Molecular dynamics study of thermal stress and heat propagation in tungsten under thermal shock

Using molecular dynamics （MD） simulation, we study the thermal shock behavior of tungsten （W）, which has been used for the plasma facing material （PFM） of tokamaks. The thermo-elastic stress wave, corresponding to the collective displacement of atoms, is analyzed with the Lagrangian atomic stress me...

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Bibliographic Details
Published inChinese physics B Vol. 22; no. 12; pp. 376 - 382
Main Author 付宝勤 赖文生 袁悦 徐海燕 李纯 贾玉振 刘伟
Format Journal Article
LanguageEnglish
Published 01.12.2013
Subjects
Kinetic energy
Mathematical analysis
Molecular dynamics
Peak pressure
Plasma (physics)
Stress waves
Thermal shock
Tungsten
Wave propagation
傅里叶变换分析
分子动力学
应力和
弹性应力波
托卡马克等离子体
热传播
热冲击行为
钨
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ISSN1674-1056
2058-3834
1741-4199
DOI10.1088/1674-1056/22/12/126601

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Summary:Using molecular dynamics （MD） simulation, we study the thermal shock behavior of tungsten （W）, which has been used for the plasma facing material （PFM） of tokamaks. The thermo-elastic stress wave, corresponding to the collective displacement of atoms, is analyzed with the Lagrangian atomic stress method, of which the reliability is also analyzed. The stress wave velocity corresponds to the speed of sound in the material, which is not dependent on the thermal shock energy. The peak pressure of a normal stress wave increases with the increase of thermal shock energy. We analyze the temperature evolution of the thermal shock region according to the Fourier transformation. It can be seen that the “obvious” velocity of heat propagation is less than the velocity of the stress wave; further, that the thermo-elastic stress wave may contribute little to the transport of kinetic energy. The heat propagation can be described properly by the heat conduction equation. These results may be useful for understanding the process of the thermal shock of tungsten.
Bibliography:molecular dynamics simulation thermal shock thermo-elastic stress heat propagation tungsten
Fu Bao-Qin, Lai Wen-Sheng, Yuan Yue, Xu Hai-Yan, Li Chun, Jia Yu-Zhen, Liu Wei （Key Laboratory of Advanced Materials （MOE）, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China ）
11-5639/O4
Using molecular dynamics （MD） simulation, we study the thermal shock behavior of tungsten （W）, which has been used for the plasma facing material （PFM） of tokamaks. The thermo-elastic stress wave, corresponding to the collective displacement of atoms, is analyzed with the Lagrangian atomic stress method, of which the reliability is also analyzed. The stress wave velocity corresponds to the speed of sound in the material, which is not dependent on the thermal shock energy. The peak pressure of a normal stress wave increases with the increase of thermal shock energy. We analyze the temperature evolution of the thermal shock region according to the Fourier transformation. It can be seen that the “obvious” velocity of heat propagation is less than the velocity of the stress wave; further, that the thermo-elastic stress wave may contribute little to the transport of kinetic energy. The heat propagation can be described properly by the heat conduction equation. These results may be useful for understanding the process of the thermal shock of tungsten.
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ISSN:1674-1056
2058-3834
1741-4199
DOI:10.1088/1674-1056/22/12/126601