Vpliv parametrov vakuumske infuzije na trdnost kompozita

Štiglic, Jan (author), Šturm, Roman (mentor)

V okviru zaključne naloge smo spoznavali proces vakuumske infuzije s ciljem ugotavljanja vplivov procesnih parametrov na kakovost izdelanih plošč. Glavni cilj izvedenega eksperimenta je bil ugotoviti nabor parametrov za zagotavljanje najkrajšega proizvodnega časa ter obenem zagotoviti visoko kakovost plošč. Spreminjali smo presek dovodne cevke, temperaturo procesa ter obliko in orientacijo infuzijske tkanine. Za izdelavo kompozita smo uporabili tkanino iz enosmernih steklenih vlaken ter epoksi smolo. Mehanske lastnosti smo testirali s tri-točkovnim upogibnim preizkusom, pri čemer smo izmerili upogibno trdnost, modul elastičnosti in upogibno razteznost v vzdolžni in prečni smeri. Največji vpliv na hitrost infuzije sta imela delovna temperatura ter usmerjenost in oblika infuzijske mrežice. Ugotovili smo, da je najboljša kombinacija za dosego najkrajšega proizvodnega časa in obenem čim manjše zakasnitve impregnacijskih front delovna temperatura 35 C ter zmanjšanje velikosti infuzijske mrežice na sesalni strani. Z upogibnim preizkusom vzorcev smo ugotovili, da se zaradi zmanjševanja debeline plošč od polnilne do sesalne strani povečuje modul elastičnosti in upogibna trdnost. Sprememba procesnih parametrov v raziskanem območju je imela signifikantni vpliv tudi na prečno trdnost plošč, ni pa imela večjega vpliva na vzdolžno trdnost.

• Language: Slovenian
• Keywords: vakuumske infuzije, procesni parametri, optimizacija, kompoziti, steklena vlakna, epoksi smola, mehanske lastnosti, upogibni preizkusi
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FS - Faculty of Mechanical Engineering
• Place of publishing: Ljubljana
• Publisher: [J. Štiglic]
• Year: 2019
• Number of pages: XVII, 47 f.
• PID: 20.500.12556/RUL-110161
• UDC: 621.9.04:678:620.174(043.2)
• COBISS.SI-ID: 16951323
• Publication date in RUL: 12.09.2019

Secondary language

• Language: English
• Title: The influence of vacuum infusion process parameters on composite stiffness

Abstract

In the final thesis, we researched the process of vacuum infusion with the aim of determining the influence of process parameters on the quality of the manufactured panels. The main objective of the experiment was to determine a set of parameters to ensure the shortest production time, while at the same time ensuring high quality of the plates. We changed the cross section of the delivery tube, the process temperature, and the shape and orientation of the infusion mesh. One-way fiberglass fabric and epoxy resin were used to make the composite. Mechanical properties were tested with a three-point flexural test. We measured the flexural strength, modulus of elasticity, and flexural elongation in the longitudinal and transverse directions. The greatest influences on the speed of the infusion were the process temperature and the shape and size of the infusion mesh. We found that the best combination to achieve the shortest production time while minimizing the delay of the impregnation fronts is preheating the plates at 35°C and reducing the size of the infusion mesh on the suction side. By flexural testing of specimens, we found that because of the reduction in thickness of the plates from the filling to the suction side, the modulus of elasticity and flexural strength are increased. In the area studied, the change in the process parameters also had a significant effect on the transverse strength of the plates but had no significant effect on the longitudinal strength.

• Keywords: vacuum infusion, process parameters, optimization, composites, glass fibre, epoxy resin, mechanical properties, flexural tests