Experimental Study on Rail/Wheel Wear for Various Contact Conditions

2017 ◽  
Vol 2017.26 (0) ◽  
pp. 3203
Author(s):  
Kei OKUMURA ◽  
Yoshiaki TERUMICHI ◽  
Yasuhiro SATO ◽  
Hiroyuki OHNO ◽  
Katsuyuki TAKAHASHI ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wheel Wear ◽  
Contact Conditions

Use of Archard’s Wear Law for the Calculation of Uniform Wheel Wear of High Tonnage Freight Vehicles

2013 ◽  
Author(s):  
Carlos Casanueva ◽  
Per-Anders Jönsson ◽  
Sebastian Stichel
Keyword(s):  
Contact Point ◽  
Wheel Wear ◽  
Contact Conditions ◽  
Passenger Vehicles ◽  
Calculation Methodology ◽  
Wear Calculation ◽  
Wheel Profile ◽  
Wear Law ◽  
Equivalent Conicity ◽  
Freight Vehicles

Wheel profile evolution has a large influence on track and wheelset related maintenance costs. It influences important parameters such as equivalent conicity or contact point positioning, which will affect the dynamic behavior of the vehicle, in both tangent track and curve negotiation. High axle loads in freight wagons may increase both the wheel wear and the damage caused by vehicles with both new and already worn profiles. A common profile in Europe is the S1002 profile, developed for rail inclination 1/40. In Sweden rail inclination is 1/30, so contact conditions might not be optimal. The presented work uses Archard’s wear law to analyze the profile wear evolution in a two axle freight vehicle with Unitruck running gear on the Swedish network. This wear calculation methodology has been successfully used to predict uniform wear in passenger vehicles. First, the vehicle model has been optimized in order to improve the speed of the wear simulations. Experimental measurements of wheel profiles have been performed in order to validate the simulations. The conclusion is that the wear methodology successfully used to predict uniform wheel wear in passenger vehicles cannot be directly applied for the calculation of wheel profile evolution in high tonnage freight vehicles. The influence of block brakes or switches and crossings cannot be dismissed when calculating uniform wheel wear in these cases.

Experimental study of the friction of ice over concrete under simplified ice–structure interaction conditions

2002 ◽  
Vol 29 (3) ◽  
pp. 347-359 ◽  
Author(s):  
Bruno Fiorio ◽  
Jacques Meyssonnier ◽  
Marc Boulon
Keyword(s):  
Experimental Study ◽  
Simple Model ◽  
Contact Interaction ◽  
Contact Conditions ◽  
Friction Coefficients ◽  
Friction Law ◽  
Structure Interaction ◽  
Physical Mechanisms ◽  
Concrete Plates

Cyclic friction tests between laboratory grown columnar ice and micro-concrete plates were performed at –10°C to study ice–concrete friction under conditions similar to those observed in ice–structure interactions. This paper presents the results obtained in terms of friction coefficients. Effects of time and contact conditions are analysed, and conclusions about the effective physical mechanisms of friction are drawn. These conclusions are validated by a simple model of the ice–concrete contact.Key words: ice, structure, concrete, contact, interaction, friction, law, model, viscoplasticity, roughness.

Prozessüberwachung beim Spitzenlosschleifen/Process monitoring during centerless grinding - Use of vibration sensor technology for detecting wear-related changes in contact conditions

2021 ◽  
Vol 111 (06) ◽  
pp. 390-396
Author(s):  
Andreas Blum ◽  
Jannik Röttger ◽  
Raphael al Diban ◽  
Christian Weickhardt ◽  
Mathias Rudolph ◽  
...  
Keyword(s):  
Process Monitoring ◽  
Vibration Sensor ◽  
Vibration Monitoring ◽  
Sensor Technology ◽  
Grinding Wheel ◽  
Wheel Wear ◽  
Contact Conditions ◽  
Grinding Wheel Wear ◽  
Centerless Grinding ◽  
Grinding Machines

Der konstruktive Aufbau von Spitzenlosschleifmaschinen erschwert die Implementierung von Sensorik zur Prozessüberwachung. Daher wird ein Sensorsystem zur Schwingungsmessung beim Spitzenlosschleifen vorgestellt, das auch zur Nachrüstung von Bestandsmaschinen geeignet ist. Die erfassten Daten während spitzenlosen Einstechschleifversuchen korrelierten in guter Näherung mit schleifscheibenverschleißbedingten Änderungen der Werkstückeigenschaften.   The design of centerless grinding machines makes it difficult to apply suitable sensors for process monitoring. This paper presents a sensor system for vibration monitoring during centerless grinding, which can also be used for retrofitting existing machines. The data recorded during centerless plunge grinding correlated in a good aproximation with changes in the workpiece properties related to grinding wheel wear.

An Experimental Investigation of the Effects of Microencapsulated Phase Change Material in Grinding Fluid Performance

1999 ◽  
Author(s):  
Jae M. Lee ◽  
Chi-Hung Shen
Keyword(s):  
Experimental Study ◽  
Phase Change ◽  
Phase Change Material ◽  
Metalworking Fluids ◽  
Wheel Wear ◽  
Significant Deterioration ◽  
The Third ◽  
Microencapsulated Phase Change Material ◽  
Change Material ◽  
High Shearing

Abstract This report documents an experimental study in the evaluation of the grinding performance of three metalworking fluids containing Microencapsulated Phase Change Material (MPCM) slurry. The results showed that wheel wear and surface finish were improved substantially in two cases while the performance became worse for the third fluid. There was significant deterioration of the microparticles because of the high shearing action of the circulating pump.

