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1.
Konstruiranje in izdelava zobniške dvojice reduktorja vrtilnika tunelov
Blaž Zatler, 2023, undergraduate thesis

Abstract: V diplomskem delu sem se posvetil preračunu in izdelavi zobnika oz. pastorka, ki je del gonila za pogon stroja za izkop zemljine v tunelih. V diplomskem delu so najprej predstavljene teoretične osnove preračuna zobniške dvojice. Sledi jim analiza zasnove reduktorja in preračun osnovnih geometrijskih veličin. S pomočjo pridobljenih podatkov sem nato izvedel trdnostni preračun, s katerim sem preveril ustreznost zasnove in določil potrebne manjkajoče podatke za izdelavo pastorka. Na koncu sem v skladu s preračunom pripravil tehnično dokumentacijo pastorka in predstavil izdelovalne postopke, s katerimi je pastorek izdelan.
Keywords: gonilo, zobnik, konstruiranje, preračun zobnikov, izdelava zobnikov
Published in DKUM: 09.07.2024; Views: 57; Downloads: 0

2.
A computational model for analysing the dry rolling/sliding wear behaviour of polymer gears made of POM
Aljaž Ignatijev, Matej Borovinšek, Srečko Glodež, 2024, original scientific article

Abstract: This study presents a computational model to determine the wear behaviour of polymer gears. Using PrePoMax finite element numerical calculation software, a proposed computational model was built to predict dry rolling/sliding wear behaviour based on Archard’s wear model. This allows the calculation of the wear depth in each loading cycle with constant mesh updating using the finite element method. The developed computational model has been evaluated on a spur gear pair, where the pinion made of POM was meshed with a support gear made of steel. The computational results obtained were compared with the analytical results according to the VDI 2736 guidelines. Based on this comparison, it was concluded that the proposed computational model could be used to simulate the wear behaviour of contacting mechanical elements like gears, bearings, etc. The main advantage of the model, if compared to the standardised procedure according to the VDI 2736 guidelines, is the geometry updating after a chosen number of loading cycles, which enables a more accurate prediction of wear behaviour under rolling/sliding loading conditions.
Keywords: polymer gears, rolling/sliding contact, wear, computational modelling
Published in DKUM: 12.04.2024; Views: 141; Downloads: 10
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3.
Noise evaluation of coated polymer gears
Brigita Polanec, Srečko Glodež, Aleš Belšak, 2023, original scientific article

Keywords: polymer gears, PVD-coatings, experimental testing, noise evaluation
Published in DKUM: 10.04.2024; Views: 148; Downloads: 7
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4.
High-cycle fatigue behaviour of the aluminium alloy 5083-H111
Branko Nečemer, Franc Zupanič, Tomaž Vuherer, Srečko Glodež, 2023, original scientific article

Keywords: aluminium alloys, rolling direction, high-cycle fatigue, fracture analysis
Published in DKUM: 04.04.2024; Views: 144; Downloads: 13
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5.
Microstructure, mechanical properties and fatigue behaviour of a new high-strength aluminium alloy AA 6086
Franc Zupanič, Jernej Klemenc, Matej Steinacher, Srečko Glodež, 2023, original scientific article

Abstract: This study presents the comprehensive experimental investigation of the microstructure, mechanical and fatigue properties of a new high-strength aluminium alloy AA 6086, which was developed from a commercial aluminium alloy AA 6082. The new alloy possesses a higher content of Si, and, it also contains Cu and Zr. The alloy was characterised in the as-cast condition after homogenisation, extrusion, and T6 heat treatment. Light microscopy, scanning and transmission electron microscopy with energy dispersive spectrometry were used to analyse the microstructure and the fractography of broken specimens. The quasi-static and fatigue tests were performed on the MTS Landmark 100 kN servo-hydraulic test machine, controlled with a mechanical extensometer with a 25 mm gauge length. The quasi-static strength of the analysed aluminium alloy AA 6086 was found to be significantly higher if compared to some other AA 6xxx alloys, while the ductility was kept almost the same. The experimental results of the comprehensive fatigue tests in a Low Cycle Fatigue (LCF) and High Cycle Fatigue (HCF) regime showed a good fatigue resistance, and represent a good basis for engineering design applications of the newly developed aluminium alloy AA 6086.
Keywords: aluminijeve zlitine, karakterizacija materiala, utrujanje, eksperimentalno testiranje, statistično ovrednotenje, Aluminium Alloy AA 6086, material characterisation, fatigue behaviour, experimental testing, statistical evaluation
Published in DKUM: 02.04.2024; Views: 201; Downloads: 12
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6.
LCF behaviour of high strength aluminium alloys AA 6110A and AA 6086
Jernej Klemenc, Srečko Glodež, Matej Steinacher, Franc Zupanič, 2023, original scientific article

