| 爆轰加载下高纯铜界面Rayleigh-Taylor不稳定性实验研究 |
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| 引用本文： | 李碧勇,彭建祥,谷岩,贺红亮.爆轰加载下高纯铜界面Rayleigh-Taylor不稳定性实验研究[J].物理学报,2020(9):191-196. |
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| 作者姓名： | 李碧勇 彭建祥 谷岩 贺红亮 |
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| 作者单位： | 南京理工大学理学院;中国工程物理研究院流体物理研究所 |
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| 基金项目： | 国家自然科学基金(批准号:11802287)资助的课题. |
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| 摘 要： | 金属界面不稳定性是内爆物理压缩过程中关注的重要问题,与传统流体界面不稳定性具有显著区别.由于相关理论和实验诊断技术的限制,目前该问题的研究还明显不足.为加深对金属界面不稳定性扰动增长行为的认识,本文建立了爆轰加载下高纯铜界面Rayleigh-Taylor不稳定性研究的实验诊断技术和数据处理方法,得到了扰动发展早期不同时刻界面扰动增长的X光图像.实验结果分析表明:在爆轰产物的无冲击加载条件下扰动波长基本保持不变,而初始扰动幅值越大,界面扰动增长的趋势就越明显;同时随着样品前界面扰动的不断发展,在样品的后自由面也出现了与前界面初始相位相反的扰动特征,即样品前界面扰动为波谷的位置所对应的后界面先运动而逐渐演变为波峰,而前界面扰动为波峰的位置所对应的后界面则演变为波谷;在5.26μs时刻,界面扰动幅值增长为初始值的700%左右,应变率达到了约105/s.结合数值模拟研究表明:在此情况下常用的Steinberg-Cochran-Guinan模型在一定程度上低估了高纯铜材料强度的强化特性,无法准确地描述强度对界面扰动增长的制稳作用,从而导致数值模拟结果要大于实验测量结果.
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| 关 键 词： | RAYLEIGH-TAYLOR不稳定性 爆轰加载 扰动增长 X光照相 |
Experimental research on Rayleigh-Taylor instability of oxygen-free high conductivity copper under explosive loading |
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| Li Bi-Yong,Peng Jian-Xiang,Gu Yan,He Hong-Liang.Experimental research on Rayleigh-Taylor instability of oxygen-free high conductivity copper under explosive loading[J].Acta Physica Sinica,2020(9):191-196. |
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| Authors: | Li Bi-Yong Peng Jian-Xiang Gu Yan He Hong-Liang |
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| Affiliation: | (School of Science,Nanjing University of Science and Technology,Nanjing 210094,China;Institute of Fluid Physics,China Academy of Engineering Physics,Mianyang 621999,China) |
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| Abstract: | The instability of metal interface is an important problem in the process of implosion physical compression,which is significantly different from the traditional fluid interface instability.Due to the limitation of related theory and experimental diagnosis technology,this problem is studied still insufficiently.In order to understand in depth the perturbation growth behavior of metal interface instability,the technique for high explosive driven Rayleigh-Taylor instability experiment on the oxygen-free high conductivity(OFHC)copper is developed.The perturbation growth on OFHC copper interface with varying initial perturbation amplitude at a specific time is recorded by radiography.According to the data processing on the X-ray images,the perturbation growth behaviors of the interface at different times are obtained.The experimental results show that the larger the initial perturbation amplitude,the faster the perturbation grows,but the perturbation wavelength of the interface remains almost unchanged at the explosive loading.The perturbation on the front interface will have an effect on the back free interface,and cause some corresponding disturbance to occur on the surface,namely,on the back free interface,the position corresponding to the perturbation trough of the front interface first moves and gradually evolves into a spike,while the position corresponding to perturbation crest evolves into a bubble.The strain rate of instability perturbation growth reaches^105/s,and the perturbation amplitude of the interface increases to about 700%of the initial value at 5.26μs.The corresponding numerical simulation results show that the normal SCG model underestimates the strength of copper and cannot well describe the stabilizing effect of material strength at this high strain rate,thereby leading to the fact that the simulation results are higher than the experimental results. |
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| Keywords: | Rayleigh-Taylor instability explosive loading perturbation growth radiography |
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