Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara

Zubak, Jure

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master's thesis

Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara

Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2020. urn:nbn:hr:235:678407

Zubak, Jure

University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Cite this document

APA 6th Edition

Zubak, J. (2020). Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:678407

MLA 8th Edition

Zubak, Jure. "Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2020. https://urn.nsk.hr/urn:nbn:hr:235:678407

Chicago 17th Edition

Harvard

Zubak, J. (2020). 'Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 15 July 2024, https://urn.nsk.hr/urn:nbn:hr:235:678407

Vancouver

Zubak J. Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2020 [cited 2024 July 15] Available at: https://urn.nsk.hr/urn:nbn:hr:235:678407

IEEE

J. Zubak, "Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2020. Available at: https://urn.nsk.hr/urn:nbn:hr:235:678407

Cite this item: https://urn.nsk.hr/urn:nbn:hr:235:678407

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Metadata

Title	Numeričko modeliranje utjecaja geometrije jezgre sendvič konstrukcije na apsorpciju energije udara
Title (english)	Numerical modelling of the effect of sandwich structure core geometry on the impact energy absorption
Author	Jure Zubak
Mentor	Darko Ivančević (mentor)
Granter	University of Zagreb Faculty of Mechanical Engineering and Naval Architecture Zagreb
Defense date and country	2020-12-04, Croatia
Scientific / art field, discipline and subdiscipline	TECHNICAL SCIENCES Aviation, Rocket and Space Technology Aircraft Construction and Design
Abstract	U ovom radu bilo je potrebno izvršiti numeričko modeliranje kompozitnih sendvič konstrukcija te analizu udarnih oštećenja pri malim brzinama. Korištene su tri različite izvedbe jezgri. Prva je postojeća geometrija saća, druga je trapezna valovita jezgra, a treća jest trokutasta valovita jezgra. Materijal jezgre jest NOMEX, a vanjski slojevi izrađeni su od kompozita ojačanih ugljičnim vlaknima. Podaci o materijalima dobiveni su pretragom dostupne literature o navedenom području. Navedena je uloga sendvič kompozita u industriji. Potom je opisana konstrukcija sendvič kompozita, kao i različite izvedbe. Prikazani su modeli oštećenja vanjskih slojeva te jezgre, kao i svojstva materijala. Numeričko modeliranje udarnog oštećenja sastojalo se od variranja različitih brzina udara te visina jezgre za svaku pojedinu izvedbu. Validacija je izvedena usporedbom rezultata s eksperimentalnim rezultatima iz prethodno dostupnih radova. Zatim su prikazani rezultati apsorbiranih energija pomoću preostale kinetičke energije, energije koju je apsorbirala jezgra te energije koju su na sebe preuzeli vanjski slojevi. Spomenuti rezultati prikazani su u ovisnosti o vremenu udara. Nadalje, prikazani su i rezultati sila koje se prenose na ostatak konstrukcije u ovisnosti o vremenu udara. Rezultati su prikazani za sve analizirane kombinacije brzine udara, visine jezgre te izvedbe same jezgre. Na kraju je napravljena usporedba različitih izvedbi jezgre s obzirom na mogućnost apsorpcije energije te prenošenja sila na ostatak konstrukcije.
Abstract (english)	In this thesis it was necessary to deal with the numerical modelling of composite sandwich structures with induced low-velocity impact damage. Three different structures were analysed: the realistic honeycomb core, the corrugated trapezoidal structure and the triangular structure. The material of the core is NOMEX and the outer layers are made of carbon fiber reinforced polymer. The material data were collected by studying the relevant literature. In this thesis first the importance of sandwich composite panels is explained. Then the damage mechanisms of the outer layers and the core were presented. The numerical modeling of impact damages includes the analysis for many different impact energies as well as for several core dimensions. The validation of the numerical models was performed using available experimental data. The results were then presented using the remaining kinetic energy, the energy dissipated from the core and the energy dissipated from the outer layers. Then the forces on the rest of the structure were shown as a function of time. The results were shown for all impact velocities, dimensions of the core and the different concepts of the shape of the core. Finally, a comparison was made between different cores on their ability to absorb energy and to transfer forces to the rest of the structure.
Keywords
Keywords (english)
Language	croatian
URN:NBN	urn:nbn:hr:235:678407
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
Terms of use
Repository	Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb
Created on	2020-12-02 18:42:13