magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Tim Pečnik (Author), Martin Česnik (Mentor), Janko Slavič (Co-mentor)

Abstract

Pri dinamičnih obremenitvah strukture se pojavijo napetosti tako na zunanjih vlaknih kot v notranjosti. Glavni cilj naloge je numerična in eksperimentalna analiza napetostnega stanja v notranjih vlaknih 3D natisnjene PLA strukture ter detekcija loma pri dolgotrajnih ponavljajočih se obremenitvah, tj. utrujanju. V nalogi je izvedeno parametrično modeliranje v programu Ansys z metodo končnih elementov (MKE) in analiza vpliva sprememb parametrov na mehanske lastnosti 3D natisnjenih struktur iz PLA pod dinamičnimi obremenitvami. Uporabili smo celovit pristop, ki povezuje parametrično modeliranje, simulacije, eksperimentalno testiranje ter modalno analizo za določitev lastnih frekvenc in oblik. Eksperimentalno testiranje s hitro kamero na mestih maksimalnih napetosti omogoča detekcijo loma. Rezultati so razkrili ključne točke napetosti in loma v notranjosti strukture.

Keywords

magistrske naloge;3D natisnjene strukture;notranje poškodbe;dinamične obremenitve;numerično modeliranje;utrujanje;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [T. Pečnik]
UDC: 621.9.04:620.178.3:531.22(043.2)
COBISS: 220413955 Link will open in a new window
Views: 69
Downloads: 43
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Other data

Secondary language: English
Secondary title: Vibration-fatigue resilience of interior in 3D-printed structures
Secondary abstract: Under dynamic loads, structures experience stress both on the outer fibers and internally. The main objective of this thesis is the numerical and experimental analysis of the stress state in the internal fibers of 3D printed PLA structures and the detection of fractures under prolonged cyclic loading, also known as fatigue. Parametric modeling was conducted in Ansys using the finite element method (FEM) to analyze the mechanical properties of 3D printed PLA structures under dynamic loads and assess the impact of parametric changes on these properties. A comprehensive approach was used, combining parametric modeling, simulations, experimental testing, and modal analysis to determine natural frequencies and modes. Experimental testing with a high-speed camera at points of maximum stress enabled the detection of fractures. The results revealed key points of stress and fractures within the structure.
Secondary keywords: master thesis;3D printed structures;internal damage;dynamic loads;numerical modeling;fatigue;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XX, 52 str.
ID: 25408316
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