prikaz prve stranice dokumenta Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials
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master's thesis
Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials
2021. urn:nbn:hr:179:864472
Prcela, Ivan
University of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture
Department of Mechanical Engineering and Naval Architecture

Cite this document

Prcela, I. (2021). Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials (Master's thesis). Retrieved from https://urn.nsk.hr/urn:nbn:hr:179:864472

Prcela, Ivan. "Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials." Master's thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:179:864472

Prcela, Ivan. "Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials." Master's thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, 2021. https://urn.nsk.hr/urn:nbn:hr:179:864472

Prcela, I. (2021). 'Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials', Master's thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, accessed 24 March 2023, https://urn.nsk.hr/urn:nbn:hr:179:864472

Prcela I. Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials [Master's thesis]. Split: University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture; 2021 [cited 2023 March 24] Available at: https://urn.nsk.hr/urn:nbn:hr:179:864472

I. Prcela, "Analysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials", Master's thesis, University of Split, Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture, Split, 2021. Available at: https://urn.nsk.hr/urn:nbn:hr:179:864472

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Metadata
TitleAnalysis of the influence of the yielding asymmetry on the mechanical behaviour of isotropic materials
Title (croatian)Analiza utjecaja asimetrije naprezanja tečenja na mehaničko ponašanje izotropnih materijala
AuthorIvan Prcela
MentorVedrana Cvitanić https://orcid.org/0000-0002-1277-0323 (mentor)
MentorMarta Cristina Cardoso de Oliveira https://orcid.org/0000-0001-8032-7262 (komentor)
GranterUniversity of Split
Faculty of Electrical Engineering, Mechanical Engineering and Naval Architecture
(Department of Mechanical Engineering and Naval Architecture)
Split
Defense date and country2021-09-23, Croatia
Scientific / art field,
discipline and subdiscipline		TECHNICAL SCIENCES
Mechanical Engineering
General Mechanical Engineering (Construction)
Abstract
The main objective of the work is the analysis of the Cazacu (2006) yield function, capable of describing the yielding asymmetry. The isotropic and anisotropic form of the function, with one or with two linear transformations of stress tensor, are presented. The flexibility of the considered yield functions in predicting the yield stress ratios is examined. It was concluded that isotropic material impose constraints such that the two linear transformations do not increase the function flexibility. Simulations of the cylindrical cup deep drawing process are performed with the finite element program "DD3IMP" using the material model based on the analysed isotropic yield function. Predictions of cup height, punch force and thickness obtained with the isotropic yield function considering various values for the tension - compression yield stress ratio are considered. The strain and stress states evolutions during the forming process, in selected integration points, are examined. This analysis allows determining the influence of the yield stress asymmetry on the cup drawing predictions. The results show that even small changes in the tension - compression yield stress ratio can influence the strains distribution, in isotropic materials. In fact, for low values of this stress ratio the wall can present thickness values lower than the ones attained with the von Mises material, becoming the critical point of the component.
Abstract (english)
U ovom radu analizira se Cazacu (2006) funkcija tečenja koja je prikladna za opis ponašanja materijala koji pokazuju asimetriju u naprezanju tečenja. Razmatra se izotropan i anizotropan oblik funkcije, s jednom ili s dvije linearne transformacije tenzora naprezanja. Ispitana je fleksibilnost razmatrane funkcije tečenja u predviđanju omjera naprezanja tečenja. Zaključeno je da zbog ograničenja koja vrijede za izotropan materijal pristup s dvije transformacije u razmatranoj funkciji ne povećava njezinu fleksibilnost. Simulacije postupka dubokog vučenja cilindrične posudice provedene su programom koji se temelji na metodi konačnih elemenata "DD3IMP" i korištenjem modela materijala koji pretpostavlja analiziranu izotropnu funkciju tečenja. Analizirana su predviđanja visine posudice, sile utiskivanja trna i raspodjele debljine dobivena razmatranom izotropnom funkcijom tečenja definiranom različitim vrijednostima omjera naprezanja tečenja u vlaku i tlaku. Razmatran je razvoj stanja naprezanja i deformacija s napredovanjem deformacije u odabranim integracijskim točkama. Provedenom analizom procijenjen je utjecaj asimetrije naprezanja tečenja na predviđanja postupka dubokog vučenja posudice. Rezultati pokazuju da čak i mala promjena omjera naprezanja tečenja u vlaku i tlaku može utjecati na raspodjelu deformacija u izotropnom materijalu. Također za male vrijednosti ovog omjera u dijelu stijenke posudice predviđaju se vrijednosti debljine manje od onih koje su predviđene pomoću von Mises funkcije tečenja, stoga taj dio postaje kritična točka proizvoda.
Keywords
Keywords (english)
Languageenglish
URN:NBNurn:nbn:hr:179:864472
Study programmeTitle: Mechanical Engineering; specializations in: Structures and Energy Technology, Computer Aided Design and Engineering, Production Mechanical Engineering
Course: Structures and Energy Technology
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 authenticated users
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Created on2022-11-07 11:56:31