Numerička analiza čvrstoće drvene i kompozitne konstrukcije krila malog aviona

master's thesis

• Title (english): Numerical strength analysis of a wooden and a composite wing structure
• Author: Ivan Radošević
• Mentor: Darko Ivančević (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2018-07-12, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Aviation, Rocket and Space Technology

Abstract

Cilj ovog diplomskog rada je usporedba svojstava drvene i kompozitne konstrukcije krila malog aviona najveće poletne mase do 450 kg. Konstrukcija krila je preuzeta iz besplatnih nacrta za ultralaki avion drvene konstrukcije Chilton DW-1, namijenjen za samogradnju. Prema tehničkoj dokumentaciji izrađen je CAD model krila u programu Solidworks, pri čemu su uvedena pojednostavnjenja i prilagodbe na geometriji u cilju bolje diskretizacije numeričkog modela. Potom je na temelju prvotnog modela izrađen izmijenjeni model krila kojem je dio drvenih komponenata zamijenjen kompozitima. U programu Abaqus/Standard provedena je statička numerička analiza obiju konstrukcija. Iznosi faktora normalnog opterećenja preuzeti su iz karakterističnih točaka V-n dijagrama prema EASA-inim normama. Raspodjela aerodinamičkog opterećenja modelirana je prema podacima dobivenim analizom u programu XFLR5. Na modelu kompozitne konstrukcije krila je zatim provedeno dimenzioniranje komponenata prema Hashinovom kriteriju popuštanja do postizanja željene čvrstoće, nakon čega je uspoređena ukupna masa drvene i kompozitne konstrukcije krila.

Abstract (english)

The aim of this thesis is to make an FEM model of an existing wooden wing design for an aircraft with a MTOW of less than 450kg, and to compare its mechanical properties to those of an equivalent composite wing design. The wooden wing of a Chilton DW.1, a light racing aircraft designed for homebuilding, has been used as a basis for the CAD wing model. The model was designed using Solidworks, with many details simplified to facilitate mesh discretization with a minimum of distorted elements. A second wing model was then designed by replacing the main load-bearing members of the first model with equivalent members made of carbon fibre-epoxy composites. Both models were imported into Abaqus/Standard to perform static FEM analyses. The load factors used in the analysis were obtained from EASA regulations. The wing lift distribution was modeled according to results obtained by a flow analysis performed using XFLR5. The composite components were then sized according to Hashin failure criteria, with the aim to withstand the assigned loads with no damage initiation occurring.

• Keywords: konstrukcija krila; ultralaki avion; metoda konačnih elemenata; drvena konstrukcija; kompozit
• Keywords (english): wing; finite element method; wooden structure; composites
• Language: croatian
• URN:NBN: urn:nbn:hr:235:548090
• Study programme: Title: Aeronautical Studies; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva (magistar/magistra inženjer/inženjerka zrakoplovnog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2019-05-28 09:45:52