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Calculation model for pre-stressed bolted joints of slewing bearings
Péter Göncz, Srečko Glodež, 2009, original scientific article

Abstract: The presented paper describes a calculation model for pre-stressed bolted joints used to connect slewing bearings to the adjacent structures. A classical pre-stressed bolted joint calculation model is described and its insufficiencies for direct application on slewing bearings are pointed out. Finally, the suggested stress analysis is done by modelling the most loaded single bolt segment of the slewing bearing assembly, applying the preload and the working load on it. The stress determination in the bolt is done by finite element analysis.
Keywords: preiskava materialov, vijačne zveze, aksialni ležaji, dimenzioniranje, matematični modeli, materials testing, bolted joints, slewing bearings, dimensioning, calculation models
Published in DKUM: 10.07.2015; Views: 2217; Downloads: 101
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Fatigue behaviour of 42CrMo4 steel under contact loading
Péter Göncz, Rok Potočnik, Srečko Glodež, 2010, original scientific article

Abstract: The presented paper describes the experimental determination of fatigue crack growth parameters for high strength low-alloy steel 42CrMo4. The experiments were performed according to the ASTM E647 standard and the parameters of the Paris equation (C and m) were determined. Test specimens were subjected to impulsive cyclic tensile loading on a testing machine. During that the fatigue crack propagation was monitored as a function of elapsed fatigue cycles. Taking these experimental results into account the fatigue crack growth rates at different stress-intensity factor ranges was determined. To consider the variable material properties of the slewing bearing ring trough depth, specimens of different hardnesses were tested. Beside the experimental result a 2D contact fatigue crack propagation model is also presented. This model can be used for the simulation of surface initiated contact fatigue crack propagation on the roller slewing bearing's raceway. As a computational example the results of a finite element method contact fatigue crack propagation simulation are presented.
Keywords: crack propagation, slewing bearings, numerical modelling, experiments
Published in DKUM: 07.06.2012; Views: 2090; Downloads: 97
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