Abstract: The proposed research presents the comprehensive investigation of the Low Cycle Fatigue (LCF) behaviour of two high-strength aluminium alloys of series AA 6xxx: the conventional alloy AA 6110A and the newly developed alloy AA 6086. Both alloys were characterised in the as-cast condition after homogenisation, extrusion, and T6 heat treatment. The quasi-static strength and hardness of the aluminium alloy AA 6086 were found to be significantly higher if compared to the AA 6110A alloys, while the ductility was a little bit smaller. The LCF tests showed that the AA 6086 alloy is more suitable for the high-cycle fatigue regime. On the other hand, the engineering advantage of the AA 6110A alloy is only for low-cycle fatigue applications if less than 100 loading cycles are expected in the service life of the analysed structure. The fatigue cracks formed predominantly on the α-AlMnSi intermetallic particles in both alloys, and, during LCF tests, exhibited small crack propagation. The area of the fatigue crack growth was much smaller than the area of the forced fracture. At smaller amplitude strains the fatigue striations were present at the fracture surface, while, at higher amplitude strains, they were not present. The obtained experimental results represent a good basis for engineering design applications of the analysed alloys AA 6086 and AA 6110A.
Keywords: aluminijeve zlitine, malociklično utrujanje, eksperimentalno testiranje, fraktografija, aluminium alloys, low cycle fatigue, experimental testing, fractography
Published in DKUM: 29.03.2024; Views: 139; Downloads: 12
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7.
Computational model for analysing the tooth deflection of polymer gears
Aljaž Ignatijev, Srečko Glodež, Janez Kramberger, 2024, original scientific article

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: 220; Downloads: 9
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8.
Konstruiranje nosilca cevi za polnilni zrak motorja TCD 16.0 V8 : magistrsko delo
Miha Kosi, 2024, master's thesis

Abstract: V magistrskem delu je obravnavano konstruiranje nosilca cevi za polnilni zrak motorja TCD 16.0 V8. Pri testiranju delovanja motorja so se na stari varianti nosilca pojavile velike vibracije, zato je bilo potrebno konstruirati nov nosilec z ugodnejšimi vibracijskimi in trdnostnimi lastnostmi. V začetku so predstavljene teoretične osnove sekundarnih komponent obravnavanega motorja, modalna analize ter vibracijski testi nosilcev, ki so bili izvedeni na delujočem motorju. V nadaljevanju sta podrobneje opisani obe varianti nosilcev ter njune geometrijske in materialne lastnosti. Za validacijo novega koncepta je nato opisana priprava numeričnega modela, naloga pa se nadaljuje s samo simulacijo. Najprej je bila izvedena modalna analiza, pri kateri so podrobneje opisane prve tri lastne frekvence. Sledi numerična trdnostna analiza, v kateri so predstavljeni rezultati največjih pomikov in napetosti. Rezultati so bili opisani in analizirani in tako smo potrdili, da ima nov koncept ustreznejše karakteristike.
Keywords: konstruiranje, motorji z notranjim izgorevanjem, sekundarne komponente, modalna analiza, trdnostna analiza
Published in DKUM: 12.03.2024; Views: 229; Downloads: 0
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9.
Introduction to the Computer Simulations : Script
Nejc Novak, Matej Borovinšek, Matej Vesenjak, Zoran Ren, 2024

Abstract: The script entitled „Introduction to the computer simulations“ in the field of Engineering Computer Simulations is intended as a study aid in the lectures of the courses Engineering Computer Simulations for foreign students at the University of Maribor and for students at Kumamoto University, Japan. It explains all the material that students must master in these subjects, and is consistent with the subject curriculum. The basics of computational simulations, based on the Finite Element Method, are given from the theoretical basics to step-by-step preparation of simple computational models and their analysis in PrePoMax software.
Keywords: computational simulations, solid mechanics, Finite Element Method, designing, numerical methods
Published in DKUM: 12.03.2024; Views: 313; Downloads: 22
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10.
Rekonstrukcija stranskih vodilnih koles na stroju za pripravo aluminijastih kolobarjev : diplomsko delo
Timotej Rebernak Pliberšek, 2023, undergraduate thesis

Abstract: V diplomskem delu smo s pomočjo računalniških simulacij analizirali os vodilnih koles cepilno pripravljalnega stroja alumijastih kolobarjev, kjer so se pojavljale razpoke na oseh. S pomočjo rezultatov numerične analize obstoječe osi smo ugotovili vzrok za nastajanje razpok, ter predlagali boljšo konstrukcijsko rešitev osi na podlagi rezultatov. Numerične simulacije smo izvajali s pomočjo programskega paketa PrePoMax, ki temelji na metodi končnih elementov.
Keywords: rekonstrukcija, podjetje Impol d.o.o, numerične simulacije, metoda končnih elementov, SolidWorks, PrePoMax
Published in DKUM: 05.03.2024; Views: 352; Downloads: 48
.pdf Full text (3,82 MB)

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