Volume 13 Issue 5
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Chinese Optics  > 2020  >  13(5): 1023-1031.
WEN Kang, LI He-zhang, MA Zhuang, GAO Li-hong, WANG Fu-chi, LI Wen-zhi. Effects of spot size on the temperature response of an aluminum alloy irradiated by a continuous laser[J]. Chinese Optics, 2020, 13(5): 1023-1031. doi: 10.37188/CO.2020-0022
Citation: WEN Kang, LI He-zhang, MA Zhuang, GAO Li-hong, WANG Fu-chi, LI Wen-zhi. Effects of spot size on the temperature response of an aluminum alloy irradiated by a continuous laser[J]. Chinese Optics, 2020, 13(5): 1023-1031. doi: 10.37188/CO.2020-0022
shu

Effects of spot size on the temperature response of an aluminum alloy irradiated by a continuous laser

  • School of Materials Science and Engineering, Beijing Institute of Technology, Beijing 100081, China

Funds:  Supported by National Natural Science Foundation of China (No. 52073029)
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  • Corresponding author: hstrong929@bit.edu.cn
  • Received Date: 21 Feb 2020
  • Rev Recd Date: 25 Mar 2020
    • Available Online: 10 Sep 2020
  • Publish Date: 01 Oct 2020
    Abstract
  • In order to investigate the temperature response and thermal damage of a 6061 aluminum alloy after variations in spot size of continuous laser irradiation, a three-dimensional physical model under laser irradiation was established based on ANSYS finite element software. First, we used different laser parameters to carry out laser irradiation experiments, and then, based on the collected temperature and front surface scattered light intensity data, we calculated the dynamic changes in the absorptivity of the target during laser irradiation. Finally, the optimized model was used to analyze the temperature rise characteristics of the target irradiated by lasers at different spot sizes. The research results show that the absorption rate of the material increases with an increase in temperature under 1000 W/cm2 laser irradiation. Due to the localized characteristics of laser loading, lateral thermal diffusion affects the longitudinal temperature rise, and its effect becomes smaller when the spot is larger, as related with the alloy’s thermal diffusion length. For the 6061 aluminum alloy material with a thickness of 4 mm, when the spot size is greater than 10 cm, the effect of the spot’s size is negligible, and the time threshold of fusion damage on the back surface of the target remains unchanged at 2.6 s.

     

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