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A numerical method to analyse the thermal phenomena involved in phase transformations at laser beam irradiation

M. PEARSICĂ1, S. BĂLUŢĂ2,* , C. CONSTANTINESCU1, C. STRÎMBU1

Affiliation

  1. ”Henri Coandă” Air Force Academy, IT and Electronic Department, 160 Mihai Viteazu St, 500183 Brasov, Romania
  2. The Military Equipment and Technology Research Agency, Aeroportului Street, No. 16, CP 19, OP Bragadiru, 077025, Ilfov, Romania

Abstract

The first part of this paper deals with the differential equations system, which governs the laser processing of materials in the presence of the O2 jet, occurring on the mobile irradiation. It deals also with the hypotheses basing the equations system obtained. Spatial and temporally distribution of temperature inside the material is governed by the full source of temperature, which has been modelled by taking into consideration the fact that the irradiation is made with a CO2 laser with a “Gaussian distribution” of photons beam’s intensity and oxidizing energy. The second part of paper deals with the determination of separation frontiers equations and graphical representations of radial distribution of the temperature of the three phases: solid, liquid and vapours. The results thus obtained allow the determining of the technological parameters of processing and the material constants..

Keywords

Laser, Thermal phenomenon, Temperature distribution.

Submitted at: Dec. 21, 2007
Accepted at: July 10, 2008

Citation

M. PEARSICĂ, S. BĂLUŢĂ, C. CONSTANTINESCU, C. STRÎMBU, A numerical method to analyse the thermal phenomena involved in phase transformations at laser beam irradiation, Journal of Optoelectronics and Advanced Materials Vol. 10, Iss. 8, pp. 2174-2180 (2008)