金属冲击温度的辐射法测量问题

Hugoniot Temperature Measurements for Metals by Using Optical Radiation Method—Model Review and Discussion

金属的冲击温度及熔化温度测量对构建其完全状态方程具有重要意义。简要综述了用于金属冲击温度及熔化温度辐射法测量的一维热传导理想界面模型和非理想界面模型,并着重对模型中明示或隐含的关键假定的合理性、影响金属冲击温度与熔化温度结果的主要因素进行了分析、讨论,以期对实验数据有一个合理的评估。还讨论了求解理想和非理想界面模型一维热传导方程界面温度时所隐含的冲击压缩下热导率不随温度而变、冲击压缩下金属样品/窗口界面辐射的灰体假定,以及窗口材料的透明性、非理想界面模型中表观界面温度的修正、动载条件下金属高压熔化温度的测量、界面的非Flourier热传导等问题。分析结果表明,目前采用辐射法测量大致可以得到冲击温度,在发生熔化的情况下可获得熔化温度,但离精密测量的要求还有较大差距。

Shock temperature and melting temperature measurements are of importance to construct complete equation-of-states of materials. In this article,we overviewed the one-dimensional heat conduction model at ideal interface and model at non-ideal interface in Hugoniot temperature measurements of metals, focusing on the reasonability or tenability of the inclusive and implicative assumptions in models, and the principal factors influencing the resultant temperature. The discussed issues deal with the assumptions of the heat conductivity at shock compression independent of temperature to derive an analytical solution to the interface temperature,that of the greybody emitter of the sample/ window interface at shock compression, the transparency of window under shock temperature, the correction of apparent interface temperature to ideal interface temperature in non-ideal interface model, the measurements for melting temperature under shock compression, and the non-Flourier heat conduction at the interface. The investigations show that the metal-sample/window interfacial radiation measurements can yield an approximate Hugoniot temperature,and even an approximate melting temperature at interface pressure in the case of melting as a whole.