Rastezna i goriva svojstva hibridnih kompozita s polimernom matricom

undergraduate thesis

• Title (english): Tensile and burning properties of hybrid polymer based composites
• Author: Iva Grgurić
• Mentor: Tatjana Haramina (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-03-02, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Kompoziti ojačani staklenim vlaknima hibridizirani su lanenim. Provedena je analiza rasteznih svojstava i svojstva gorivosti u ovisnosti o vrsti i slaganju ojačala. Za potrebe ispitivanja mehaničkih svojstava postupkom potlačnog ulijevanja dobivene su dvije vrste kompozita: prvi kompozit sastoji se od četiri sloja vlakana sa staklenim vlaknima u vanjskom sloju i lanenim u sredini. Drugi kompozit sastoji se samo od četiri sloja staklenih vlakana. Kompoziti su povezani epoksidnom smolom. Na njima su provedena ispitivanja u skladu s normom HRN EN ISO 527 – 4: 1997 Plastika – Određivanje rasteznih svojstava – 4. dio: Uvjeti ispitivanja izotropnih i ortotropnih plastičnih kompozita ojačanih vlaknima. Određene su vrijednosti rastezne čvrstoće, rasteznog modula elastičnosti i konačnog istezanja. Rezultati su uspoređeni s minimalnim zahtjevima Hrvatskog registra brodova (HRB) za kompozite ojačane staklenim vlaknima. Rezultati su pokazali da oba kompozita zadovoljavaju zahtjeve. Za potrebe ispitivanja gorivih svojstava postupkom ručne laminacije dobivene su dvije vrste kompozita ojačanih s dva sloja staklenih vlakana i tri sloja lanenih. Kod prvog su staklena tkanja u vanjskim slojevima i tri lanena između njih, dok su kod drugog naizmjenično slagana tkanja, počevši i završivši s lanenim. Ispitivanje je provedeno prema normi DIN 53 438, na dva načina za obje vrste kompozita: I. izlaganje ruba plamenu, gdje su rezultati pokazali da će kompozit s lanenim vlaknima u vanjskom sloju brže gorjeti i II. površinsko izlaganje plamenu, pri kojem nije došlo do zapaljenja ni kod jednog kompozitnog materijala.

Abstract (english)

Composites reinforced with glass fibers are hybridized with flax. An analysis of tensile properties and fire properties were made depending on the type and stacking of the reinforcements. For the purposes of testing the mechanical properties, two types of composites were obtained by the vacuum infusion: the first composite was made of four layers of fibers with glass fibers in the outer layer and flax fibers in the middle. The second composite was made of four layers of glass fibers only. Composites are connected with epoxy resin. Tests were conducted on them in accordance with the standard HRN EN ISO 527 – 4: 1997 Plastics – Determination of tensile properties – Part 4: Test conditions for isotropic and orthotropic fiber – reinforced plastic composites. The values of tensile strength, tensile modulus of elasticity and ultimate elongation were determined. The results were compared with the minimum requirements of the Croatian Register of Shipping (CRS) for composites reinforced with glass fibers. The results showed that both composites meet the requirements. For the purposes of testing fire properties, two types of composites were made by manual lamination. In the first one, there are glass weaves in the outer layers and three linens between them, while in the second one, the weaves are arranged alternately, starting and ending with the linen. The test was carried out according to DIN 53 438, in two ways for both types of composites. Firstly, exposing the edge to a flame, where the results showed that the composite with flax fibers in outer layer will burn faster and secondly, surface exposure to flame, during which no composite material ignited.

• Keywords: Hibridni kompoziti; staklena vlakna; lanena vlakna; epoksidna smola; rastezna čvrstoća; rastezni modul elastičnosti; goriva svojstva.
• Keywords (english): Hybrid composite; glass fibers; flax fibers; epoxy resin; tensile strength; tensile modulus of elasticity; fire properties.
• Language: croatian
• URN:NBN: urn:nbn:hr:235:713275
• Study programme: Title: Mechanical Engineering; specializations in: Design, Process and Energy Engineering, Production Engineering, Engineering Modelling and Computer Simulation, Marine Engineering, Industrial Engineering and Management, Materials Engineering; Course: Materials Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2023-02-22 21:05:44