31489
20190316233243.0
10.5075/epfl-thesis-1011
doi
665886
nebis
THESIS
fre
1011
Simulation numérique des traitements de surface par laser
Lausanne
1992
EPFL
1992
180
Theses
This work deals with the numerical modeling of laser surface treatments, particularly laser remelting (a laser beam melts part of a moving work piece) and laser cladding (injection of powder in the melt pool produces a thin metallic layer on the work piece). A two-dimensional stationary model is presented for laser cladding. This model takes into account the solid-liquid phase change process and the important velocity field in the melt pool. A pure thermal problem is studied, which corresponds to a laser remelting model when the liquid particles movements are neglected. The enthalpy variable is introduced and thus the model reduces to solving the so-called stationary Stefan problem (a diffusion-convection equation, degenerated on the phase change interface). We present a Finite Element discretization for the corresponding regularized problem and give some a priori and a posteriori estimates. An efficient adaptive mesh algorithm is then presented. Finally we solve the complete laser cladding model (the two phase change and hydrodynamic problems) using a Finite Element Method and discuss some numerical results.
Picasso, Marco
106096
241282
Rappaz, Jacques
dir.
106185
241279
Texte intégral / Full text
6452297
Texte intégral / Full text
http://infoscience.epfl.ch/record/31489/files/EPFL_TH1011.pdf
ASN
252201
U10795
oai:infoscience.tind.io:31489
SB
DOI
thesis
GLOBAL_SET
DOI2
IACS
ASN
1992
1011/THESES
EPFL
PUBLISHED
THESIS