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〈100〉LiF的低压冲击响应和1550 nm波长下的窗口速度修正
Elastic-plastic response of shocked（100） LiF and its window correction at 1550 nm wavelength
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摘要: 利用平板撞击和激光干涉测试技术对〈100〉LiF在40GPa内的冲击力学和光学特性进行了精密实验测量和理论分析.获得了该压力范围内LiF的冲击雨贡纽关系和1550 nm波长下的窗口速度修正,为相关加窗激光干涉测速实验的数据分析提供了直接依据.LiF在20.3 GPa内均表现出弹性-塑性双波特性,预计其单波响应冲击压力下限约为22—23 GPa;低于此压力时,以LiF为窗口的精密剖面测量实验需考虑其强度影响.Abstract: By using plate impact and laser interferometry technology,careful experiments and theoretical analysis for（100） LiF are carried out for its dynamic mechanical response and optical characteristics under shock pressures up to 40 GPa.The accurate shock Hugoniot relation and velocity correction at 1550 nm wavelength are then obtained.Moreover,the direct wave-profile measurments show that LiF keeps an obvious elastic-plastic response within 20.3 GPa,and the estimated lower limit pressure for single-wave shock response is about 22—23 GPa.The strength influence of LiF window on the dynamic behavior of the sample should be taken into account in precise experiments with shock pressure lower than this range.The results above establish foundations for the design and data post-processing of shock experiments in which LiF is used as an optical window for the dynamic material properties such as elasto-plasticity,phase transition and melting.
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