fatigue life esti ation in defining inspection intervals for rail ay axles C. allor a * , S. Calvo a , J.L. Núñez a , R. Rodríguez-Barrachina a , A. Landaberea b a Area of Research and Development, Instituto Tecnológico de Aragón, María de Luna, 8-50018 Zaragoza, Spain. b CAF S.A., J.M. Iturrioz, 26, Beasain, Gipuzkoa, España. Abstract To define inspection intervals that ensure the continuous and safe operation of a damage-tolerant component, such as a railway axle, a reliable estimation of its fatigue crack growth life is required. Due to the uncertainties involved in the fatigue process, inspections have to be devised not only considering the uncertainties in the performance of the inspection technique, but also based on a probabilistic lifespan prediction. From this premise, this paper presents a procedure for determination of inspection intervals that uses a conservative fatigue crack growth life estimation based on the lifespan probability distribution. A practical example to illustrate the reliability-based inspection planning methodology in a railway axle under random bending loading is given. The inspection intervals are further assessed in terms of total probability of detecting cracks in successive inspections, taking into account the probability of detection curve of the non-destructive testing technique. The procedure developed provides recommendation for the definition of inspection intervals and associated inspection techniques. 2021 The Authors. Published by ELSE IER B.V. is is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) er-review Statement: Peer-review under responsibility of the scientific committee of the IGF ExCo IGF26 - 26th International Conference on Fracture and Structural Integrity On the use of probabilistic fatigue life estimation in defining inspection intervals for railway axles C. Mallor a * , S. Calvo a , J.L. Núñez a , R. Rodríguez-Barrachina a , A. Landaberea b a Area of Research and Development, Instituto Tecnológico de Aragón, María de Luna, 8-50018 Zaragoza, Spain. b CAF S.A., J.M. Iturrioz, 26, Beasain, Gipuzkoa, España. Keywords: Probabilistic fatigue crack growth, Damage tolerance, Inspection intervals, Probability of detection, NASGRO. Keywords: Probabilistic fatigue crack growth, Damage tolerance, Inspection intervals, Probability of detection, NASGRO.

* Corresponding author. Tel.: +34-976-01-00-00; fax: +34-976-01-18-18. E-mail address: cmallor@itainnova.es * Corresponding author. Tel.: +34-976-01-00-00; fax: +34-976-01-18-18. E-mail address: cmallor@itainnova.es

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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCoClick here to enter text. 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 Statement: Peer-review under responsibility of the scientific committee of the IGF ExCoClick here to enter text.

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 the scientific committee of the IGF ExCo 10.1016/j.prostr.2021.10.047