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Optimal Railroad Rail Grinding for Fatigue .

A collection of fatigue test data of various types of rail steel from literature is analyzed to determine a relationship between fatigue damages and number of cycles to failure. Considering a set of wheel loads with their corresponding number of rolling passage as a loading unit (LU), optimizations of grinding schedules with genetic algorithm (GA) show that fatigue life of rail increases by ...

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The blending of theory and practice in modern .

Modern rail grinding practices have developed largely through a combination of field experience and intuitive speculation. Many theories related to crack initiation and growth have been proposed through the decades, and those concepts have been cleverly extended to the field of rail grinding to form the basis of the practice known as 'preventive grinding'.

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Optimal Railroad Rail Grinding for Fatigue Mitigation - CORE

A collection of fatigue test data of various types of rail steel from literature is analyzed to determine a relationship between fatigue damages and number of cycles to failure. Considering a set of wheel loads with their corresponding number of rolling passage as a loading unit (LU), optimizations of grinding schedules with genetic algorithm (GA) show that fatigue life of rail increases by ...

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ROLLING CONTACT FATIGUE MITIGATION BY GRINDING

Today rail grinding has become a standard maintenance activity. The benefits of this operation are well known. Various grinding applications exist depending on local conditions. The treatment is related to the railhead's longitudinal profile, its cross-sectional profile, or the surface condition of the wheel-to-rail zone (or possibly a combination of these parameters). Rail surface fatigue ...

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Optimal Railroad Rail Grinding for Fatigue .

Results show that the proposed grinding schedules, optimized with the exploratory and local-search genetic algorithms, can increase fatigue life of rail by 240 percent.

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rail grinding fatigue - comonoosa.au

「Rail Grinding Best Practice」 reduces rail wear, controls rail surface fatigue and subsurface fatigue, controls rail surface plastic deformation, improves truck steering, improves the dynamic stability of rolling stock and improves rolling stock wheel life. 2.0 Rail Grinding Definitions Rail grinding is a process that is usually performed ...

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The Fatigue Life Evaluation of Continuous .

By the rail grinding, the fatigue life of CWR was evaluated in consideration to reduce the rail bending stress through removing the rail surface irregularities. Therefore, it presented the fatigue ...

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Rail Grinding and its impact on the wear of Wheels and Rails

Rail Grinding and its impact on the wear of Wheels and Rails 3 2 The wheel/rail contact As the outer rail in a curve is situated higher in a curve due to canting, it is called the "high rail". The inner rail is lower than the outer rail and is therefore called the "low rail". The inside of the rail head facing the other rail .

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Rail Grinding - L&S

For reasons of driving safety, avoidance of roll contact fatigue, and extreme stress, speed or wear situations, it can be important in some cases to use special rail profiles. Such grinding strategies are applied, for example, for anti-head-check processing, the production of asymmetrical rail profiles in areas with heavily used bends and for track corrections.

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The Fatigue Life Evaluation of Continuous .

By the rail grinding, the fatigue life of CWR was evaluated in consideration to reduce the rail bending stress through removing the rail surface irregularities. Therefore, it presented the fatigue ...

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How Much Do You Know About Rail Grinding? .

A part of load is absorbed by steel rail itself, and rest of load produce the rail wears like surface fatigue, crack, scratch, deformation and etc. Rail wears can result in reducing steel rail service life, more maintenance work, more maintenance cost and damaging railway running.

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Decision on economical rail grinding interval for ...

Rail players around the world have been increasing axle loads to improve the productivity of freight and heavy haul operations. This has increased the risk of surface cracks at curves because of rolling contact fatigue. Rail grinding has been considered an effective process for controlling these cracks and reducing risks of rail breaks. The ...

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Target Profiles for Rail Grinding: A Never Ending .

At first, rail grinding was performed to remove surface irregularities and defects — a process that required significant metal removal. During this curative process, the transverse rail profile was of secondary importance. Railways, today, have taken a preventive approach to rail maintenance — an approach in which thin layers of metal are removed at regular intervals and the transverse ...

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Rail Grinding Best Practices - AREMA

Railroads grind rail preventively to reduce rail wear, control rail surface and sub-surface fatigue, control rail surface plastic deformation to improve truck steering, improve the dynamic stability of rolling stock and improve rolling stock wheel life. This is achieved by implementing preventive grinding cycles based on track curvature and traffic tonnage to remove a thin surface layer of ...

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The Fatigue Life Evaluation of Continuous Welded .

Estimating the remaining service life of the CWR in an urban railway showed that the rail replacement period could be extended over 200MGT. In addition, comparing the concrete track to the ballast...

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Grinding and Milling are Essential for Rail Quality ...

23.01.2009 · Rail grinding helps to prevent the dangerous build-up of rolling contact fatigue, and also reduces running noise for line side communities. James Abbott, Technical Editor for Global Railway Review, assesses some developments and significant aspects of this important area of our industry. The SFU 04 milling machine from Schweerbau

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Articles - Why Rails Crack?

Metal fatigue in rails was recently highlighted as the likely cause of the Hatfield train crash. Four key members of the international research group WRISA reveal how the interactions between wheels and track led to the failure, and explains how the rail industry will need to deal with this phenomenon. The Hatfield train crash in October 2000 brought 'gauge corner cracking' to the ...

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Rolling Contact Fatigue in relation to rail .

Rail grinding has been widely recognized as an effective and general means to remove the flaws, restrain the rolling contact fatigue, improve the wheel-rail contact condition, extend the rail's ...

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Residual Stress Effects in Railroad Rail Fatigue

Based on the results from the fatigue study, an analysis of rail grinding is discussed in the context of preventing the formation of subsurface rail-head fatigue defects. Keywords: railroad rail, rolling contact, metallic fatigue, axial fatigue, critical-plane approaches, residual stresses, rail grinding . Committee/Subcommittee: E08.06 DOI: 10.1520/STP14973S ...

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Intelligent use of rail grinding | News | Railway .

Profile grinding can extend fatigue life by reducing maximum wheel/rail contact stresses and removing fatigue-damaged metal prior to the development of defects. In fact, test data suggests that profile grinding has the potential to extend the fatigue life of curve rail into the 300 to 400MGT range7. This would represent a further doubling of rail life, with major economic benefits.

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