Advances in engineering solutions in recent few decades caused that conventional fatigue limit (for steels and cast irons given for number of 10⁷ cycles) is no more sufficient. Construction parts of newly introduced transport vehicles, operating at high velocities and at long distances, reach during their lifetime very high numbers of loading cycles, in order of 10⁹. For this reason, values of fatigue limits for 10⁹ cycles must be considered in design and construction of transport vehicles. In this study, authors present how dramatically will change the design of shaft, when fatigue limit for 10⁹ cycles is considered.

This paper presents the research of modal characteristics of the bolted housing. The aim of the research was to find out the impact of the methodology of the solution of bolted joints on modal characteristics of the bolted housing of the...

The article deals with the proposed algorithm for calculating the frictional power loss generated by the influence of sliding in bodies during their rotation under contact stress. PTC/Creo Parametric CAD system was used for creation of parametric 3D virtual model of rolling bearings due to FEM analysis. For FEM analysis, the static structural analysis for rolling bearing model was defined in Ansys/Workbench CAE software. Dimensions of bearing are: pitch diameter: dpw = 548 mm, roller diameter: dwe = 41.7 mm, roller length: lwe = 61.2 mm, nominal contact angle: α0 = 28°, revolution of inner ring: ni = 25 rpm, radial load: Qmax = 255 kN. For all rolling bearing components a linear isotropic elasticity material model with Young’s modulus E = 210 GPa and Poisson’s ratio µ = 0.3 for bearing steels were use. The results will be presented on the example of a rolling bearing with spherical and taper shapes of rolling elements.