Modele thermique instationnaire d'un traitement superficiel par une source Laser mobile

• Published in: International journal of thermal sciences 2002-11, Vol.41 (11), p.1055-1066
• Main Authors: Bessrour, J, Bouhafs, M, Khadrani, R, Jemmali, M
• Format: Article
• Language: eng ; fre
• ISSN: 1290-0729
• DOI: 10.1016/S1290-0729(02)01392-3

Numerical simulation methods permit the control of most parameters in surface heat treatment by Laser and constitute tools for treatment conditions prediction and optimisation. This paper deals with a transient numerical model which enables the simulation of all thermal history for three-dimensional space with any boundary conditions till the return to the thermal equilibrium at cooling. The problem formulation integrates a standard FEM code to solve the heat equation in non-linear transient behaviour. The numerical scheme proposed authorises the resolution with moving boundary condition in consideration of suitable space and time meshing. This model takes into account the non-linearities in relation with the variation of thermophysics properties with temperature and the loss by radiation and convection. The heat of solid phase changing is introduced as conditional source into the thermal affected zone. Compared with several contributions in this subject, this model should give a more subtle approach which gets free from classical simplifying assumptions.