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master's thesis
Analiza izotropnosti mrežnih struktura
2018. urn:nbn:hr:190:791966
Sikirica, Ante
University of Rijeka
Faculty of Engineering
Department of Fluid Mechanics and Computational Engineering
Section of Computational Engineering

Cite this document

Sikirica, A. (2018). Analiza izotropnosti mrežnih struktura (Master's thesis). Rijeka: University of Rijeka, Faculty of Engineering. Retrieved from https://urn.nsk.hr/urn:nbn:hr:190:791966

Sikirica, Ante. "Analiza izotropnosti mrežnih struktura." Master's thesis, University of Rijeka, Faculty of Engineering, 2018. https://urn.nsk.hr/urn:nbn:hr:190:791966

Sikirica, Ante. "Analiza izotropnosti mrežnih struktura." Master's thesis, University of Rijeka, Faculty of Engineering, 2018. https://urn.nsk.hr/urn:nbn:hr:190:791966

Sikirica, A. (2018). 'Analiza izotropnosti mrežnih struktura', Master's thesis, University of Rijeka, Faculty of Engineering, accessed 28 July 2024, https://urn.nsk.hr/urn:nbn:hr:190:791966

Sikirica A. Analiza izotropnosti mrežnih struktura [Master's thesis]. Rijeka: University of Rijeka, Faculty of Engineering; 2018 [cited 2024 July 28] Available at: https://urn.nsk.hr/urn:nbn:hr:190:791966

A. Sikirica, "Analiza izotropnosti mrežnih struktura", Master's thesis, University of Rijeka, Faculty of Engineering, Rijeka, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:190:791966

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Metadata
TitleAnaliza izotropnosti mrežnih struktura
Title (english)Analysis of the grid structures isotropy
AuthorAnte Sikirica
MentorStefan Ivić (mentor)
MentorMarko Čanađija (komentor)
Committee memberKristian Lenić (predsjednik povjerenstva)
Committee memberRoberto Žigulić (član povjerenstva)
Committee memberOzren Bukovac (član povjerenstva)
GranterUniversity of Rijeka
Faculty of Engineering
(Department of Fluid Mechanics and Computational Engineering)
(Section of Computational Engineering)
Rijeka
Defense date and country2018-09-21, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Tijekom proteklih stotinjak godina razvijeni su i implementirani različiti pristupi dizajnu laganih struktura široke namjene. Aluminijske izorešetke najstariji su i najpoznatiji primjer mrežom ojačanih pločastih konstrukcija, no zbog visokih troškova proizvodnje dominantno su korištene u avionskoj i svemirskoj industriji. Zahvaljujući naprecima u inženjerskoj praksi, kao jeftina i efikasna alternativa javile su se kompozitne izvedbe u obliku sandwich struktura i mrežom ojačanih kompozitnih materijala. Posljedično, lagani konstrukcijski elementi izraženih mehaničkih svojstava postali su uobičajena pojava u brojnim industrijskim granam i građevini. Unatoč velikom interesu za razvitak mrežom ukrućenih struktura, dizajn je ostao uvelike nepromijenjen; ojačanja se formiraju ponavljanjem osnove ćelije koja najčešće ima trokutastu ili četverokutnu formu. U ovom radu predložen je alternativni pristup dizajnu mrežnih struktura. Trajektorije koje implementirani HEDAC model generira u kombinaciji s više-agentnim algoritmom za prekrivanje područja mogu se interpretirati kao dvodimenzionalne neuniformne mreže unaprijed definiranog poprečnog presjeka, te u ovisnosti o rezultantnim svojstvima mogu biti adekvatne alternative tradicionalnim 2D rešetkastim strukturama ili kao samostalni strukturni element za specifične slučajeve opterećenja. Ispravnost ove pretpostavke potvrdit će se usporedbom krutosti i elastičnosti različitih tipova mrežnih struktura pri različitim orijentacijama i opterećenjima. Rezultati su dobiveni primjenom metode konačnih elemenata, koristeći linearne gredne elemente kao temelj za evaluaciju mrežne strukture.
Abstract (english)
Throughout the past century, different approaches have been used in order to create widely applicable lightweight structures. Aluminium isogrid is the oldest and most well-known example of a grid stiffened plate, but due to high production costs, it was used primarily in aerospace industry. Thanks to engineering advancements, cheap and effective alternatives in the form of sandwich panels and composite grid stiffened structures have started emerging. Consequently, lightweight construction elements have become a common occurrence in a variety of industries, including civil engineering. Despite the increasing interest in grid stiffeners, grid design has remained relatively stagnant; stiffeners are formed through repetition of a basic cell, which tends to have a triangular or rectangular shape. This thesis therefore proposes an alternative approach to grid design. Trajectories generated by HEDAC model in conjunction with multi-agent coverage algorithm can be interpreted as two-dimensional nonuniform grids with fixed cross-section, and depending on the resulting properties, used as a valid alternative in grid stiffened structures or as a standalone structural element for specific load cases. Validity of this assumption is evaluated by comparing the stiffness and elaasticity of multiple types of grid structures in various orientations and subjected to different loads. The comparison is based on finite element analysis using linear beam elements as underlying model for grid segments.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:190:791966
Study programmeTitle: Mechanical Engineering
Study programme type: university
Study level: graduate
Academic / professional title: magistar/magistra inženjer/inženjerka strojarstva (magistar/magistra inženjer/inženjerka strojarstva)
Type of resourceText
File originBorn digital
Access conditionsAccess restricted to students and staff of home institution
Terms of useLicence In copyright icon
Created on2018-10-18 12:36:39