A numerical study on the fatigue and rolling contact fatigue behaviour of PVD-coated steel and titanium spur gears

2009 ◽  
Vol 27 (2) ◽  
pp. 127-137 ◽  
Author(s):  
Sergio Baragetti ◽  
Federico Tordini
Keyword(s):  
Numerical Study ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Fatigue Behaviour ◽  
Rolling Contact ◽  
Spur Gears ◽  
Coated Steel

Contact Fatigue Crack Growth in PVD-Coated Spur Gears

2009 ◽  
Vol 417-418 ◽  
pp. 797-800 ◽  
Author(s):  
Sergio Baragetti ◽  
Stefano Cavalleri ◽  
Federico Tordini
Keyword(s):  
Numerical Models ◽  
Rolling Contact Fatigue ◽  
Stress Gradient ◽  
Contact Fatigue ◽  
Numerical Procedure ◽  
Deposition Process ◽  
Fatigue Behaviour ◽  
Rolling Contact ◽  
Spur Gears ◽  
Contact Fatigue Resistance

The aim of this work is to investigate the (rolling) contact fatigue behaviour of transmission spur gears coated with PVD (Physical Vapour deposition) thin hard films. Numerical models of coated steel and titanium spur gears were developed. The effect of the residual stress gradient induced by the coating deposition process was considered in the calculations. A theoretical-numerical procedure was arranged to foresee the crack propagation direction. Such a procedure could represent a powerful tool to predict the (rolling) contact fatigue resistance of PVD-coated gears.

A Comprehensive Study of the Performances of PVD WC/C-Coated Racing Gears

2011 ◽  
Vol 488-489 ◽  
pp. 507-510
Author(s):  
Sergio Baragetti ◽  
Stefano Cavalleri ◽  
Federico Tordini
Keyword(s):  
Rolling Contact Fatigue ◽  
Testing Machine ◽  
Contact Fatigue ◽  
Fatigue Behaviour ◽  
Fatigue Tests ◽  
Rolling Contact ◽  
Special Device ◽  
Spur Gears ◽  
Data Set ◽  
Comprehensive Study

In this work a preliminary data set including experimental results from fatigue tests on smooth and foreign object damaged (FOD) aluminium samples coated with WC/C deposited with PVD (physical vapour deposition) technique was considered before testing WC/C-coated spur gears for racing motorcycles under rolling contact fatigue (RCF). The fatigue behaviour of the samples was correlated with the results obtained with the RCF tests on the coated gears. A special device mounted on a universal testing machine was used to carry out the RCF tests.

scholarly journals From Hertzian contact to spur gears: analyses of stresses and rolling contact fatigue

2019 ◽  
Vol 20 (6) ◽  
pp. 626 ◽  
Author(s):  
Guillaume Vouaillat ◽  
Jean-Philippe Noyel ◽  
Fabrice Ville ◽  
Xavier Kleber ◽  
Sylvain Rathery
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Spur Gear ◽  
Point Of View ◽  
Rolling Contact ◽  
Hertzian Contact ◽  
Spur Gears ◽  
Realistic Representation ◽  
Contact Fatigue Life ◽  
Surface Microgeometry

The study of rolling contact fatigue in spur gears requires a good comprehension of all the phenomena occurring at the material scale. On a numerical point of view, a realistic representation of the material and of the load repartition function of the local micro-geometries is needed. However the resulting models are often complex and time-consuming. So, this work aims at developing a model meeting these specificities. Thus, different sections of the spur gear material granular geometry are simulated first. Secondly, the contact pressure fields are computed accurately relatively to the simulated surface microgeometry. Then, the influence of several parameters on their rolling contact fatigue life is highlighted. Among friction, sliding coefficient, load variation and roughness, these individual or combined parameters are taken into account in the model, tested and their impact stressed out. Finally, a fatigue criteria based on rolling contact fatigue micro-cracks nucleation at grain boundaries is proposed in order to compare simulations and influencing parameters to the reference.

A numerical study of the influence of lateral geometry irregularities on mechanical deterioration of freight tracks

2012 ◽  
Vol 226 (6) ◽  
pp. 575-586 ◽  
Author(s):  
Kalle Karttunen ◽  
Elena Kabo ◽  
Anders Ekberg
Keyword(s):  
Numerical Study ◽  
Contact Point ◽  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Field Measurements ◽  
Rolling Contact ◽  
Railway Track ◽  
Operational Conditions ◽  
Track Geometry ◽  
Track Maintenance

Optimisation of railway track maintenance requires knowledge of how a deteriorated track geometry will affect subsequent loading and damage of the track. This is the scope of the current study where, in particular, the influence on track shift forces and rolling contact fatigue is investigated through numerical simulations. To this end, track geometries are obtained from field measurements. Lateral irregularities are extracted and scaled to represent different levels of geometry deterioration. Multibody simulations of dynamic train–track interaction featuring two freight wagon types are performed under different operational conditions. Track shift forces and rolling contact fatigue damage are further evaluated from simulation results. It is found that track shift forces tend to follow a normal distribution for moderate levels of lateral track geometry irregularities, and that an approximate linear relationship between standard deviations of lateral irregularities and track shift forces can be established. The relation between lateral track irregularity magnitude and rolling contact fatigue is more complex. Increasing levels of lateral irregularities will decrease the fraction of curve length affected by rolling contact fatigue for sharp curves, whereas for shallow curves it increases. As detailed in the article, this is caused by the lateral movement of the contact point as imposed by the track irregularities. Furthermore, the influence of wheel/rail friction and wear is investigated.

The rolling contact fatigue of WC/C-coated spur gears

2013 ◽  
Vol 227 (8) ◽  
pp. 850-860 ◽  
Author(s):  
Remigiusz Michalczewski ◽  
Marek Kalbarczyk ◽  
Witold Piekoszewski ◽  
Marian Szczerek ◽  
Waldemar Tuszyński
Keyword(s):  
Rolling Contact Fatigue ◽  
Contact Fatigue ◽  
Rolling Contact ◽  
Spur Gears
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