Merjenje efektivnih mehanskih lastnosti slojevitih kompozitov prek tritočkovnega upogiba

Janev, Blaž (author), Brojan, Miha (mentor)

V zadnjem času kompozitni materiali dobivajo velik pomen, saj so postali nepogrešljivi v vesoljski, letalski in vojaški tehniki. Močno pa so se tudi že uveljavili v avtomobilski industriji ter pri izdelavi športnih rekvizitov. Zaradi vse večjega nadomeščanja klasičnih konstrukcijskih materialov s kompozitnimi ter nehomogenosti le teh se pojavljajo izzivi na področju določanja materialnih lastnosti. V zaključni nalogi je prikazan proces določanja efektivnega modula elastičnosti slojevite kompozitne sendvič strukture. V nalogi obravnavamo napetostno in deformacijsko stanje v prerezu kompozitnega nosilca. Izdelani so bili vzorci slojevite kompozitne sendvič strukture, na katerih smo izvedli 3-točkovni upogibni test. Opravljena je bila primerjalna analiza med rezultati analitičnega preračuna, ki smo ga naredili s pomočjo znanih mehanskih lastnosti posameznih komponent kompozita ter rezultati eksperimentalnega testa. Zaradi dobre primerljivosti rezultatov lahko trdimo, da je možno iz znanih mehanskih lastnosti komponent teoretično zelo dobro napovedati efektivni modul elastičnosti kompozitov.

• Language: Slovenian
• Keywords: 3-točkovni upogibni test, ogljikova vlakna, kompoziti, sendvič strukture, analiza, Formula Student
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [B. Janev]
• Year: 2021
• Number of pages: XIV, 50 str.
• PID: 20.500.12556/RUL-128023
• UDC: 620.174-037.52(043.2)
• COBISS.SI-ID: 72862211
• Publication date in RUL: 01.07.2021

JANEV, Blaž, 2021, Merjenje efektivnih mehanskih lastnosti slojevitih kompozitov prek tritočkovnega upogiba [online]. Bachelor’s thesis. Ljubljana : B. Janev. [Accessed 11 April 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=128023

Secondary language

• Language: English
• Title: Measuring effective mechanical properties of layered composites via three-point bending

Abstract

Composite materials are gaining more and more importance, as they have become indispensable in aerospace and military applications. But they have also become strongly established in the automotive industry and in the manufacture of sports equipment. Due to the increasing replacement of classical construction materials by composite materials and their inhomogeneity, challenges arise in the field of determining material properties. In this thesis the method for determining the effective modulus of elasticity of a layered composite sandwich structure is presented. The stress and strain state in the cross section of a composite beam is considered. Samples of a layered composite sandwich structure were fabricated and a 3-point bending test was performed on them. A comparative analysis was performed between the results of the analytical calculation, carried out with the known mechanical properties of each component of the composite, and the results of the experimental test. Due to the good comparability of the results, it can be argued that it is theoretically possible to predict the effective modulus of elasticity of composite materials very well from the known mechanical properties of the components.

• Keywords: 3-point bend test, carbon fibres, composites, sandwich structure, analysis, Formula Student