10409 Experimental study on rail wheel wear

2013 ◽  
Vol 2013.19 (0) ◽  
pp. 59-60
Author(s):  
Nonoka ADACHI ◽  
Hirotaka MORI ◽  
Yasuhiro SATO ◽  
Katsuyuki TAKAHASHI ◽  
Yasushi OKA ◽  
...  
Keyword(s):  
Experimental Study ◽  
Wheel Wear

Changes in Surface Topography with Running-In

1968 ◽  
Vol 183 (16) ◽  
pp. 57-65 ◽  
Author(s):  
R. Østvik ◽  
H. Christensen
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Surface Topography ◽  
Mixed Lubrication ◽  
Contact Conditions ◽  
Line Contacts

The paper will describe the results of an experimental study of changes in surface roughness and contact conditions as running-in and wear take place. Line contacts under conditions of mixed lubrication in both sliding and sliding with rolling have been studied.

Experimental Study on Grinding of a Nickel-Based Alloy Using Vitrified CBN Wheels

2011 ◽  
Vol 325 ◽  
pp. 134-139 ◽  
Author(s):  
Zhong De Shi ◽  
Amr Elfizy ◽  
Benoit St-Pierre ◽  
Helmi Attia
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Material Removal ◽  
Removal Rate ◽  
Wheel Wear ◽  
Creep Feed ◽  
Nickel Based Alloy ◽  
Specific Material ◽  
Grinding Power ◽  
Vitrified Cbn

An experimental study is reported on the grinding of a nickel-based alloy using vitrified CBN wheels. This work was motivated by switching the grinding of fir-tree root forms of jet engine blades from creep-feed grinding with conventional abrasive wheels to vitrified CBN wheels. The objective is to explore process limits and practical grinding parameters for judging the switch in terms of overall costs and productivity. Straight surface grinding experiments were conducted with water-based fluid on rectangular blocks at a fixed wheel speed vs = 45 m/s, various depths of cut a = 0.05 - 1.0 mm, and workspeeds vw = 2 - 40 mm/s. Grinding power, forces, surface roughness, and radial wheel wear were measured. Specific material removal rate of 8 mm3/(mm.s) was reached in rough grinding using a wheel dressed for achieving surface roughness Ra = 0.8 µm in finish grinding. It was found that shallow depths of cut combined with fast workspeeds, or less creep-feed modes, are more suitable for achieving high material removal rates with vitrified CBN grinding. Rough grinding is restricted by high grinding temperatures with newly dressed wheels and by chatters with worn wheels.

An Experimental Study of Some of the Factors Affecting the Contact Conditions and the Slip between a Rolling Ball and Its Track

1967 ◽  
Vol 182 (1) ◽  
pp. 757-768 ◽  
Author(s):  
J. Hailing ◽  
M. A. Al-Qishtaini
Keyword(s):  
Experimental Study ◽  
Surface Roughness ◽  
Wear Debris ◽  
Normal Load ◽  
Operating Conditions ◽  
Hydrodynamic Effect ◽  
Contact Conditions ◽  
Factors Affecting ◽  
Rolling Ball ◽  
Theoretical Considerations

The problem of a rolling ball subjected to combined normal load and tangential tractions has been studied for a variety of operating conditions. It is shown that for dry steady state loading the resultant slip may be explained in terms of a microslip theory based on the differential elastic straining of the ball and the track. Such results necessitate a careful experimental technique in which the surfaces must be free from contamination and loose wear debris. It is also shown that the preceding arguments are not significantly affected by dynamically varying loads or by speed variations in the range 0-150 in/min. The slip behaviour is found to be markedly affected by the presence of a lubricant. The behaviour with load and speed now indicates a definite hydrodynamic effect, although the theoretical film thickness is considerably less than the surface roughness. These results agree well with the results of other investigations for similar conditions. Using these experimental results and theoretical considerations a tentative power law formulation for the slip under such conditions is proposed.

Process Parameters and Residual Stresses in Cylindrical Grinding

2002 ◽  
Vol 124 (3) ◽  
pp. 615-623 ◽  
Author(s):  
Edoardo Capello ◽  
Quirico Semeraro
Keyword(s):  
Experimental Study ◽  
Residual Stresses ◽  
Process Parameters ◽  
Feed Rate ◽  
Depth Of Cut ◽  
Wheel Wear ◽  
Cylindrical Grinding ◽  
Grinding Conditions ◽  
Joint Parameters ◽  
The Relationship

The paper presents an experimental study on the relationship between process parameters and residual stresses in cylindrical grinding. In particular, the influence of the depth of cut (a) and the peripheral velocity of the workpiece vw was investigated. Residual stresses were found to depend on both parameters, but the effect of the peripherial velocity depends on the grinding conditions. In “easy to grind” conditions an increase in workpiece velocity leads to an increase in residual stresses, but in “difficult to grind” conditions an increase in workpiece velocity results in a decrease in residual stresses. Consequently, two joint parameters, Zw=as˙vw, and Kw=a/vw, were used to predict residual stresses. Regression analysis was then performed to determine the analytic relationship between the joint parameters and the residual stresses in “easy” and “difficult” grinding conditions. Finally, the influence of wheel wear, feed rate, sparkout and wheel dressing was investigated. The study showed that the workpiece feed rate does not seem to influence the residual stresses, while sparkout, wheel wear, and wheel dressing significantly affect the level of residual stresses generated during machining.

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