? 2022 Elsevier LtdThis paper presents the failure analysis of the pivot of a metro train. For this purpose, two pivots that contained cracks were analyzed. The cracks were detected during rutinary non-destructive liquid penetrant testing, which is schedule within the maintenance routine. For the failure analysis the material of the pivots was characterized to determine its chemical composition, microstructure and hardness. Additionally, fractographic analysis was accomplished by visual observation and scanning electron microscopy. Finally, a model of the stress state of the pivot was developed, which allowed determining the areas of highest stress and computing the fatigue life. The failure analysis showed that cracking was due to a fatigue phenomenon that exhausted the life of the component. Also, catastrophic failure was prevented by the non-destructive rutinary inspection.
Failure analysisFatigue failureLiquid penetrant non-destructive testingMetro train systems
Aristizabal-Sierra R.、Marcelo Rojas-Arango J.、Maria Perez-Ceballos A.、Lenin Chica-Arrieta E.
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Gipimme Departamento de Ingeniería de Materiales Facultad de Ingeniería Universidad de Antioquia
Grupo de Investigación en Desarrollo y Tecnología de Nuevos Materiales (GIMAT) Escuela de Ingeniería Metalúrgica y Ciencia de los Materiales Universidad Industrial de Santander
Grupo de Energías Alternativas (GEA) Departamento de Ingeniería Mecánica Bloque 20 Oficina 444 Facultad de Ingeniería Universidad de Antioquia UdeA
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Elsevier
