Detail fracture growth in rails: Test results

Orringer, Oscar; Morris, Joseph M.; Jeong, David Y.

doi:10.1016/0167-8442(86)90019-4

Cited by 38 publications

(21 citation statements)

References 3 publications

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“…The location of crack initiation is about 10-15 mm far from the side surface of the rail which is in contact with the wheel and 6-10 mm below the rail head [20,21]. These cracks seem to propagate towards the rail surface and to behave like original surface cracks after penetration [22]. Subsurface-initiated failures are the types of failures which are focused on this paper.…”

Section: Crack Types In Railsmentioning

confidence: 99%

Fatigue crack initiation life prediction of railroad

Tehrani¹,

Saket²

2009

J. Phys.: Conf. Ser.

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Abstract. Study of multiaxial high-cycle fatigue initiation life prediction for railroad is done in this paper. Using ANSYS 11.0 software three dimensional elasto-plastic finite element model of rail/wheel contact is constructed and fine mesh technique in contact region is used to achieve both computational efficiency and accuracy. Stress analysis is performed and fatigue damage in railroad is evaluated numerically using multiaxial fatigue crack initiation model. Using the stress history during one loading cycle and fatigue damage model, the effects of vertical loading, material hardness material fatigue properties and wheel/rail contact situation on fatigue crack initiation life are investigated.

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Section: Crack Types In Railsmentioning

confidence: 99%

Fatigue crack initiation life prediction of railroad

Tehrani¹,

Saket²

2009

J. Phys.: Conf. Ser.

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“…Upper bound reference curves for rail steels are proposed by a number of authors for both mode I and mixed mode loading (see, e.g. [64,104,113,114]). …”

Section: Final Crack Propagationmentioning

confidence: 99%

Introduction to the damage tolerance behaviour of railway rails – a review

Zerbst¹,

Lundén

Edel

et al. 2009

Engineering Fracture Mechanics

176

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Despite substantial advantages in material development and in periodic non-destructive inspection together with periodic grinding and other measures in order to guarantee safe service, fatigue crack propagation and fracture is still in great demand as emphasised by the present special issue. Rails, as the heart of the railway system, are subjected to very high service loads and harsh environmental conditions. Since any potential rail breakage includes the risk of catastrophic derailment of vehicles, it is of paramount interest to avoid such a scenario. The aim of the present paper is to introduce the most important questions regarding crack propagation and fracture of rails. These include the loading conditions: contact forces from the wheel and thermal stresses due to restrained elongation of continuously welded rails together with residual stresses from manufacturing and welding in the field, which is discussed in Section 2. Section 3 provides an overview of crack-type rail defects and potential failure scenarios. Finally the stages of crack propagation from initiation up to final breakage are discussed.

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“…This model was calibrated from the original detail fracture growth test conducted on tangent track at FAST [6,7] and has been further verified and validated by comparison with results from additional experiments on curved track on the FAST High Tonnage Loop [8] and tests conducted through a joint international research effort supported by the Union of International Railways/World Executive Council [9,10]. The growth rate model estimates size progression for specified conditions, which include temperature differential.…”

Section: Defect Growthmentioning

confidence: 99%

Evaluation of Rail Test Frequencies Using Risk Analysis

Jeong

Gordon

2009

2009 Joint Rail Conference

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Several industries now use risk analysis to develop inspection programs to ensure acceptable mechanical integrity and reliability. These industries include nuclear and electric power generation, oil refining, gas processing, onshore and offshore exploration and production, chemical processing, and pipelines. Risk analysis may also be used as a decision-making tool in the railroad industry to develop systematic improvements in track maintenance and inspection strategies. In the course of conducting research in support of the Federal Railroad Administration, a Monte Carlo risk assessment model has been developed to simulate certain aspects of rail inspection (also referred to as rail testing) to find and remove defects that may grow to sufficient size to cause rail failures. In this paper, the model is used to examine the relationship between the occurrence of rail failures and various operational factors. These operational factors include rail size, average axle loading, and inspection frequency. In addition, the risk assessment model is used to evaluate an alternative rail testing concept in which detector cars would conduct inspections at speeds higher than those used in current practice.

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Detail fracture growth in rails: Test results

Cited by 38 publications

References 3 publications

Fatigue crack initiation life prediction of railroad

Fatigue crack initiation life prediction of railroad

Introduction to the damage tolerance behaviour of railway rails – a review

Evaluation of Rail Test Frequencies Using Risk Analysis

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