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Mechanical behaviour of photopolymer cell-size graded triply periodic minimal surface structures at different deformation rates
Yunus Emre Yilmaz, Nejc Novak, Oraib Al-Ketan, Hacer Irem Erten, Ulas Yaman, Anja Mauko, Matej Borovinšek, Miran Ulbin, Matej Vesenjak, Zoran Ren, 2024, izvirni znanstveni članek

Opis: This study investigates how varying cell size affects the mechanical behaviour of photopolymer Triply Periodic Minimal Surfaces (TPMS) under different deformation rates. Diamond, Gyroid, and Primitive TPMS structures with spatially graded cell sizes were tested. Quasi-static experiments measured boundary forces, representing material behaviour, inertia, and deformation mechanisms. Separate studies explored the base material’s behaviour and its response to strain rate, revealing a strength increase with rising strain rate. Ten compression tests identified a critical strain rate of 0.7 s−1 for “Grey Pro” material, indicating a shift in failure susceptibility. X-ray tomography, camera recording, and image correlation techniques observed cell connectivity and non-uniform deformation in TPMS structures. Regions exceeding the critical rate fractured earlier. In Primitive structures, stiffness differences caused collapse after densification of smaller cells at lower rates. The study found increasing collapse initiation stress, plateau stress, densification strain, and specific energy absorption with higher deformation rates below the critical rate for all TPMS structures. However, cell-size graded Primitive structures showed a significant reduction in plateau and specific energy absorption at a 500 mm/min rate.
Ključne besede: cellular materials, triply periodical minimal surface, photopolymer, mechanical properties, strain rate, experimental compressive testing, computer simulations
Objavljeno v DKUM: 22.05.2024; Ogledov: 163; Prenosov: 7
.pdf Celotno besedilo (9,33 MB)
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A computational model for analysing the dry rolling/sliding wear behaviour of polymer gears made of POM
Aljaž Ignatijev, Matej Borovinšek, Srečko Glodež, 2024, izvirni znanstveni članek

Opis: 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.
Ključne besede: polymer gears, rolling/sliding contact, wear, computational modelling
Objavljeno v DKUM: 12.04.2024; Ogledov: 147; Prenosov: 10
.pdf Celotno besedilo (3,67 MB)
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Obnašanje giroidnih materialov z dodanimi avksetičnimi vzorci : diplomsko delo
Blaž Vičman, 2024, diplomsko delo

Opis: Cilj diplomske naloge je bil preučiti vpliv spreminjanja parametrov avksetičnih vzorcev na vrednost Poissonovega razmerja giroidnih materialov pod obremenitvijo. S pomočjo geometrijskih modelov ter računalniških simulacij smo pokazali, da avksetični vzorci vplivajo na Poissonovo razmerje giroidnih materialov. Vpliv je odvisen od materialnih lastnosti avksetičnih vzorcev, razmerja med velikostjo avksetične in giroidne celice ter od položaja avksetičnega vzorca na modelu. Ugotovili smo tudi, da je za vpliv na Poissonovo razmerje dovolj uporabiti samo del avksetičnega vzorca.
Ključne besede: giroidni materiali, avksetične strukture, Poissonovo razmerje, metoda končnih elementov
Objavljeno v DKUM: 04.04.2024; Ogledov: 208; Prenosov: 40
.pdf Celotno besedilo (5,68 MB)

Introduction to the Computer Simulations : Script
Nejc Novak, Matej Borovinšek, Matej Vesenjak, Zoran Ren, 2024

Opis: 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.
Ključne besede: computational simulations, solid mechanics, Finite Element Method, designing, numerical methods
Objavljeno v DKUM: 12.03.2024; Ogledov: 331; Prenosov: 22
.pdf Celotno besedilo (7,73 MB)
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Rekonstrukcija stranskih vodilnih koles na stroju za pripravo aluminijastih kolobarjev : diplomsko delo
Timotej Rebernak Pliberšek, 2023, diplomsko delo

Opis: 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.
Ključne besede: rekonstrukcija, podjetje Impol d.o.o, numerične simulacije, metoda končnih elementov, SolidWorks, PrePoMax
Objavljeno v DKUM: 05.03.2024; Ogledov: 354; Prenosov: 48
.pdf Celotno besedilo (3,82 MB)

HPC innovation for European SMES : H2020-JTI-EuroHPC-2019-2
Janez Langus, Jure Pocrnjič, Janez Langus, Zoran Ren, Miran Ulbin, Matej Borovinšek, Nejc Novak, Anja Mauko, končno poročilo o rezultatih raziskav

Objavljeno v DKUM: 12.02.2024; Ogledov: 247; Prenosov: 6
.pdf Celotno besedilo (935,94 KB)

High strain-rate deformation analysis of open-cell aluminium foam
Anja Mauko, Mustafa Sarıkaya, Mustafa Güden, Isabel Duarte, Matej Borovinšek, Matej Vesenjak, Zoran Ren, 2023, izvirni znanstveni članek

