Ispitivanje utjecaja modela očvršćenja materijala na inkementalno oblikovanje lima

undergraduate thesis

• Title (english): Influence of material hardening model on incremental sheet forming
• Author: Luka Kuzmić
• Mentor: Lana Virag (mentor)
• Granter: University of Zagreb; Faculty of Mechanical Engineering and Naval Architecture; Zagreb
• Defense date and country: 2025-02-25, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mechanical Engineering

Abstract

Inkrementalno oblikovanje lima je nova, jeftina tehnologija oblikovanja lima koja se koristi za izradu složenih trodimenzionalnih geometrija. Cilj rada je analizirati utjecaj modela očvršćenja materijala tijekom inkrementalnog oblikovanja lima, odnosno dolazi li kod ovakvog opterećenja do Bauschingerovog efekta. Proces inkrementalnog oblikovanja lima modeliran je na tankoj gredi izrađenoj od aluminijske linearno elastične - nelinearno očvršćujuće legure. Za opterećenje su, analogno postupku inkrementalnog deformiranja, zadani mali pomaci u nekoliko koraka u blizini rubnog uvjeta, čime se osigurava da će doći do plastične deformacije. Oblik deformirane geometrije ovisi o lokacijama opterećenja i iznosima pomaka. Modelirana je geometrija s konstantnim kutom te s povećanjem i smanjenjem kuta deformirane geometrije. Analizirana je raspodjela naprezanja i deformacija u određenim točkama tijekom cijelog procesa inkrementalnog oblikovanja lima. Tijekom numeričke analize korištene su dvije vrste očvršćenja, izotropno i kinematičko, te je prikazana njihova usporedba. Na kraju je objašnjeno dolazi li do Bauschingerovog efekta i koji je njegov značaj.

Abstract (english)

Incremental sheet forming is a new, cost-effective sheet metal forming technology used for creating complex three-dimensional geometries. The aim of this work is to analyze the influence of material hardening models during incremental sheet forming, specifically whether the Bauschinger effect occurs under such loading conditions. The incremental sheet forming process is modeled on a thin beam made of aluminum alloy with linear elastic - nonlinear hardening properties. For loading, analogous to the incremental deformation process, small displacements are applied in several steps near the boundary condition, ensuring plastic deformation will occur. The shape of the deformed geometry depends on the loading locations and displacement magnitudes. Geometry with constant angle, as well as with increasing and decreasing angles of the deformed geometry, is modeled. The distribution of stresses and strains at specific points throughout the entire incremental sheet forming process is analyzed. During the numerical analysis, two types of hardening are used, isotropic and kinematic, and their comparison is presented. Finally, it is explained whether the Bauschinger effect occurs and what its significance is.

• Keywords: inkrementalno oblikovanje; očvršćenje materijala; Bauschingerov efekt; metoda konačnih elemenata.
• Keywords (english): incremental forming; material hardening; Bauschinger effect; finite element method.
• Language: croatian
• URN:NBN: urn:nbn:hr:235:766802
• Study programme: Title: Mechanical Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka strojarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-02-21 20:32:05