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doctoral thesis
Modificirano hidraulično udubljivanje na sferi
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2009. urn:nbn:hr:235:832417
Škunca, Marko
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Institutional repository: Repository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb

Cite this document

Škunca, M. (2009). Modificirano hidraulično udubljivanje na sferi (Doctoral thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:832417

Škunca, Marko. "Modificirano hidraulično udubljivanje na sferi." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2009. https://urn.nsk.hr/urn:nbn:hr:235:832417

Škunca, Marko. "Modificirano hidraulično udubljivanje na sferi." Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2009. https://urn.nsk.hr/urn:nbn:hr:235:832417

Škunca, M. (2009). 'Modificirano hidraulično udubljivanje na sferi', Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 26 November 2024, https://urn.nsk.hr/urn:nbn:hr:235:832417

Škunca M. Modificirano hidraulično udubljivanje na sferi [Doctoral thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2009 [cited 2024 November 26] Available at: https://urn.nsk.hr/urn:nbn:hr:235:832417

M. Škunca, "Modificirano hidraulično udubljivanje na sferi", Doctoral thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2009. Available at: https://urn.nsk.hr/urn:nbn:hr:235:832417

Metadata
TitleModificirano hidraulično udubljivanje na sferi
Title (english)Modified hydraulic bulging on the sphere
AuthorMarko Škunca
MentorMiljenko Math (mentor)
Committee memberMladen Šercer (predsjednik povjerenstva)
Committee memberMiljenko Math (član povjerenstva)
Committee memberZdravko Virag (član povjerenstva)
Committee memberJanoš Kodvanj (član povjerenstva)
Committee memberBranko Grizelj (član povjerenstva)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2009-09-03, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Universal decimal classification
(UDC)		53 - Physics
620 - Materials testing. Power stations. Economics of energy
621 - Mechanical engineering. Nuclear technology. Machinery
Abstract
U radu je predložena nova metoda snimanja krivulje plastičnog tečenja pod nazivom modificirano hidraulično udubljivanje na sferi. Metoda je izvedena iz postupka hidrauličnog udubljivanja. Na napravi izrađenoj za oba navedena postupka, snimljene su krivulje plastičnog tečenja aluminijskog lima. Kako bi se mogle usporediti dvije metode, izvedeni su za to prikladni izrazi; za kinematiku i pripadajuća naprezanja. U oba slučaja korištena je pretpostavka membranskih naprezanja u limu i izvedeni su uvjeti plastičnog tečenja, neophodni za snimanje krivulje plastičnog tečenja. Usporedbom korištenih metoda ukazano je na prednosti modificirane metode. Uz analitički pristup problemu te provedene eksperimente, rezultati su modelirani i metodom konačnih elemenata. Modificirani postupak se pokazao primjerenim i za provjeru numeričkog modela, jer omogućava izravno mjerenje naprezanja u materijalu što nije moguće kod klasičnog hidrauličnog udubljivanja.
Abstract (english)
In the paper, an original method of the stress-strain diagram acquisition named modified hydraulic bulging on the sphere is introduced. The method has been derived from the hydraulic bulging test. True stress-strain curves were established for aluminium sheet on the experimental apparatus designed for both methods. For the purpose of comparing the two research methods, appropriate expressions, i.e. expressions for kinematics and particular equivalent stresses, were derived. In both cases, the assumption of the membrane stress state was used and the flow rule was determined, which was necessary for establishing the true stress-strain curve. The comparison between the used methods has shown the advantages of the modified method. Besides the analytical approach and the conducted experiments, the results were modelled using the finite element method. The modified method has proved to be adequate for checking the numerical model, because it enables direct experimental measurement of the true stresses in the material, which cannot be done when the classical hydraulic bulging test is used.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:832417
Study programmeTitle: Mechanical Engineering and Naval Architecture
Study programme type: university
Study level: postgraduate
Academic / professional title: doktor/doktorica znanosti, područje tehničkih znanosti (doktor/doktorica znanosti, područje tehničkih znanosti)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2020-12-30 12:37:00