Modeling surface rolling contact fatigue crack initiation taking severe plastic shear deformation into account

Trummer, Gerald; Marte, Christof; Dietmaier, Peter; Sommitsch, Christof; Six, Klaus

doi:10.1016/j.wear.2016.02.008

Cited by 45 publications

(36 citation statements)

References 14 publications

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“…Rails of this grade are fully pearlitic. The hardness at the rail head is increased by faster cooling after the rolling process [37] and accounts in this way for better resistance to wear and rolling contact fatigue [38,39]. The chemical composition and hardness at the running surface of the steel is given in Table 1.…”

Section: Used Materialsmentioning

confidence: 99%

Thermo-metallurgically coupled numerical simulation and validation of multi-layer gas metal arc welding of high strength pearlitic rails

2018

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A 3D transient thermo-metallurgical finite element simulation of a narrow gap multi-layer gas metal arc welding of the first ten layers of a 60E1 profile and R350HT steel rail was implemented in SYSWELD ® to study the evolution of the temperature field, phase fractions, and the hardness in the heat-affected zone. For validation, T (t) curves and metallography samples from corresponding instrumented welding experiments were used. Good agreement was reached for what concerns the results of the simulated temperature field and phase transformations. An inhomogeneous evolution of the temperature field throughout the welded layers as a result of the rail's geometry and welding sequence could be depicted. Based on the simulation results, preheating is believed necessary in order to fully avoid the formation of undesirable Bainite fractions. The hardness simulation showed good results in sidewise locations with regard to the rail cross section and closer to the line of fusion. However, results were less accurate in the middle of the rail cross section and the more the comparison points approached the so called soft zone at the outer border of the heat affected zone and the base material.

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Section: Used Materialsmentioning

confidence: 99%

Thermo-metallurgically coupled numerical simulation and validation of multi-layer gas metal arc welding of high strength pearlitic rails

2018

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“…3. Virtual Vehicle-a railway research consortium based in Austria-has analyzed pummelling data 55 through its strain-based damage prediction model to predict intensity and directionality of damage on a rail using the plots shown in Figure 19, 56 where the prediction of crack direction and location of most severe cracking is very good.…”

Section: Multiple Tangent Rail Shapesmentioning

confidence: 99%

Designing and assessing wheel/rail profiles for improved rolling contact fatigue and wear performance

Magel

Kalousek

2017

Proceedings of the Institution of Mechanical Engineers, Part F:

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A quick survey of wheel and rail profiles used around the world reveals a huge range of options. Wheels come in cylindrical, conical, and concave variations, while rails range in shape from a very flat 14 in. (350 mm) head radius to a tightly crowned 6 in. (150 mm) head radius. The rationale for implementing one or the other is often institutional inertia-a strong tendency to continue doing what has been done in the past. But the impacts of wheel and rail profiles on the performance of the vehicle/track interaction are large and the decision should not be made lightly. Unfortunately, there are few well-matched ''off-the-shelf'' solutions from the existing commercially available profiles, such that new rails and wheels often suffer early failures or infant mortality. Through examples and case studies, this paper discusses the significant role that wheel and rail profiles play with respect to performance and safety and makes the case for wheel and rail profiles specifically suited to the needs of each railway. Various techniques for assessing the performance of systems of wheels and rails are reviewed and discussed.

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“…Also a very significant reason to succeed is to have a rigorous view upon the surface boundaries no matter the chosen approach: either a point interpolation which will take into account the curve radiuses of the considered boundaries or an approach based on the consideration that limits are used for cutting through the overlapped and contour fitted surface [3]. The method proposes a procedure for point detection that is representing the boundaries.…”

Section: The Triangulation Proceduresmentioning

confidence: 99%

Aspects to be considered in case of variable surfaces modelling

2017

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Abstract. Proper triangulation will bring benefits regarding the numerical conditioning of nodes within the point cloud but will also allow certain nodes to be able to move around those that are neighboring them. In this way, surface features as chained regions or curves will have a certain degree of freedom which will allow them to slide one towards another. At a more careful evaluation there is a major drawback in terms of lack of possibility to take into consideration the operations which depend upon approximate shapes inside the ideal shape evaluation process. In order to be able to control the accuracy of the process there is an impetuous need for all surfaces to be described functionally. Any triangulation procedure has to be able to allow control over the analyzed surface topology and any other after modifications: dividing the surface along an incorporated curve in order to define a new edge or sticking two surfaces together in order to form a mutual boundary edge.

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Modeling surface rolling contact fatigue crack initiation taking severe plastic shear deformation into account

Cited by 45 publications

References 14 publications

Thermo-metallurgically coupled numerical simulation and validation of multi-layer gas metal arc welding of high strength pearlitic rails

Thermo-metallurgically coupled numerical simulation and validation of multi-layer gas metal arc welding of high strength pearlitic rails

Designing and assessing wheel/rail profiles for improved rolling contact fatigue and wear performance

Aspects to be considered in case of variable surfaces modelling

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