Temperature Fields on Materials Surface under High-Energy Pulse Laser Irradiation
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摘要: 以激光材料處理為背景,通過在高能脈沖激光照射下材料表面溫度變化的實驗研究,測量了在這種高能量、短脈沖、溫度變化率極大的情況下材料表面的溫升速率和溫度變化規律,并且結合實驗條件對2種不同的導熱模型進行了數值模擬.實驗結果顯示當激光脈沖寬度較大時,實驗結果和傅立葉導熱模型的計算結果很吻合,隨著激光脈沖寬度的減小,實驗結果逐漸偏離傅立葉導熱模型,而與雙曲導熱模型比較接近,同時出現了"二次升溫"等非常規現象.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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Key words:
- laser /
- surface processing pulsed heating /
- heat conduct model /
- numerical simulations
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