高能脉冲激光作用下材料表面温度场

Temperature Fields on Materials Surface under High-Energy Pulse Laser Irradiation

  • 摘要: 以激光材料处理为背景,通过在高能脉冲激光照射下材料表面温度变化的实验研究,测量了在这种高能量、短脉冲、温度变化率极大的情况下材料表面的温升速率和温度变化规律,并且结合实验条件对2种不同的导热模型进行了数值模拟.实验结果显示当激光脉冲宽度较大时,实验结果和傅立叶导热模型的计算结果很吻合,随着激光脉冲宽度的减小,实验结果逐渐偏离傅立叶导热模型,而与双曲导热模型比较接近,同时出现了"二次升温"等非常规现象.

     

    Abstract: An experimental invstigation and numerical sdrilations of temperature fields on materials surface under high-energy pulse laser irradiation were described. Through experiments the effect of temperature increasing rate and the temperature profiles on materials surface under laser irradiation were obtained, and with corresponding experimental condition some numerical simulations with two differen heat conduct models were don. By comparing the experimental results and sedation results, When pulse duration of laser is long enough, the experimenta results agree the numerical simulation results based on Fourier' Law With decreasing of pulse duration, the experimental results gradually defer from the numerical simulation results based on Fourier Heat Conduct Model, bu approach simulation results based on Hyperbolic Heat Conduct Model.When pulse duration is short enough, some unconventional phenomena appear, such as "the second heating".

     

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