Fatigue and the railways: an overview

Smith, R.A.

doi:10.1533/9781845697020.1

Cited by 3 publications

(4 citation statements)

References 11 publications

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“…Fatigue degradation on these regions can develop at different points of the rail depending on the underlying trigger [18,32,33]. Due to the improvements in the steel manufacturing process, the degradation induced by internal inclusion or hydrogen shrinkage defects is not an issue anymore and failure is more related now with fatigue evolution on railheads, i.e.…”

Section: Straight Sectionmentioning

confidence: 99%

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On the numerical study of fatigue process in rail heads by means of an isotropic damage based high-cycle fatigue constitutive law

Jiménez

Barbu

Oller

et al. 2022

Engineering Failure Analysis

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Section: Straight Sectionmentioning

confidence: 99%

“…the rolling area. The predominant phenomenon is known as rolling contact fatigue (RCF) [32,34,35] which is produced by the normal wheel rolling along the rail. This means that the associated degradation can potentially appear at any point of the rail track although those areas with higher stress concentration, e.g.…”

Section: Straight Sectionmentioning

confidence: 99%

On the numerical study of fatigue process in rail heads by means of an isotropic damage based high-cycle fatigue constitutive law

Jiménez

Barbu

Oller

et al. 2022

Engineering Failure Analysis

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“…Investigations of in‐service failures show that more than 80% of the failures in rotating steel components are directly or indirectly related to fatigue . The casualties such as Versailles train accident in 1842, Norwegian Service Flight 451 accident in 1997, or “Ride the Ducks” crash in 2015 are all addressed to the unexpected failure of load‐carrying steel axles . International safety regulations provided by associations such as ERA and UIC aim to ensure structural reliability throughout entire service life in modern engineering applications.…”

Section: Introductionmentioning

confidence: 99%

Effect of microstructural modification on damage tolerance of 34CrMo4 shaft steel

Ozcan

Gür

2020

Fatigue Fract Eng Mat Struct

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Overall damage tolerances of the heat-treated 34CrMo4 steels having ferriticpearlitic, bainitic, and tempered-martensitic microstructures were evaluated based on their threshold stress intensity factor prior to small crack propagation, fatigue strength, and fracture toughness under static loading. Kitagawa-Takahashi diagrams were constructed to determine the limiting size of small crack propagation. The micromechanical effects of carbide morphology and

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“…Neste contexto, um material solicitado ciclicamente por um carregamento capaz de exceder o limite de escoamento do material pode passar a oscilar elasticamente após alguns ciclos. A este comportamento, dá-se o nome de shakedown elástico (Smith, 1990;Willians, 2005).…”

Section: Lista De Símbolos E Abreviaturasunclassified

Estudo da vida em fadiga de trilhos ferroviários sob solicitações de rolamento aleatórias

Costa¹

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The current work presents a study of fatigue life of rails by applying multiaxial fatigue models, considering the residual stresses due to the cyclical wheel loads in different positions and directions. For that, a rail of heavy haul railway applications used in in Brazil was modeled using the finite element method and ABAQUS ® software. A model was developed by applying nodal forces obtained analytically with the theories of contact of both Hertz and Linear of Kalker. The nodal forces patch represents the rolling passes of the wheel along the rail in different straight lines and directions. For purposes of comparison, a model with pure rolling was also analyzed, in this case always passing in a straight line along the rail. To obtain the nodal forces, the finite element mesh generated in the ABAQUS ® software was imported by a program in MATLAB ® , where the efforts were calculated at each moment, associated with the node, and exported again for the ABAQUS ® as an input. Static analyzes were then made, simulating successive load applications during the rolling of a wheel on the rail. The stresses and strains variation in elements of a cross section of the rail were then analyzed aiming to identify the elastic shakedown phenomenon, since the presence or not of this phenomenon will guide the study of the life under fatigue. The stress and strain tensors, which are inputs to the fatigue criteria implemented, were exported back to the program in MATLAB ® . The methodology involved the application of low and high-cycle multiaxial fatigue criteria for a large number of points of a rail cross-section, each analyzed in 144 different planes, followed by the selection of the critical point and plane, according to each criterion. For this point and plane, the number of cycles necessary for crack nucleation was estimated. The results showed that the shakedown is reached after a few cycles. When the direction of the wheel passages is reversed, the shakedown appears again. After eight-wheel passes, the stabilization is once again achieved, remaining unchanged until the end of the simulation, even after further reversals of the wheel passages. Thus, when the rail was requested by loads so that the shakedown regime has already been reached, the stabilization is not affected. Besides, applications with tangential stresses influenced the distribution of equivalent stress and strain. For pure rolling, the distribution of equivalent stresses and strains presents lower stress and strains at the surface, and maximums in depths of about 3 mm. For the case where tangential stresses were considered, the distribution of stresses and strains for all analyzed fatigue criteria, showed an increase close to the surface.

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Fatigue and the railways: an overview

Cited by 3 publications

References 11 publications

On the numerical study of fatigue process in rail heads by means of an isotropic damage based high-cycle fatigue constitutive law

On the numerical study of fatigue process in rail heads by means of an isotropic damage based high-cycle fatigue constitutive law

Effect of microstructural modification on damage tolerance of 34CrMo4 shaft steel

Estudo da vida em fadiga de trilhos ferroviários sob solicitações de rolamento aleatórias

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