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Razvoj brezmrežne numerične metode za reševanje tri-dimenzionalnih elasto-plastičnih problemov
ID Vuga, Gašper (Author), ID Šarler, Božidar (Mentor) More about this mentor... This link opens in a new window

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Abstract
Vroče valjanje jekla je kompleksen fizikalen proces, ki zahteva sklopljeno termo-elasto-plastično obravnavo. V okviru magistrskega dela smo v obstoječe programsko okolje, s katerim na brezmrežni način rešujemo parcialne diferencialne enačbe, implementirali modul, ki omogoča iterativno reševanje nelinearnih elasto-plastičnih problemov. Predpostavili smo von Misesov model izotropnega utrjevanja v približku majhnih deformacij. Za krajevno diskretizacijo smo uporabili lokalno kolokacijsko metodo z poliharmoničnimi radialnimi baznimi funkcijami. Za reševanje konstitutivnih enačb smo implementirali algoritem projekcije na najbližjo točko. Algoritem smo verificirali na primeru natezno obremenjene kocke. Rešitev smo primerjali z rezultati komercialnega paketa Abaqus in ugotovili dobro ujemanje. Razviti algoritem lahko uporabimo kot osnovo za vgradnjo v simulacijski sistem za vroče valjanje.

Language:Slovenian
Keywords:numerično modeliranje procesov, termo-mehanski sistemi, brezmrežne numerične metode, radialne bazne funkcije, algoritem s povratno preslikavo, vroče valjanje
Work type:Master's thesis/paper
Typology:2.09 - Master's Thesis
Organization:FS - Faculty of Mechanical Engineering
Place of publishing:Ljubljana
Publisher:[G. Vuga]
Year:2019
Number of pages:XX, 56 str.
PID:20.500.12556/RUL-109731 This link opens in a new window
UDC:004.942:519.876.5:621.771(043.2)
COBISS.SI-ID:16930331 This link opens in a new window
Publication date in RUL:07.09.2019
Views:1052
Downloads:259
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Secondary language

Language:English
Title:Development of a meshless numerical model for solving three-dimensional elasto-plastic problems
Abstract:
Hot rolling of a steel is coplex physical proccess that requires coupled thermo-elasto-plastic treatment. In this master thesis we implemented a module in the existing software environment, with which we solve partial differential equations in a meshless manner, that allows iterative solving of nonlinear elasto-plastic problems. We have assumed von Mises model with isotropic hardening and small strain approximation. For space discretization we used local colocation method with polyharmonic radial basis functions. For solving constitutive equations we implemented closest point projection alghoritm. We verificated our alghoritm on a case of a tensionally loaded cube. The solution was compared with commercial package Abaqus and found to have a good fit. Developed alghoritm can be used as a basis for implementation in a simulation system for hot rolling.

Keywords:numerical modelling of processes, thermo-mechanical systems, meshless numerical methods, radial basis functions, return mapping alghoritm, hot rolling

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