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undergraduate thesis
Usporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. urn:nbn:hr:235:932380
Osmak, Fran
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

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

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Osmak, F. (2017). Usporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima (Undergraduate thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:932380

Osmak, Fran. "Usporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:932380

Osmak, Fran. "Usporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima." Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2017. https://urn.nsk.hr/urn:nbn:hr:235:932380

Osmak, F. (2017). 'Usporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima', Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 02 November 2024, https://urn.nsk.hr/urn:nbn:hr:235:932380

Osmak F. Usporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima [Undergraduate thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2017 [cited 2024 November 02] Available at: https://urn.nsk.hr/urn:nbn:hr:235:932380

F. Osmak, "Usporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima", Undergraduate thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2017. Available at: https://urn.nsk.hr/urn:nbn:hr:235:932380

Metadata
TitleUsporedba različitih teorija plastičnosti u analizi postupaka elasto-plastičnog oblikovanja valjcima
Title (english)Comparison of different plasticity theories in analysis of elasto-plastic roller bending
AuthorFran Osmak
MentorNeven Hadžić (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2017-07-05, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Shipbuilding
Abstract
Oblikovanje limova valjcima složen je tehnološki postupak brodograđevnog procesa. Cilj svakog tehnološkog procesa povećanje je uporabne vrijednosti materijala koji se obrađuje, a da bi se to ostvarivalo u što većoj mjeri, bitno je tehnološke postupke provoditi kvalitetno, odnosno što brže uz što manju potrošnju resursa. Kako bi se moglo uopće pristupiti povećanju efikasnosti bilo kojeg tehnološkog procesa, pa tako i oblikovanja, neophodno je uz kvalitetnu teoretsku osnovu provesti matematički proračun. No, proračun takvog tipa nije uvijek određen jednoznačnim teorijama i jednadžbama. Nepoznata krivulja naprezanja u ovisnosti o deformaciji u plastičnom području uzrok je toj nejednoznačnosti u kontekstu oblikovanja limova. Iz tog razloga postoji više teorija o obliku te krivulje koja je presudna za poznavanje momenata, sila i energija, odnosno resursa potrebnih za obavljanje složene zadaće oblikovanja limova. Koristeći klasičnu Euler-Bernoullijevu teoriju o savijanju, u ovom Radu uspoređuju se tri različita modela opisivanja krivulje plastičnosti. Radi se o elastično idealno-plastičnom, elastično linearno-plastičnom te elastično nelinearno-plastičnom modelu. Na kraju, sukladno provedenom proračunu, došlo se do nekoliko bitnih zaključaka o kvaliteti pojedinih modela plastičnosti.
Abstract (english)
Roller sheet shaping is one of the more complex technological feats in the shipbuilding process. The main objective of every technological process is to increase the usable value of the materials which are being processed. In order to achieve that, it is important to execute those technological processes in a high-quality manner, meaning as fast as possible with as little resource consumption as possible. In the interest of the mentioned above, it is necessary to conduct a mathematical calculation, while maintaining a high quality theoretical background. However, such calculations are not always definite. Uncertain trend of the stress-strain curve in the plastic region of the homonymous diagram is the reason for the mentioned ambiguity in the context of metal sheet shaping. For that reason, there are several theories on the shape of that curve, which is so crucial in comprehending the amount of torque, force and energy, i. e. resources needed for completing such a complex job. By using the standard Euler-Bernoulli bending theory, this Thesis compares three different models of plasticity curves. More specifically, it gives comparison between elastic ideally-plastic, elastic linear-plastic and an elastic nonlinear-plastic model. In the end, with accordance to the completed calculation, some significant conclusions were drawn regarding the quality of each plasticity model.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:932380
Study programmeTitle: Naval Architecture
Study programme type: university
Study level: undergraduate
Academic / professional title: sveučilišni prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka brodogradnje (sveučilišni prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka brodogradnje)
Type of resourceText
File originBorn digital
Access conditionsOpen access
Terms of useLicence In copyright icon
Created on2019-05-27 14:03:43