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master's thesis
Numerička simulacija postupka kutne ekstruzije
Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. urn:nbn:hr:235:822174
Rožman, Mirko
University of Zagreb
Faculty of Mechanical Engineering and Naval Architecture

Cite this document

Rožman, M. (2018). Numerička simulacija postupka kutne ekstruzije (Master's thesis). Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture. Retrieved from https://urn.nsk.hr/urn:nbn:hr:235:822174

Rožman, Mirko. "Numerička simulacija postupka kutne ekstruzije." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:822174

Rožman, Mirko. "Numerička simulacija postupka kutne ekstruzije." Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, 2018. https://urn.nsk.hr/urn:nbn:hr:235:822174

Rožman, M. (2018). 'Numerička simulacija postupka kutne ekstruzije', Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, accessed 25 April 2024, https://urn.nsk.hr/urn:nbn:hr:235:822174

Rožman M. Numerička simulacija postupka kutne ekstruzije [Master's thesis]. Zagreb: University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture; 2018 [cited 2024 April 25] Available at: https://urn.nsk.hr/urn:nbn:hr:235:822174

M. Rožman, "Numerička simulacija postupka kutne ekstruzije", Master's thesis, University of Zagreb, Faculty of Mechanical Engineering and Naval Architecture, Zagreb, 2018. Available at: https://urn.nsk.hr/urn:nbn:hr:235:822174

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Metadata
TitleNumerička simulacija postupka kutne ekstruzije
Title (english)Numerical simulation of equal channel angular extrusion
AuthorMirko Rožman
MentorZdenka Keran (mentor)
GranterUniversity of Zagreb
Faculty of Mechanical Engineering and Naval Architecture
Zagreb
Defense date and country2018-12-06, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
Abstract
Kutna ekstruzija (eng. Equal Channel Angular Pressing, ECAP) glavni je predstavnik postupaka značajne plastične deformacije (eng. Severe Plastic Deformation, SPD). ECAP omogućava postizanje sitnozrnate mikrostrukture kod metalnih materijala, a samim time i poboljšanje njihovih mehaničkih svojstava. Kako bi se konstruirao alat za kutnu ekstruziju bitno je poznavati utjecaj konstrukcije samog alata na ponašanje i distribuciju deformacije u materijalu te nastala naprezanja. U ovome radu, numeričkim modeliranjem analiziran je utjecaj jednog od najbitnijih parametara ovoga procesa - kuta između ulaznog i izlaznog kanala matrice (Φ). U prvom dijelu rada ukratko je predstavljen postupak kutne ekstruzije te metoda konačnih elemenata. Zatim je ispitan utjecaj četiriju različitih konstrukcija alata na raspodjelu naprezanja prilikom obrade uzorka od čistog aluminija i prokomentirani su rezultati. Također, simulacija je provedena u dvodimenzionalnom i trodimenzionalnom sustavu te su uspoređeni dobiveni rezultati. Kao posljednji dio rada, eksperimentalno je proveden postupak kutne ekstruzije na aluminijskom uzorku i to u alatu s matricom čiji su ulazni i izlazni kanali pod kutom od 90°. Ovim eksperimentom izmjereni su slijedeći podaci: ovisnost sile oblikovanja o vremenu te tvrdoća uzorka prije i poslije deformacije. Na samom kraju prokomentirani su svi dobiveni rezultati te se na temelju usporedbe podataka svih analiza izvukao zaključak o pozitivnim i negativnim stranama pojedinih konstrukcija alata i pretpostavke o svojstvima materijala koja se mogu postići određenom konstrukcijom.
Abstract (english)
Equal Channel Angular Pressing – ECAP (or Equal Channel Angular Extrusion – ECAE) represents the main process of Severe Plastic Deformation – SPD processes. ECAP ensures refined grain microstructure to be achieved in metal materials, thus improving their mechanical properties. In order to design a die for ECAP, it is important to know the die design influence on behavior and distribution of stress and strain being imposed to material. In this paper, numerical modeling is used for analysis of influence of one of the most significant parameters of this process – the angle between channels of the die (Φ). At the beginning of paper, a short introduction about ECAP and Finite Element Method (FEM) is given. Then, analysis of influence of four different die designs is carried out and results are discussed. Stress distribution in these cases are investigated on pure aluminum workpiece. Furthermore, simulation is carried out in two-dimensional and threedimensional system and the results are compared. As a final part, an experiment of ECAP is carried out on an aluminum sample in a tool with an angle of 90° between channels of the die. This experiment is used to measure following information: deforming force over time distribution, and sample hardness before and after deformation. At the end, all obtained results are discussed and conclusion is extracted based on comparison of the results from all analyses. Positive and negative sides of each tool designs are given as well as assumptions on material properties that can be achieved with each design.
Keywords
Keywords (english)
Languagecroatian
URN:NBNurn:nbn:hr:235:822174
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 conditionsOpen access
Terms of useLicence In copyright icon
RepositoryRepository of Faculty of Mechanical Engineering and Naval Architecture University of Zagreb
Created on2019-05-24 12:38:25

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