Vpliv ortotropnih mehanskih lastnosti 3D tiskanih struktur na lastno dinamiko sistema

Štih, Sebastjan (author), Česnik, Martin (mentor), Boltežar, Miha (co-mentor)

Uporaba 3D tiskanja postaja priljubljena zaradi hitrega prototipiranja in sposobnosti tiskanja kompleksnih struktur. To omogoča sposobnost tiskanja struktur z različnimi oblikami odlaganja plasti materiala pri različnih gostotah polnila, ki vplivajo na ortotropne mehanske lastnosti in posledično na lastno dinamiko tiskanih struktur, katerih analiza je problem zaključne naloge. Izvedena je bila eksperimentalna analiza izbranih tiskanih struktur, na podlagi katere se je določilo dejanske lastne frekvence preizkušancev. Nato se je preko posodabljanja numeričnega modela določil modul elastičnosti tiskanega materiala. Z znanim modulom elastičnosti materiala je bila opravljena statična numerična analiza in posledično karakterizacija ortotropnih lastnosti tiskanih struktur. S popisanimi lastnostmi je bila izvedena numerična modalna analiza modela preizkušanca, ter na koncu primerjava numeričnih rezultatov modalne analize z rezultati eksperimenta.

• Language: Slovenian
• Keywords: 3D tiskanje, trdnost, modalna analiza, lastne frekvence, numerična analiza, eksperimentalna analiza
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [S. Štih]
• Year: 2021
• Number of pages: XIII, 41 str.
• PID: 20.500.12556/RUL-129534
• UDC: 004.925.84:539.3:519.6(043.2)
• COBISS.SI-ID: 81431811
• Publication date in RUL: 04.09.2021

Secondary language

• Language: English
• Title: Influence of orthotropic mechanical properties of 3D printed structures on system's free vibration

Abstract

The use of 3D printing is becoming popular due to rapid prototyping and the ability to print complex structures. This enables the ability to print structures with different infill patterns at different infill densities, which affect orthotropic mechanical properties and consequently the intrinsic dynamics of printed structures, the analysis of which is the problem of the final thesis. An experimental analysis of selected printed structures was performed, on the basis of which the actual natural frequencies of the subjects were determined. The modulus of elasticity of the printed material was then determined by updating the numerical model. With the known modulus of elasticity of the material, a static numerical analysis was conducted and consequently the characterization of the orthotropic properties of printed structures was performed. A numerical modal analysis of the models subject was performed with the described properties, and finally a comparison of the numerical results of the modal analysis with the experimental results.

• Keywords: 3D printing, mechanics of materials, modal analysis, natural frequencies, numerical analysis, experimental analysis