分子动力学研究高应变率对单晶铜空洞成核和生长过程的影响
Molecular Dynamics Study of High Strain Rate of Single Crystal Copper Cavity Nucleation and Growth Process
DOI: 10.12677/JAPC.2018.72013, PDF,    科研立项经费支持
作者: 刘 芸, 赵 倩, 林光会, 雷洁红*：西华师范大学物理与空间科学学院，四川 南充
关键词: 空洞形核和生长；分子动力学；高应变率；Void Nucleation and Growth； Molecular Dynamics； High Strain Rate
摘要: 利用分子动力学模拟研究了高应变率下单晶Cu空洞生长和聚集的损伤演化。计算单晶Cu在1.5 km/s和2.0 km/s时飞片速度的自由表面速度。当v0分别为1.5 km/s和2.0 km/s时，应变率分别为1.39 × 109 s−1和1.52 × 109 s−1。介绍了失效过程中的微观空间演变，并计算了相应的空隙分布和空隙体积分数。结果解释了高应变率下单晶Cu损伤演化的机制。另外，分析了应变率对空隙形核和生长的影响。这些结果为飞秒激光下金属层裂的实验研究提供了理论基础。
Abstract: The femtosecond laser can achieve high strain rates. We have investigated the damage evolution by void growth and coalescence of single crystal Cu at high strain rates using molecular dynamics simulation. The free surface velocities of single crystal Cu for the flyer velocity at 1.5 km/s and 2.0 km/s are calculated. The strain rates are 1.39 × 109 s−1 and 1.52 × 109 s−1 respectively when v0 are 1.5 km/s and 2.0 km/s. The microvoid evolution during the failure is presented, and the corresponding void distribution and void volume fraction are calculated. The results explain that the mechanism of damage evolution of single crystal Cu at high strain rates. In addition, the effect of strain rates on void nucleation and growth is analyzed. The results provided a theoretical basis for the experimental study of metal spallation under the femtosecond laser.
文章引用：刘芸, 赵倩, 林光会, 雷洁红. 分子动力学研究高应变率对单晶铜空洞成核和生长过程的影响[J]. 物理化学进展, 2018, 7(2): 104-110. https://doi.org/10.12677/JAPC.2018.72013

参考文献

[1] Xu, X.F., Cheng, C.R. and Chowdhury, I.H. (2004) Molecular Dynamics Study of Phase Change Mechanisms during Femtosecond Laser Ablation. Journal of Heat Transfer, 126, 727-734. [Google Scholar] [CrossRef] 
[2] Perez, D. and Lewis, L.J. (2002) Ablation of Solids under Femtosecond Laser Pulses. Physical Review Letters, 89, 255504-255507. [Google Scholar] [CrossRef] 
[3] Luo, S.-N., Germann, T.C. and Tonks, D.L. (2010) Anisotropic Shock Re-sponse of Columnar Nanocrystalline Cu. Journal of Applied Physics, 107, 1-7. [Google Scholar] [CrossRef] 
[4] Luscher, D.J., Bronkhorst, C.A., Alleman, C.N. and Addessio, F.L. (2013) A Model for Finite-Deformation Nonlinear Thermomechanical Re-sponse of Single Crystal Copper under Shock Conditions. Journal of the Mechanics and Physics of Solids, 61, 1877-1894.
[5] Lin, E.Q., Shi, H.J. and Niu, L.S. (2014) Effects of Orientation and Vacancy Defects on the Shock Hugoniot Behavior and Spallation of Single-Crystal Copper. Modelling and Simulation in Materials Science and Engineering, 22, 121-129. [Google Scholar] [CrossRef] 
[6] Luo, S.-N., An, Q., Germann, T.C. and Han, L.-B. (2009) Shock-Induced Spall in Solid and Liquid Cu at Extreme strain Rates. Journal of Applied Physics, 106, 253-768. [Google Scholar] [CrossRef] 
[7] Chau, R., Stölken, J., Asoka-Kumar, P., Kumar, M. and Holmes, N.C. (2010) Shock Hugoniot of Single Crystal Copper. Journal of Applied Physics, 107, 5067-2071. [Google Scholar] [CrossRef] 
[8] Zhao, K.J., Chen, C.Q., Shen, Y.P. and Lu, T.J. (2009) Molecular Dynamics Study on the Nano-Void Growth in Face-Centered Cubic Single Crystal Copper. Computational Materials Science, 46, 749-754. [Google Scholar] [CrossRef] 
[9] He, A.M., Duan, S.Q., Shao, J.-L., Wang, P. and Qin, C.S. (2012) Shock Melting of Single Crystal Copper with a Nanovoid: Molecular Dynamics Simulations. Journal of Applied Physics, 112, 247. [Google Scholar] [CrossRef] 
[10] Evans, R., Badger, A.D., et al. (1996) Time- and Space-Resolved Optical Probing of Femtosecond-Laser-Driven Shock Waves in Aluminum. Physical Review Letters, 77, 3359-3362.
[11] Funk, D.J., Moore, D.S., McGrane, S.D., et al. (2004) Ultrafast Studies of Shock Waves Using Interferometric Methods and Transient Infrared Absorption Spectroscopy. Thin Solid Films, 453-454, 542-549.
[12] Huang, L., Yang, Y.Q., et al. (2009) Measurement of Transit Time for Femtosecond-Laser-Driven Shock Wave through Aluminium Films by Ultrafast Microscopy. Journal of Physics D: Applied Physics, 42, 045502-045508.
[13] Cuq-Lelandais, J. P., Boustie, M., Berthe, L., et al. (2009) Spallation Generated by Femtosecond Laser Driven Shocks in Thin Metallic Targets. Journal of Physics D: Applied Physics, 42, 065402-065402.
[14] Shao, J.-L., Wang, P., He, A.-M., Duan, S.-Q. and Qin, C.-S. (2013) Molecular Dynamics Study on the Failure Modes of Aluminium under Decaying Shock Loading. Journal of Applied Physics, 113, 349-356. [Google Scholar] [CrossRef] 
[15] Xiang, M.Z., Hu, H.B., Chen, J. and Long, Y. (2013) Molecular Dynamics Simulations of Micro-Spallation of Single Crystal Lead. Modelling and Simulation in Materials Science and Engineering, 21, 055005-055010. [Google Scholar] [CrossRef] 
[16] Rawat, S., Warrier, M., Chaturvedi, S. and Chavan, V.M. (2012) Effect of Material Damage on the Spallation Threshold of Single Crystal Copper: A Molecular Dynamics Study. Modelling and Simulation in Materials Science and Engineering, 20, 386-386. [Google Scholar] [CrossRef] 
[17] Brommer, P. and Mousseau, N. (2012) Comment on “Mechanism of Void Nucleation and Growth in bcc Fe: Atomistic Simulations at Experimental Time Scales”. Physical Review Letters, 108, 125501-125508. [Google Scholar] [CrossRef] 
[18] 雷洁红, 谷渝秋. 冲击波加载下单晶铜动态破坏微观过程的分子动力学研究[J]. 原子能科学技术, 2016, 50(5): 769-773.