Numerički proračun čvrstoće kompozitnih nosača prednjeg i stražnjeg krila natjecateljskog vozila Formule Student

master's thesis

• Title (english): Numerical strength analysis of the front and rear wing composite supports of the Formula Student competing vehicle
• Author: Daniel Tomšić
• Mentor: Darko Ivančević (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2024-07-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering; General Mechanical Engineering (Construction)

Abstract

Cilj ovog diplomskog rada je numerički proračun čvrstoće kompozitnih nosača prednjeg i
stražnjeg krila bolida Formule Student. U radu je izrađen numerički model nosača te je
provedena analiza metodom konačnih elemenata korištenjem programskog paketa Abaqus.
Prethodno su korištenjem simulacija računalne mehanike fluida dobivene aerodinamičke sile
uzgona i otpora koje djeluju na prednje i stražnje krilo pri krajnjoj brzini bolida (120 km/h).
Pretpostavljena je jednolika raspodjela tlaka po površini krila, pa je u numeričkom modelu
ramenjača oba krila opterećena aerodinamičkim silama.
Detaljno su opisani korišteni kompozitni materijali te osnovni pojmovi iz mehanike kompozita
poput kriterija popuštanja Hashin, Tsai-Hill i Tsai-Wu na kojima se i temelji proračun čvrstoće.
Osim proračuna čvrstoće za već postojeći inicijalni raspored slojeva, provedeni su proračuni i
za druge rasporede slojeva koji se međusobno razlikuju po broju slojeva, orijentaciji slojeva te
debljini jezgre, u svrhu povećanja krutosti i čvrstoće te smanjenja mase kompozitne
konstrukcije.
Rezultati analize pokazali su da inicijalni raspored slojeva kod nosača prednjeg i stražnjeg krila
slojeva ne zadovoljava kriterije čvrstoće, no izmjenom rasporeda slojeva postignuta su ne samo
zadovoljavajuća mehanička svojstva već je i smanjena masa oba nosača.

Abstract (english)

This Master's Thesis deals with the numerical structural analysis of the composite front and rear
wing supports of the Formula Student competing vehicle. A numerical model of the supports
was made and the analysis was carried out using the Finite Element Method and the Abaqus
software.
Prior to strength analysis, aerodynamic loads were determined using the Computational Fluid
Dynamics simulations, and negative lift and drag force acting on the wings at maximum
achievable speed (120 km/h) were calculated. Homogenous pressure distribution was assumed
along the wing span, so in the numerical model wing spar of both wings was loaded with
aerodynamic forces.
Composite materials used in structure were described in detail as were the basic terms and
relations from composite mechanics, such as Hashin, Tsai-Hill and Tsai-Wu failure criteria on
which this analysis is based on.
Besides the analysis of the initial composite layup, additional analyses was carried out on
modified composite layups which differ by the number of layers, layer orientation and core
thickness in view of improving structural rigidity, strength and weight reduction of the
composite structure.
Analysis results showed that the initial composite layup of both front and rear carriers, does not
satisfy failure criteria, although satisfactory failure criteria values and significant weight
reduction were achieved by modifying the composite layups.

• Keywords: kompozitne konstrukcije; nosači krila; raspored slojeva; numerička analiza čvrstoće
• Keywords (english): composite structures; wing carriers; layup; numerical structural analysis
• Language: croatian
• URN:NBN: urn:nbn:hr:235:944113
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-07-15 10:43:43