Citation: | Hou Jianhui, Liu Chong, Jing Chunyuan. Analysis of temperature rise of metal targets irradiated by CW laser[J]. Opto-Electronic Engineering, 2019, 46(12): 180659. doi: 10.12086/oee.2019.180659 |
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Overview: In order to study the interaction between CW laser and material, we analyzed the variation of peak temperature of aluminum alloy irradiated by CW laser. In this paper, the laser source which irradiated aluminum alloy material is approximated to a surface heat source. The finite element equation of temperature field of material surface irradiated by CW laser is established. The boundary conditions of material surface with radiation and heat exchange are given. When establishing the simulation analysis model of CW laser irradiated aluminum alloy circular plate, it is assumed that (i) the material is isotropic, (ii) the absorptivity and physical parameters of the material are independent of temperature, (iii) the heat loss is only the thermal radiation and convective heat transfer of the material surface to the environment, (iv) the material is opaque in the working wavelength range of the laser, and (v) there is no light penetrating material. A finite element model of the transient temperature field of aluminum alloy with a radius of 1 m and a thickness of 5 mm irradiated by CW laser was established. The effects of beam drift, spot diffusion, air convection and surface oxidation on the peak temperature of laser irradiated aluminum alloy were analyzed by simulation. The influence of latent heat of phase change on temperature rise is also analyzed by using the method of equivalent material specific heat capacity. Finally, according to the above conditions, the change of peak temperature of aluminum alloy irradiated by CW laser is given, and the damage of the material is analyzed. The simulation results show that the damage of CW laser irradiated materials is mainly due to thermal effect. Under the given simulation conditions, spot drift and spot diffusion will lead to a sharp drop in the peak temperature of the material compared with the normal situation. Surface convection has a significant effect only when the convection speed is high. The oxidation treatment on the surface of aluminum alloys will lead to a significant increase in laser absorption, and a significant reduction in the irradiation time to reach the melting temperature of the material. The latent heat of phase change has relatively little effect on the temperature rise of materials compared with other factors. From the final comprehensive analysis, when the laser reaches the material surface with an average power density of 127.33 W/cm2, the beam center drift range is twice the radius of the spot, and the surface convection velocity is 250 m/s, the peak temperature of the surface oxidized aluminum alloy reaches the melting temperature after 25 s. Under this condition, the material can be damaged.
Model of target irradiated by CW laser
Energy distribution simulation of laser heat source
Target mesh model
Temperature distribution of target after laser irradiation. (a) Temperature rise without spot drift; (b) Temperature rise under random spot drift
Peak temperature curve with spot drift
Peak temperature curve with spot diffusion
Peak temperature curve with surface air convection
Peak temperature curve
Functional image of h and equivalent specific heat capacity. (a) Functional image of h(T); (b) Functional image of equivalent specific heat capacity
Peak temperature curve with phase transition
Analysis of peak temperature change of laser-irradiated target by comprehensive factors