Model nanašanja in taljenja prahu na površini talilnega bazena

Peternel, Jaka (author), Govekar, Edvard (mentor), Otto, Andreas (co-mentor)

Numerično modeliranje industrijskih procesov je pomembno, ker omogoča hitrejši in cenejši razvoj učinkovitih inženirskih sistemov in procesov. Eno izmed trenutno hitro se razvijajočih področij so dodajne izdelovalne tehnologije, ki temeljijo na procesu laserskega direktnega navarjanja (LDN) kovinskega prahu. Da bi razvili numerični model procesa LDN je v tem delu obstoječi Eulerski model laserskega varjenja in rezanja po metodi končnih volumnov (glavni model) razširjen z Lagrangevim sledenjem delcev nanašajočega se prahu in njegovega pretaljevanja po metodi diskretnih elementov (model talečega se prahu). Nastanek navara je izveden s prenosom mase iz modela talečega se prahu v glavni model. Oba modela sta sklopljena tudi preko entalpije in gibalne količine, kar zagotavlja ohranitev mase, entalpije in gibalne količine. Predstavljen je testni primer, ki prikazuje ohranitev mase, entalpije in gibalne količine, na koncu pa tudi aplikacija razvitega modela za modeliranje LDN procesa.

• Language: Slovenian
• Keywords: numerično modeliranje, lagrangevo sledenje delcev, taleči se delec, sklapljanje modelov, računalniška dinamika tekočin, vrednotenje ohranjenih količin, kovinski prah, lasersko direktno nanašanje
• Work type: Bachelor thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-95518
• Publication date in RUL: 20.09.2017

Secondary language

• Language: English
• Title: Model of Powder Deposition and Melting on the Melt Pool Surface

Abstract

Numerical modelling of industrial processes is a tool of great importance as it makes development of efficient engineering solutions more economical and faster. One of currently fast developing fields is additive manufacturing, which is based on process of direct laser deposition (DLD) of metal powder. In order to derive a model of DLD process, in this work, existing finite volume Eulerian model of laser welding and cutting (main model) is extended with Lagrangian particle tracking model, which simulates depositing powder and its melting by discrete element method (melting powder model). Clad formation is achieved through mass transfer from melting powder model to main model. Both models are also coupled in enthalpy and momentum yielding mass, enthalpy and momentum balance. A test case which demonstrates conservation of mass, enthalpy and momentum is presented. Finally an application of derived model to DLD process modelling is shown.

• Keywords: numerical modelling, Lagrangian particle tracking, melting particle, model coupling, computational fluid Dynamics, assessment of conserved quantities, metal powder, direct laser deposition