Konstruiranje i proračun kompozitnih poluvratila za natjecateljsko vozilo FSB Racing Team-a

undergraduate thesis

• Title (english): Design and analysis of composite halfshafts for FSB Racing Team competing vehicle
• Author: Jakov Ratković
• Mentor: Darko Ivančević (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2020-02-27, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Inovativnim rješenjima, odnosno uporabom inovativnih materijala, nastoji se ostvariti jedan od ciljeva kojemu teže svi timovi koji su sudionici Formula Student natjecanja - smanjenje ukupne mase natjecateljskog vozila.
Pogonske osovine, odnosno vratila – poluvratila, element su kod kojega je ostvariva značajna ušteda na masi prelaskom sa čelika na kompozitni materijal – ugljičnim vlaknima ojačanu smolu (eng. CFRP – Carbon Fiber Reinforced Polymer).
Analitički je, pomoću relacija koje slijede iz teorije ljusaka i mehanike kompozitnih materijala, a iz zadanih polaznih veličina, određen srednji polumjer i broj slojeva koji su potrebni da kompozitna cijev izrađena od ugljičnih vlakana (T700) i epoksidne smole (DT120) zadovoljava kriterije popuštanja karakteristične za kompozitne materijale. Fleksijska kritična brzina vrtnje također je analitički određena. Zatim je koristeći programski paket Abaqus/Standard napravljen model i provedena statička numerička analiza metodom konačnih elemenata (MKE) kojom su potvrđene analitički dobivene dimenzije cijevi. Nakon toga, analitički su određene a potom i numerički potvrđene potrebne dimenzije prirubnica – nosača tripoidnih križeva. Predstavljena su moguća rješenja spajanja cijevi i prirubnica. Odabirom lijepljenog spoja kao najpovoljnije opcije, pomoću analitičkih su izraza određene potrebne dimenzije ovog spoja i samih prirubnica, odnosno elemenata koji prenose torzijski moment sa cijevi na tripoidne križeve i obrnuto. Konačno, naprezanja u spoju također su analizirana MKE metodom koristeći programski paket Abaqus/Standard.

Abstract (english)

With innovative solutions, by using innovative materials, it is tried to achieve one of the goals
all teams participating in a Formula Student competition are striving for – reducing the overall
mass of the competing vehicle.
Propelling shafts, i.e. halfshafts, are elements that offer a significant mass reduction by
altering the material they are made of from steel to a composite material – carbon fibre
reinforced polymer (CFRP).
Firstly, from input data, using relations based on theory of shell structures and classical
lamination theory, the mean radius and the number of plies in a composite tube made of
carbon fibre (T700) and epoxy resin (DT120) have been analytically determined so that the
composite materials failure criteria are satisfied. Flexural critical speed has also been
analytically determined. After that, using the Abaqus/Standard software, a model was created
and a numerical static analysis using finite element method (FEA) was performed in order to
confirm the analytically obtained results. Then dimensions of the steel adherends were
analytically obtained and then numerically validated. The possible solutions for connecting
the tube with adherends were presented. After choosing the adhesive joint as an optimal
solution, using analytical relations, dimensions of the joint itself and the steel adherends, (i.e.
the elements that are transferring the torsional load from the composite tube to the tripoid
joints and vice versa) have been determined. Finally, stresses in the adhesive joints were
analysed using FEA in Abaqus/Standard as well.

• Keywords: Vratilo; poluvratilo; poluosovina; kompozitni materijali; ušteda na masi; CFRP; Formula Student.
• Language: croatian
• URN:NBN: urn:nbn:hr:235:372970
• 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: 2020-02-24 11:13:18