Research On Thermo-elastic Response Of Plate Under Intense Laser Radiation

Laser has been widely used in high technology industry and military defense. The response and mechanism of laser irradiating materials is not only the foundation of laser processing materials, but also one of the core theories of laser weapons and anti-laser reinforcement. So it is necessary to study on the thermo-elastic response of plate under intense laser radiation.Based on heat transfer and elastic theory, for thermal response and impact of plate under intense laser radiation, we primarily study on non-Fourier effect of single and multiple pulse laser irradiating plate. The main work of this paper is:(1) According to the theory of ablation and the mechanism of absorption and reflection of material, we establish the physical and mathematical model, which involves thermal radiation and ablation nonlinear problems caused by moving boundary.(2) Based on numerical heat transfer, we do the numerical simulation on the thermal response of plate under intense laser radiation. The results are:1) the heat conduction coefficient (function or constant) cause in different temperature change rate; the temperature of heating surface tends to accordance and the temperature difference of the back is relatively large with time increasing; the temperature distribution of interior is approximately the same.2) It is more suitable to utilize non-Fourier thermal conductivity to research on intense laser irradiating thin plate. Whether using single or multiple pulse laser, the temperature fields are shown obvious delay, and the delay turns stronger as slack time is increasing.(3) On the base of thermal response and small deformation hypothesis, we utilize motion equations of plate to do the numerical simulation on the thermal impart of thin plate under intense laser radiation. The results are:1) single pulse laser irradiating thin plate, non-Fourier effect is obvious, and heat bending moment gradually increases earlier then decreases.2) Multiple pulse laser irradiating thin plate, the bending moment will appear negative and gradually decrease, as the temperature difference of thin plate decreases.3) Whether using single or multiple pulse laser, the thin plate appear reverse bulge phenomenon, and the deflection change trend is decided to the change of heat bending moment.