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Chernets' M.V.,Franko Drohobych State Pedagogical University | Chernets' M.V.,Lublin Polytechnic Institute | Yarema R.Ya.,Lviv Locomotive Repair Plant | Chernets' Yu.O.,Franko Drohobych State Pedagogical University
Materials Science | Year: 2013

We propose a method of integration for the numerical evaluation of the influence of correction and wear of the teeth on the service life of cylindrical gears and contact stresses. The numerical results enable us to establish the qualitative and quantitative regularities of the influence of structural (angular correction of the engagement) and operating (linear wear of the teeth) factors. It is shown that the angular correction enables us to get the optimal displacement coefficients for which the service life is maximum as compared with the uncorrected engagement. It is also established that the actual operating time and load-carrying capacity of the gear are higher in the case where the changes in the initial profiles of the teeth caused by wear are taken into account. © 2013 Springer Science+Business Media New York. Source


Chernets' M.V.,Franko Drohobych State Pedagogic University | Chernets' M.V.,Lublin Polytechnic Institute | Yarema R.Y.,Lviv Locomotive Repair Plant | Chernets' Y.M.,Franko Drohobych State Pedagogic University
Materials Science | Year: 2012

We developed a method for the numerical evaluation of the total influence of correction and wear of the teeth on the service life of cylindrical gears and contact stresses. The results of numerical calculations make it possible to establish the qualitative and quantitative regularities of the influence of both structural (angular correction of the engagement) and operating (linear wear of the teeth) factors. It is shown that the angular correction enables us to get the optimal shifting coefficients for which the service life is maximum as compared with the uncorrected engagement. It is also demonstrated that the actual period of operation and load-carrying capacity of the gear is higher if we take into account the changes in the initial profiles of the teeth as a result of their wear. © 2012 Springer Science+Business Media New York. Source


Chernets' M.V.,Franko Drohobych Pedagogic University | Chernets' M.V.,Lublin University of Technology | Yarema R.Y.,Lviv Locomotive Repair Plant
Materials Science | Year: 2012

A generalized method is developed for the computational evaluation of the wear and service life of cylindrical gears with meshing correction. Gears with angular and height displacement were considered. Using the power gears of a VL-10 locomotive as an example, we established the influence of both kinds of displacement on the gear durability, the wear of wheel teeth for 1 h of operation, the maximal contact pressures, and the sliding velocity. It is shown that, in the case of angular correction, there exist optimal shift coefficients for which the service life is maximal as compared with the case of uncorrected meshing. However, for this gearing, the height correction is inappropriate because it decreases the gear service life. © 2012 Springer Science+Business Media, Inc. Source


Skal's'kyi V.R.,Ukrainian Academy of Sciences | Rudavs'kyi D.V.,Ukrainian Academy of Sciences | Yarema R.Ya.,Lviv Locomotive Repair Plant | Dubyts'kyi O.S.,Lutsk National Technical University
Materials Science | Year: 2013

We propose a method for the evaluation of the residual life of a spring plate of a truck containing a semielliptic crack under the action of cyclic loading and a hydrogen-containing medium. The method is based on the numerical model of fatigue crack propagation. This model is based on the energy criterion of fracture mechanics and takes into account the influence of an external hydrogen-containing medium. We compute the residual lives of hydrogenated and nonhydrogenated materials of the spring plate and compare the results accumulated in these cases. © 2013 Springer Science+Business Media New York. Source

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