magistrsko delo magistrskega študijskega programa II. stopnje Strojništvo
Urška Čavič (Author), Zoran Bergant (Mentor), Roman Šturm (Co-mentor)

Abstract

Preučili smo vpliv dveh izbranih tehnologij izdelave biokompozitnih bazaltnih materialov, in sicer ročne laminacije in vakuumske infuzije z utrjevanjem v avtoklavu. Za popis osnovnih materialnih lastnosti smo najprej izdelali natezni preizkus bazaltnih kompozitov križno postavljenih tkanin. V nadaljevanju smo izdelali preizkuse z Arcan vpenjalnimi čeljustmi, s čimer smo pridobili podatke o porušnih trdnostih pri kotih med 0° in 90° s 15° inkrementom. S pomočjo mikroskopa smo analizirali načine preloma pri čistem nategu, v kombinacijah nateg-strig in čistem strigu. Pri večosnih obremenitvah med 15° in 75° ter pri čistem strigu pri 90° smo opazili znatno kopičenje deformacij in poškodb zaradi strižnih napetosti. Z mikroskopsko analizo smo ugotovili, da je velik obseg poškodb posledica strižne deformacije po rotaciji vlaken, pritrjenih pri 0°, medtem ko so vlakna pri 90° ohranila svojo prvotno ravno obliko. Rezultati preizkusov so pokazali, da so kompoziti, izdelani z vakuumsko infuzijo in utrjevanjem v avtoklavu, dosegli višji volumski delež vlaken, modul elastičnosti in natezno trdnost v smeri prečno na vlakna, medtem ko so kompoziti, izdelani z ročno laminacijo, dosegli višjo natezno trdnost v smeri prečno na vlakna in strižno trdnost v smereh prečno in vzdolžno z vlakni.

Keywords

magistrske naloge;bazaltni kompoziti;biokompoziti;ročna laminacija;vakuumska infuzija;arcan preizkus;natezna trdnost;

Data

Language: Slovenian
Year of publishing:
Typology: 2.09 - Master's Thesis
Organization: UL FS - Faculty of Mechanical Engineering
Publisher: [U. Čavič]
UDC: 678.061:539.424(043.2)
COBISS: 219498499 Link will open in a new window
Views: 129
Downloads: 27
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Other data

Secondary language: English
Secondary title: Mechanical properties of basalt bio-composites made by hand lay-up and vacuum infusion
Secondary abstract: The influence of two selected composite manufacturing technologies, hand lay-up lamination and vacuum infusion with autoclave curing, was investigated. To characterise the basic material properties, tensile testing of cross-ply basalt laminates was first carried out. Next, Arcan fixture tests were performed to obtain data on the failure strenghts at angles between 0° and 90° with a 15° increment. The fracture modes in pure tension, combined tension-shear and pure shear were analysed using a microscope. In biaxial states between 15°-75° and pure shear at 90°, the deformation and the shear-induced damage start to accumulate significantly. Microscopic analysis showed that large extent of damage is the consequence of the shear deformation after the rotation of 0° clamped fibers, while the 90° fiber maintained their original straight form. The test results showed that the composites produced by vacuum infusion and autoclave curing achieved better fiber volume fraction, elastic modulus and tensile strenght in transverse direction, while composites made by han lay-up achieved higher tensile strenght in transverse direction and shear strenght in both longitudinal and transverse direction.
Secondary keywords: master thesis;basalt composites;biocomposites;hand lay-up;vacuum infusion;arcan test;tensile strenght;
Type (COBISS): Master's thesis/paper
Study programme: 0
Thesis comment: Univ. Ljubljana, Fak. za strojništvo
Pages: XX, 71 str.
ID: 25386142