Yield strength of [100] LiF under shock compression up to 60 GPa

TAN Ye; LI Xuemei; YU Yuying; NAN Xiaolong; GAN Yuanchao; YE Xiangping; HU Jianbo; WANG Qiannan

doi:10.11883/bzycj-2021-0242

Volume 42 Issue 4

May 2022

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Article Navigation > Explosion And Shock Waves > 2022 > 42(4): 044102

TAN Ye, LI Xuemei, YU Yuying, NAN Xiaolong, GAN Yuanchao, YE Xiangping, HU Jianbo, WANG Qiannan. Yield strength of [100] LiF under shock compression up to 60 GPa[J]. Explosion And Shock Waves, 2022, 42(4): 044102. doi: 10.11883/bzycj-2021-0242

Citation:

TAN Ye, LI Xuemei, YU Yuying, NAN Xiaolong, GAN Yuanchao, YE Xiangping, HU Jianbo, WANG Qiannan. Yield strength of [100] LiF under shock compression up to 60 GPa[J]. Explosion And Shock Waves, 2022, 42(4): 044102. doi: 10.11883/bzycj-2021-0242

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Yield strength of [100] LiF under shock compression up to 60 GPa

doi: 10.11883/bzycj-2021-0242

National Key Laboratory of Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621999, Sichuan, China

Received Date: 2021-06-21
Rev Recd Date: 2022-02-25

Available Online: 2022-04-11

Publish Date: 2022-05-09

Abstract

Abstract

The dynamic properties of metals are of importance in shock wave physics, and the time-resolved velocity profile measurement at the interface between the sample and the optical window is often used to decrease the waveform aberrations arising from free-surface reflecting and to obtain the in-situ particle velocity profile in the studied sample. In such cases, the yield strength behavior of the optical window should be taken into account for precise data processing. Among kinds of optical window materials, [100] lithium fluoride (LiF) single crystal is the most widely used window, and little work has been done for its yield strength behavior under dynamic loadings, especially planar shock. In this paper, by using the plate impact and Asay self-consistent technique for high-pressure yield strength, in-situ velocity profiles of the [100] LiF single crystal from shock-release and shock-reshock loading at different pressures were carefully measured by a displacement interferometer system for any reflector (DISAR). Then, the yield strengths under shock compression up to about 60 GPa were educed and found to markedly increase with the increasing of shock pressure, showing a notable pressure-hardening effect. Moreover, by comparing with the results from magnetically-driven isentropic loading in literatures which were the scanty public reports for the high-pressure yield strength of LiF, it was also found that the yield strengths of the [100] LiF under shock compression were higher than those obtained from isentropic loading at the same pressures. This indicates that LiF’s yield strength is more sensitive to strain rate than to temperature up to 60 GPa, and the higher strain rate under shock compression and the dominant strain rate hardening effect results in a higher yield strength. At last, the constitutive model parameters for the [100] LiF were determined to fit to our shock experiments well by using the Huang-Asay equation form. The result above shows that the [100] LiF owns an unignorable flow strength under shock pressures at least to 60 GPa. Moreover, it provides important constitutive parameters for educing the in-situ velocity profiles more accurately in experiments where LiF is used as an optical window, which is essential for researches such as flow strength, phase transition, and shock melting of metal materials.
- [100] LiF,
- yield strength,
- shock compression,
- Asay self-consistent technique

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References(26)

References

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