Rastezna svojstva polimernih kompozita ojačanih lanenim vlaknima

undergraduate thesis

• Title (english): Tensile properties of polymer composites reinforced with flax fibers
• Author: Petar Dundović
• Mentor: Tatjana Haramina (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2022-09-28, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Lanena i staklena vlakna imaju usporediva mehanička svojstva, no povezivanje polarnih bioloških vlakana s apolarnom polimernom matricom predstavlja problem kod prenošenja opterećenja s matrice na ojačalo. U ovom radu istražen je utjecaj vrste smole i ojačala na rastezna svojstva kompozita. Epoksidna (EP) i poliesterska smola (UP) ojačane su lanenim i staklenim vlaknima. Načinjeni su kompoziti UP/lan, UP/staklo, EP/lan te dva kompozita EP/lan/staklo slagana na način da su staklena vlakna u jednom od njih u sredini, dok su kod drugog u blizini vanjskih ploha. Rezultati ispitivanja uspoređeni su s pravilima Hrvatskog registra brodova (HRB) za kompozite ojačane staklenim vlaknima. Rastezna svojstva istraženih kompozita bolja su od minimalnih propisanih vrijednosti s izuzetkom posljednjeg hibrida kod kojeg je došlo do grešaka pri izradi. Kompozit ojačan staklenim vlaknima superioran je kompozitima s lanenim vlaknima, što pokazuje važnost dobre povezanosti matrice i ojačala. Međutim rastezna svojstva kompozita s lanenim vlaknima također su u skladu s pravilima HRB-a.

Abstract (english)

Flax and glass fibers have comparable mechanical properties, but the adhesion of polar
biological fibers with an apolar polymer matrix presents a problem in transferring the load from
the matrix to the reinforcement. In this work, the influence of the type of resin and
reinforcement on tensile properties of composites was investigated. Epoxy (EP) and polyester
resin (UP) are reinforced with flax and glass fibers. Composites UP/flax, UP/glass, EP/flax and
two composites EP/flax/glass were prepared in such a way that the glass fibers in one of them
are in the middle plane, while in the other they are near the outer surfaces. The test results were
compared with the rules of the Croatian Register of Shipping (CRS) for composites reinforced
with glass fibers. The tensile properties of the investigated composites are better than the
minimum prescribed values, with the exception of the last hybrid composite, where
manufacturing errors occurred. Composites reinforced with glass fibers are superior to those
with flax fibers, which shows the importance of a good bonding between the matrix and the
reinforcement. However, the tensile properties of composites with flax fibers are also in
accordance with the CRS rules.

• Keywords: polimerni kompoziti; lanena vlakna; staklena vlakna; rastezna čvrstoća; rastezni modul
• Keywords (english): polymer based composites; flax fibers; glass fibers; hybrid composites; tensile strength; tensile modulus
• Language: croatian
• URN:NBN: urn:nbn:hr:235:958588
• Study programme: Title: Mechanical 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: 2022-09-22 07:02:06