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利用传统AC法测量材料的动屈服强度,高压下组合飞片容易分离,实验不容易成功。对于铝合金,现有最大实验压力是Huang和Asay等人完成的22 GPa。以高阻抗的TC4材料为飞片,在样品前加装低阻抗的PMMA缓冲层,利用冲击波在缓冲层中的多次反射实现对样品的再加载,在58.9 GPa的高压下得到了理想的弹-塑性双波结构的再加载波剖面。利用近似的双台阶样品确定样品中的拉格朗日纵波声速,利用卸载塑性声速外延的方法确定体波声速,得到58.9 GPa下2A12铝合金的τo-τc为0.61 GPa。利用卸载实验数据插值的方法得到该压力下的τo+τc为1.08 GPA。综合分析得到该压力下的动屈服强度为1.69 GPa。
Using the traditional AC method to measure the dynamic yield strength of the material, the combination flyer can be easily separated under high pressure, and the experiment is not easy to be succeeded. For aluminum alloys, the maximum experimental pressure available is 22 GPa by Huang and Asay et al. High-impedance TC4 material was used as a flyer, and a low-resistance PMMA buffer layer was added before the sample to reload the sample by using multiple reflections of the shock wave in the buffer layer. An ideal bullet was obtained under a high pressure of 58.9 GPa - Reinforced double wave structure reloaded wave profile. The approximate two-step sample was used to determine the velocity of the Lange Longitudinal wave in the sample. The bulk acoustic velocity was determined by the unloading method of the plastic velocity-acoustic-epitaxy. The τo-τc of the 2A12 aluminum alloy at 58.9 GPa was 0.61 GPa. Using the unloading experimental data interpolation method to obtain the pressure τo + τc 1.08 GPA. The comprehensive analysis shows that the yield strength under this pressure is 1.69 GPa.