Experimental characterization and modelling of triaxial residual stresses in straightened railway rails

Kaiser, Robert; Stefenelli, Mario; Hatzenbichler, Thomas; Antretter, Thomas; Hofmann, M.; Keckes, Jozef; Buchmayr, Bruno

doi:10.1177/0309324714560040

Cited by 18 publications

(11 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…the WRS field is altered in the measurement process and the measurement cannot be repeated) and are usually limited to capturing WRS in one or two directions [10][11][12][13][14][15][16]. However, these techniques can often measure much thicker engineering components [17][18][19][20] and are much less sensitive to any cross-weld microstructural or compositional variations [21]. In addition, the infrastructure required to measure WRS using stress-relief techniques is readily available relative to neutron and synchrotron sources, making them an attractive alternative in many circumstances.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of a self-equilibrium cutting strategy for the contour method of residual stress measurement

Muránsky

Hamelin

Hosseinzadeh

et al. 2018

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

An assessment of cutting-induced plasticity (CIP) is performed, by finite element (FE) prediction of the plastic strain accumulation along the cut tip when the EDM wire sections the NeT TG4 weld benchmark specimen along two cutting directions. The first direction corresponds to a conventional (C) cutting strategy, whereby the EDM wire cuts through the thickness of the weld specimen and travels in a direction transverse to the weld. The second direction corresponds to a self-equilibrating cutting (SE) strategy, whereby the EDM wire cuts across the transverse direction of the weld specimens and travels through the thickness of the plate. The cutting thus progresses simultaneously through the compression-tensioncompression regions of present weld residual stress (WRS) field. This type of cutting strategy is believed to minimize the CIP by minimising residual stress redistribution during cutting, due to stress equilibration across the sectioned material. The simulated cutting procedures are conducted under a range of clamping conditions to assess whether mechanical restraint has a primary or secondary influence on CIP accumulation. Both predictions of CIP and the resultant back-calculated WRS demonstrate that (i) mechanical restraint is the primary variable influencing CIP development, and (ii) under no circumstance does a self-equilibrating cutting strategy perform significantly better than a conventional cutting approach. The reason that self-equilibrating cuts are not effective is illustrated by calculating the Mode I (K I) stress intensity factor (SIF) along the cut tip, and correlating trends in K I to CIP development.

show abstract

Section: Introductionmentioning

confidence: 99%

Evaluation of a self-equilibrium cutting strategy for the contour method of residual stress measurement

Muránsky

Hamelin

Hosseinzadeh

et al. 2018

International Journal of Pressure Vessels and Piping

View full text Add to dashboard Cite

show abstract

“…-1307 manufacturing conditions on the fatigue strength of the material. In the literature [9][10][11][12][13][14][15], some of these issues are studied using some experimental observations, analytical calculations and FEA calculations within various contexts.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional finite element simulation of residual stresses in UIC60 rails during the quenching process

2017

View full text Add to dashboard Cite

The aim of this paper is to develop means to predict accurately the residual stresses due to quenching process of an UIC60 rail. A 3-D non-linear stress analysis model has been applied to estimate stress fields of an UIC60 rail in the quenching process. A cooling mechanism with water spray is simulated applying the elastic-plastic finite element analysis for the rail. The 3-D finite element analysis results of the studies presented in this paper are needed to describe the initial conditions for analyses of how the service conditions may act to change the as-manufactured stress field.

show abstract

“…A dynamic study with a complete rail with a simulation very similar to that made by [18] was carried out in [13]. A smaller element size was used, so the simulation took about ten days to be run.…”

Section: Rail Straightening Process Analysismentioning

confidence: 99%

“…The simulation of the straightening process consists in a dynamic process involving cyclic plasticity in a complex geometry. Reproducing this process numerically results in high computational costs, especially if explicit dynamic models are used, as was done by [13,18]. In view of this high computational cost of the explicit dynamics models, a methodology that uses a quasi-static model.…”

Section: Straightening Process Simulationmentioning

confidence: 99%

Analysis of residual stresses in rails during the straightening process

Carvalho

Rodrigues

Lins

2020

J Braz. Soc. Mech. Sci. Eng.

View full text Add to dashboard Cite

The straightening process is the main cause of residual stresses in the manufacture of rails. It is a non-trivial process with cyclic plastic loads, solid-solid contact and complex geometry, which computational simulation is often complex and timeconsuming. In this work, a new methodology was developed by means of a quasi-static modeling instead explicit dynamic. This methodology was proved to be effective and fast. Sixteen cases were simulated, and a C-shaped pattern for longitudinal stress, as seen through the literature, was obtained in the most of them, even with large variations between the main parameters: the yield strength, the tangent modulus and the initial curvature of the rail. The longitudinal normal residual stresses were higher than the transversals ones, as expected. The results obtained by simulations were the basis for the use of a Gaussian process regressor to predict the residual stresses from any initial parameters. This tool confirmed that the parameters that more affect the final state of residual stresses are, in this order, yield strength, tangent modulus and curvature. This is relevant information, since the hardest data to obtain in practice are the initial curvature of rail. Both simulation methodology and the statistical Gaussian process tool could be useful to perform life fatigue analysis in rails, since this needs the initial state of residual stresses to be more reliable.

show abstract

Experimental characterization and modelling of triaxial residual stresses in straightened railway rails

Cited by 18 publications

References 32 publications

Evaluation of a self-equilibrium cutting strategy for the contour method of residual stress measurement

Evaluation of a self-equilibrium cutting strategy for the contour method of residual stress measurement

Three-dimensional finite element simulation of residual stresses in UIC60 rails during the quenching process

Analysis of residual stresses in rails during the straightening process

Contact Info

Product

Resources

About