Opis: This study investigated the high-strain rate mechanical properties of open-cell aluminium foam M-pore®. While previous research has examined the response of this type of foam under quasi-static and transitional dynamic loading conditions, there is a lack of knowledge about its behaviour under higher strain rates (transitional and shock loading regimes). To address this gap in understanding, cylindrical open-cell foam specimens were tested using a modified Direct Impact Hopkinson Bar (DIHB) apparatus over a wide range of strain rates, up to 93 m/s. The results showed a strong dependency of the foam's behaviour on the loading rate, with increased plateau stress and changes in deformation front formation and propagation at higher strain rates. The internal structure of the specimens was examined using X-ray micro-computed tomography (mCT). The mCT images were used to build simplified 3D numerical models of analysed aluminium foam specimens that were used in computational simulations of their behaviour under all experimentally tested loading regimes using LS-DYNA software. The overall agreement between the experimental and computational results was good enough to validate the built numerical models capable of correctly simulating the mechanical response of analysed aluminium foam at different loading rates.
Ključne besede: Open-cell aluminium foam, Micro-computed tomography, High-strain rate, Direct impact hopkinson bar, Digital image correlation, Computer simulation
Objavljeno v DKUM: 06.12.2023; Ogledov: 379; Prenosov: 28
.pdf Celotno besedilo (3,28 MB)
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Structural topology optimization of the wheel's spokes of NASA's perseverance rover using advanced discretization techniques : magistrsko delo
Jure Trdin, 2023, magistrsko delo

Opis: In the space industry, the continuous effort to reduce the weight of structural components is of utmost importance due to the high cost of launching mass into space. Structural analyses and optimizations with numerical methods play a crucial role in achieving this goal by minimizing material usage while ensuring structural integrity. The objective of this dissertation is to implement and demonstrate the accuracy and effectiveness of meshless methods in numerical studies compared to the Finite Element Method (FEM), focusing on designing cost-effective and lightweight components. Through benchmark examples and extensive research on optimal parameters, the accuracy and effectiveness of these methods are established. Furthermore, practical application is demonstrated by optimizing the spoke of NASA's Rover Perseverance wheel, resulting in more optimized structures with significantly reduced mass and lower mechanical stresses. Additionally, analysis of different materials for the wheel's spoke is performed with the aim of further reducing mass and increasing performance. By utilizing structural optimization, this work not only highlights the diverse applications and benefits of integrating structural optimization in the product design phase but also contributes to the ongoing efforts in the space industry to reduce material mass and enhance performance, addressing the challenges associated with launching mass into space while ensuring the adequate structural resistance. Furthermore, this thesis also contributes to the development of the meshless methods in structural optimization, showcasing its effectiveness and potentials.
Ključne besede: Space technology, Mars Rover, Structural Optimization, Meshless Methods
Objavljeno v DKUM: 08.11.2023; Ogledov: 343; Prenosov: 25
.pdf Celotno besedilo (41,26 MB)

Parametrično modeliranje enostopenjskega zobniškega reduktorja z upoštevanjem koeficientov profilnih premikov : diplomsko delo
Jernej Kralj, 2021, diplomsko delo

Opis: Diplomsko delo obsega opis parametričnega modeliranja enostopenjskega zobniškega reduktorja s poudarkom na modeliranju valjastih zobnikov s poševnim ozobjem, upoštevajoč vpliv vsote koeficientov profilnih premikov na geometrijo ozobja. Rezultat diplomske naloge je torej parametričen 3D model zobniškega gonila, katerega geometrija se ustrezno spreminja v odvisnosti od vrednosti parametrov. Poleg tega so dodane še nekatere nadgradnje, kot so izračun življenjske dobe raznih strojnih elementov ter izračun površinskih tlakov ipd.
Ključne besede: parametrično modeliranje, zobniki s poševnim ozobjem, koeficienti profilnih premikov, strojni elementi, 3D model
Objavljeno v DKUM: 11.10.2023; Ogledov: 568; Prenosov: 73
.pdf Celotno besedilo (4,29 MB)

Rekonstrukcija sklopnih elementov pretočnega rezalnika OptiMUM : diplomsko delo
Jan Gerčer, 2023, diplomsko delo

Opis: V diplomskem delu je predstavljena rekonstrukcija sklopnih elementov na pretočnem rezalniku, ki je priključek za procesiranje hrane na kuhinjskem aparatu OptiMUM. Namen rekonstrukcije je pohitritev in pocenitev proizvodnega procesa izdelka z izbiro alternativnega materiala in z znižanjem kompleksnosti izdelka. Na začetku je predstavljen problem, postavljeni so cilji in zapisane zahteve. Temu sledi izbira alternativnega materiala in rekonstrukcija obstoječe geometrije z novimi variantami v obliki 3D-modelov, ki so podprte z rezultati numeričnih simulacij. Delo zajema tudi praktično testiranje fizičnih kosov ter diskusijo pridobljenih rezultatov. Rezultat diplomskega dela je nova varianta sklopnih elementov priključka iz cenejšega materiala in z nižjo kompleksnostjo.
Ključne besede: rekonstrukcija, sklopni elementi, pretočni rezalnik, OptiMUM, pocenitev
Objavljeno v DKUM: 09.10.2023; Ogledov: 275; Prenosov: 17
.pdf Celotno besedilo (3,40 MB)

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