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      저자 : Utpal Nath (검색결과 1 건)
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        Analytical modelling of 3D temperature evolution of Al 6061-T6 irradiated by a moving laser heat source considering intensive convective boundary conditions

        Utpal Nath,Vinod Yadav 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.12

        The estimation of temperature evolution in a solid material irradiated by a highintensity laser beam is important for modelling of various laser-based heating processes. This paper proposes a three-dimensional analytical solution of temperature field based on the integral transform technique considering intensive convective boundary conditions. The proposed model evaluates the temperature of a laser-heated sheet as a function of geometric, material and laser attributes of the sheet. By comparing the findings of experimental investigation performed on 1.5 mm thick Al 6061-T6 sheets under the considered process conditions, the effectiveness of the proposed model is evaluated. Laser power and scanning speed varied during the experiments keeping laser beam radius and specimen geometry constant. The surface temperature of the laser-heated sheet is found to rise with increasing laser power. In contrast, the surface temperature drops with high scan speeds. The analytical and experimental results are in close agreement with errors less than 3 %. Eventually, the temperature evolution predicted by the analytical solution is compared numerically and it is found that the analytical model can effectively reduce the computing time for evaluating the temperature in the laser heating process. To broaden the application of the analytical model, the effect of process parameters, namely, laser beam radius, workpiece thickness and material properties on the temperature evolution are analyzed under different cooling schemes. This investigation is of significance towards developing an inverse method for determining laser process parameters quickly and inexpensively for various laser-based heating processes in near future works.

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