Analiza čvrstoće konstrukcijskih detalja na brodovima građenim od biokompozita

undergraduate thesis

• Title (english): Strength analysis of structural details on ships made of biocomposites
• Author: Nikola Budak
• Mentor: Smiljko Rudan (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2023-09-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Shipbuilding; Constructive of Floating and Maritime Structures

Abstract

Kompoziti ojačani staklenim vlaknima već desetljećima drže primat u izradi malih i srednjih brodova. Porastom osvještenosti utjecaja svake grane industrije, pa tako i brodograđevne, na okoliš posljednjih se godina sve aktivnije traži alternativa koja će parirati kompozitima izrađenim od staklenih vlakana po cijeni, mehaničkim svojstvima, dostupnosti i otpornosti kako bi se našao materijal koji ima manji ugljični otisak u proizvodnji, može se reciklirati i nije opasan za rukovanje. Jedan od prominentijih kandidata da zamijeni korištenje staklenih vlakana kao ojačalo jesu prirodna lanena vlakna. Kako je iskustvo njihovog korištenja u industriji znatno oskudnije, EU je sufinancirala projekt izrade ekološki prihvatljivog katamarana PROeco tvrtke Marservis d.o.o. koji koristi biokompozit izrađen od biorazgradive epoksidne smole ojačane lanenim vlaknima za izradu nadgrađa katamarana. Cilj ovog rada bio je proračunati trupove katamarana metodom konačnih elemenata i tako se nadovezati na radove drugih kolega u nakani da se dokaže mogućnost korištenja biokompozita s lanenim vlaknima i za izradu trupova katamarana koji podliježu znatno strožim kriterijima Hrvatskog registra brodova. U tu svrhu prvo je napravljena validacija podataka dostavljenih od strane proizvođača lanenih ojačala sa podacima dobivenih eksperimentalnim putem na FSB-u. Potom su ti podaci bili korišteni u proračunima za određivanje potrebnih sastava biokompozitnih laminata za pojedine segmente trupa. kada su određeni sastavi laminata, napravljen je globalni proračun cijelog trupa metodom konačnih elemenata na opterećenja danim od strane registra, a posebno su proračunati konstrukcijski detalji koji su u procesu određeni kao kritični metodom podmodeliranja.

Abstract (english)

For decades glass fiber reinforced composites have been extensively used for construction of small and medium sized vessels. With the rise of environmental awareness, in all industries including shipbuilding, new, more sustainable composites are being sought to replace the glass fiber reinforced composites. These new materials should have equal or better mechanical properties, price, availability, and resilience. They should also be recyclable and safe to use and work with. One of the more prominent candidates to replace the use of glass fibers are natural linen fibers. To build experience in the use of linen fiber composites, the EU has funded a project to build environmentally sustainable catamaran ProEco by company Marservis d.o.o. The catamaran superstructure is made from bio composites with biodegradable epoxy resin reinforced with linen fibers. The goal of this thesis is to determine layers of bio composites needed for the laminates to be used in production of catamaran hull using the Finite element method (FEM) and to build upon the previous work from other students in an attempt to prove the viability of linen reinforced bio composites in ship design. The catamaran design must comply with the strict criteria of Croatian register of shipping. Data obtained from the composite manufacturer is validated with experimental data obtained from the other research papers written by faculty colleagues. Furthermore, this data is then used in calculations conducted to determine the bio composite laminate properties of individual hull segments. Then, with known laminate properties global analysis of the hull is conducted using FEM. The loads used in the analysis are taken from the Croatian register of shipping. Hull components that were deemed critical were submodeld and analyzed.

• Keywords: mala brodogradnja; lanena vlakna; metoda konačnih elemenata; tehnika podmodeliranja
• Keywords (english): small shipbulding; flax fibers; finite element method; sumbodeling
• Language: croatian
• URN:NBN: urn:nbn:hr:235:743973
• 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: 2023-09-27 09:37:06