Primerjava strižne trdnosti kompozita iz ogljikovih vlaken v primeru izdelave z ročno laminacijo in izdelave v autoclavu

Atelšek, Kristjan (author), Šturm, Roman (mentor), Bergant, Zoran (comentor)

V okviru diplomskega dela smo zajeli vso literaturo na podlagi kompozitov njihovih lastnosti ter postopki izdelave, podrobneje smo se spoznali z dvema tehnološkima postopkoma izdelave kompozitnih materialov, s ciljem ugotavljanja vpliva tehnologije izdelave na strižno trdnost. Testiranje strižne trdnosti je potekalo na izrezanih vzorcih iz dveh plošč, izdelanih iz ogljikove tkanine ter epoksidne smole, z enakimi ploskovnimi dimenzijami, enako postavitvijo vlaken, enakimi materiali ter z dvema različnima postopkoma izdelave. Vzorce smo testirali na strižno trdnost s pomočjo tri-točkovnega strižnega preizkusa po standardu ASTM D 2344. Pri tem smo ugotovili, da so vzorci izdelani po vakuumski infuziji in dodatnim stiskanjem v autoclavu zdržali večjo strižno trdnost v primerjavi z mokro ročno laminacijo. Z mikroskopiranjem smo nato analizirali površinsko poroznost in mikrostrukturo vzorcev, kjer smo ugotovili, da kompozit, izdelan z vakuumsko infuzijo, zdrži večjo strižno trdnost predvsem zaradi manjše poroznosti in manj napak, katere vnesemo s postopkom mokre ročne laminacije.

• Language: Slovenian
• Keywords: ročna laminacija, autoclav, strižna trdnost, kompoziti, ogljikova vlakna, epoksi smola, mehanske lastnosti, mikroskopiranje, tri-točkovni preizkus striga
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [K. Atelšek]
• Year: 2020
• Number of pages: XX, 49 str.
• PID: 20.500.12556/RUL-121458
• UDC: 539.415:62-419:678.686(043.2)
• COBISS.SI-ID: 33273347
• Publication date in RUL: 10.10.2020

ATELŠEK, Kristjan, 2020, Primerjava strižne trdnosti kompozita iz ogljikovih vlaken v primeru izdelave z ročno laminacijo in izdelave v autoclavu [online]. Bachelor’s thesis. Ljubljana : K. Atelšek. [Accessed 28 March 2025]. Retrieved from: https://repozitorij.uni-lj.si/IzpisGradiva.php?lang=eng&id=121458

Secondary language

• Language: English
• Title: Comparison of the shear strength of a carbon fiber composite in the case of fabrication with hand lay-up and fabrication in autoclave

Abstract

As part of the final work, we covered the literature based on composites their properties and manufacturing procedures, we got acquainted in detail with two technological procedures fort the production of composite materials with aim of determining the impact of manufacturing technology on shear strength. Shear strength testing was performed on cut-out samples from two plates, made of carbon fabric and epoxy resin, with the same surface dimensions, the same fiber placement, the same materials, and with two different manufacturing processes. The samples were tested for shear strength, using a tree-point shear test, according to standard ASTM D 2344. We found out that the samples, made with vacuum infusion with additional compression in an autoclave withstand higher shear strength, compared to wet/hand lay-up. The surface porosity and microstructure of the samples were then analysed with microscope, where it was found that the composite made by vacuum infusion withstands higher shear strength because of minor porosity and less flaws, which are entered by process of wet/hand lay-up lamination.

• Keywords: hand lay-up, autoclave, shear strength, composites, carbon fiber, epoxy resin, mechanical properties, microscopy, three-point shear test