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Abstract: In the presented study, a computational model was developed to analyse the wear behaviour of contacting mechanical elements like gears, bearings, etc. The model was built in the framework of the PrePoMax open-source CalculiX FEM (Finite Element Method) solver and enables a detailed analysis of the meshing dynamics of contacting mechanical elements. The model also considers the hyperelastic behaviour of the material in contact and the impact of operating temperature. The developed computational model was evaluated on a spur gear pair, where the pinion made of POM (Polyoxymethylene) was meshed with a support gear made of case-hardened steel 16MnCr5. The computational results were compared with the analytical results according to the VDI 2736 guidelines and experimental results on the real gear pairs. Compared to the standardised procedure according to the VDI 2736 guidelines, the model's main advantage is the geometry updating after a chosen number of loading cycles, enabling a more accurate prediction of wear behaviour under rolling/sliding loading conditions.
Keywords: wear, polymer gears, computational modelling, experimental testing
Published in DKUM: 08.04.2025; Views: 0; Downloads: 9
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Abstract: A computational model for analysing the tooth deflection of polymer gears is presented in this paper. Because polymer gears have less stiffness compared to metal gears, the proposed approach considers a comprehensive analysis to determine the most suitable numerical model, i.e., the number of teeth that should be modelled for a given gear’s geometry and material. The developed computational model has been evaluated using a spur gear pair, where the pinion made of POM was meshed with a support gear made of steel. Material properties were assigned with linear elastic characteristics for the gear, while the pinion was characterised by hyperelastic properties using POM material. Furthermore, a nonlubricated frictional contact between the gear and pinion was considered in the numerical computations. The computational results that were obtained were compared to the empirical results according to VDI 2736 guidelines. Here, the computational approach showed more accurate results due to the hyperelastic material characteristics of POM and the simulation of multiple teeth meshing. However, VDI 2736 calculation showed comparability with the computational results, with a slightly larger deviation at higher loads. In this respect, the proposed computational approach is more suitable for analysing the tooth deflection of polymer gears under higher loads.
Keywords: polymer gears, tooth deflection, computational modelling
Published in DKUM: 19.03.2024; Views: 266; Downloads: 29
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Abstract: Diplomsko delo obravnava optimizacijo topologije zavornih čeljusti. Najprej je prikazan analitični preračun obremenitev zavornih čeljusti. Nato sem naredil volumski model in mu dodal različne robne pogoje, materialne lastnosti in ga zamrežil s končnimi elementi. Narejena je optimizacija topologije v programu ProTOp, s tehnološkimi pogoji in brez njih, ter primerjava rezultatov. Z MKE analizo je prikazan vpliv temperaturnega raztezanja materiala in opis možnih posledic. Na koncu je opisana priprava modela za nadaljnjo uporabo. Dobljeni rezultati dokazujejo, da z zmanjšanjem teže zavorne čeljusti še zmeraj opravljajo svojo funkcijo.
Keywords: Optimizacija topologije, MKE, SolidWorks, Abaqus, ProTOp
Published in DKUM: 02.07.2019; Views: 1535; Downloads: 216
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