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金属的冲击波温度测量(Ⅲ)——“基板/样品”界面间隙对辐射法测量冲击波温度的影响

DOI: 10.11858/gywlxb.1999.03.001, PP. 161-168

Keywords: 辐射法,冲击波温度,热传导率,热扩散系数,拉氏变换

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Abstract:

讨论了在利用辐射法测量金属的冲击波温度时,金属基板(靶板)与金属镀膜样品之间的间隙对“金属镀膜样品/窗口”界面上的温度的影响及其对冲击波温度测量的意义。“金属基板/间隙/镀膜样品/透明窗口”这样一种由四层介质组成的典型的靶-样品装置被广泛用于金属材料的冲击波温度测量中。利用拉普拉斯变换对上述“四层介质模型”在经受冲击波压缩作用时的热传导方程进行求解,结果表明:当冲击波扫过金属镀膜样品与窗口之间的界面(“样品/窗口”界面)后,该界面温度的弛豫过程与间隙的尺度密切相关:当间隙的厚度与镀膜层的厚度相近时,“样品/窗口”界面的台阶形温度剖面的起始部分会出现一个尖峰,尖峰的高度与宽度与间隙的尺度相关;如果金属镀膜层的厚度远大于间隙的厚度,则该温度剖面为一平顶台阶。

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