Modeling of laser heating of an object on the basis of optimization of grid construction with geometric object splitting

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Kavyn Ya. M. № 1 (56) 101-106 Image Image

The process of constructing a grid of a three-dimensional geometric object using default grid parameters in COMSOL Multiphysics is as follows. According to the default settings, arbitrary volume is always divided into elements using a free tetrahedral grid. Elements of the tetrahedral shape (tetrahedron) are used by default, since they can be used to divide and approximate any geometric object with arbitrarily complex topology.

It is laser radiation that is not modelled in explicit form, and it is assumed that the part of the laser radiation is not returned from the material. When using a superficial heat source, it is necessary to manually set the absorption coefficient of the material of the laser wavelength, and, accordingly, scale the region of the allocation of the beam power. In the case of partially transparent materials, the bulk of the energy of laser radiation will be allocated inside the region, and not on its surface, and any approach should be appropriately tied to the relative geometric dimensions of the objects and the wavelength.

As a result of the simulation of the project in ComsolMultiphysics, the values of the output temperatures have been obtained for all sections of the sample. Minimum, average and maximum temperatures are calculated by the program and automatically set the gradation on the graphic figure of the sample. We have also obtained the graphical results of the values of the maximum, minimum and average temperatures of the plate, depending on the time.

Taking into account the thermodynamic estimation of narrow-band excitations, one can conclude that the superficial heat source assumes that the energy of the beam is absorbed in the layer, and it is possible to neglect the small thickness of the layer in comparison with the size of the object that is heated.

Keywords: mono-structural layers, laser beam, peak temperature, temperature gra­da­tion, thermal distribution.

  • 1. Prokhorenko, C., Kashpor, K., Mykytyn, I., Mats, K., Voznyi, M., & Panas, A-Ia. (2012). Otsi­niuvannia rivnia neodnoridnosti materialu shliakhom analizu teplovoho vidhuku na vuz­ko­zonne teplove zbudzhennia: Vymiriuvalna tekhnika ta metrolohiia. (Technika Po­mia­ro­wa oraz Metrologia), 73, 41-44 (in Ukrainian).
  • 2. Metodyka vyznachennia stiikosti ta vyboru parametriv zakhystu vuzliv termichnoho na­van­ta­zhennia. (1998). Moskva (in Ukrainian).
  • 3. Baiborodina, Yu. V. (1988). Osnovy lazernoi tekhniky. Kyiv: Vydavnytstvo «Vyshcha shkola» (in Ukrainian).
  • 4. Brunner, V. (1991). Dovidnyk z lazernoi tekhniky. Moskva: Vydavnytstvo «Vyshcha shkola» (in Ukrainian).
  • 5. Maś, K., Woźny, M., Prokhorenko, S., Kashpor, K., & Szeregij, E. Sposób bezdotykowej kontroli jednorodności ochronnych powłok powierzchniowych. pat.PL P.403346 Declaration Pat.(PL) P.403346. Podano: 2013.03.28. Opub. Biuletyn UP, 20, 2014 (in Polish).