不同波形加载下[100]单晶铝层裂破坏的分子动力学模拟研究

杨向阳 吴楯 祝有麟 李俊国 张睿智 张建 罗国强

杨向阳, 吴楯, 祝有麟, 李俊国, 张睿智, 张建, 罗国强. 不同波形加载下[100]单晶铝层裂破坏的分子动力学模拟研究[J]. 高压物理学报, 2024, 38(3): 030106. doi: 10.11858/gywlxb.20240786
引用本文: 杨向阳, 吴楯, 祝有麟, 李俊国, 张睿智, 张建, 罗国强. 不同波形加载下[100]单晶铝层裂破坏的分子动力学模拟研究[J]. 高压物理学报, 2024, 38(3): 030106. doi: 10.11858/gywlxb.20240786
YANG Xiangyang, WU Dun, ZHU Youlin, LI Junguo, ZHANG Ruizhi, ZHANG Jian, LUO Guoqiang. Molecular Dynamics Simulation Study on Spallation Failure of [100] Single Crystal Aluminum under Different Waveform Loadings[J]. Chinese Journal of High Pressure Physics, 2024, 38(3): 030106. doi: 10.11858/gywlxb.20240786
Citation: YANG Xiangyang, WU Dun, ZHU Youlin, LI Junguo, ZHANG Ruizhi, ZHANG Jian, LUO Guoqiang. Molecular Dynamics Simulation Study on Spallation Failure of [100] Single Crystal Aluminum under Different Waveform Loadings[J]. Chinese Journal of High Pressure Physics, 2024, 38(3): 030106. doi: 10.11858/gywlxb.20240786

不同波形加载下[100]单晶铝层裂破坏的分子动力学模拟研究

doi: 10.11858/gywlxb.20240786
基金项目: 国家自然科学基金(51932006);湖北省技术创新专项重大项目(2019AFA176)
详细信息
    作者简介:

    杨向阳(2000-),男,硕士研究生,主要从事单晶层裂的分子动力学模拟研究. E-mail:331159@whut.edu.cn

    通讯作者:

    张睿智(1991-),男,博士,助理研究员,主要从事阻抗梯度飞片设计与制备技术研究.E-mail:zhangrz027@163.com

    张 建(1984-),男,博士,研究员,博士生导师,主要从事阻抗梯度飞片设计与制备技术研究.E-mail:zhangjian178@whut.edu.cn

  • 中图分类号: O347.1; O521.2

Molecular Dynamics Simulation Study on Spallation Failure of [100] Single Crystal Aluminum under Different Waveform Loadings

  • 摘要: 采用分子动力学方法模拟了[100]单晶铝在等冲量斜波和方波作用下的形变和层裂行为,分析了加载波形与层裂行为之间的相关性。研究表明,脉冲形状与热力学路径的协同作用影响了材料层裂。不同加载波形下单晶铝层裂强度的差异并非受缺陷主导的非均匀孔洞形核影响,而是由不同热力学路径下温升的差异决定。例如:当最大加载速度为3.00 km/s时,单晶铝均经历均匀层裂,但斜波加载下铝的层裂强度较方波加载时提升56.6%。斜波加载会产生逐渐增强的压缩波,使单晶铝产生相比于冲击加载更轻度的损伤。这一现象随着加载速度的提高而变得更加显著。

     

  • 图  (a)活塞法生成层裂示意图,(b) 载荷时程曲线

    Figure  1.  (a) Schematic diagram of spallation generation by piston method; (b) loading history curves

    图  层裂强度(整体法)对最大速度和脉冲形状的依赖性

    Figure  2.  Dependence of spall strength (from bulk) on the maximum velocity and pulse shape

    图  层裂强度(自由面法)对最大速度和脉冲形状的依赖性

    Figure  3.  Dependence of spall strength (from surface) on the maximum velocity and pulse shape

    图  2种方法得到的层裂强度的对比

    Figure  4.  Comparison of spall strengths obtained by two methods

    图  外加拉伸应变率与层裂温度及脉冲形状的关系

    Figure  5.  Dependency of applied tensile strain rate on spall temperature and pulse shape

    图  实验[2631]和模拟得到的层裂强度随应变率的变化

    Figure  6.  Variation of the spall strength with strain rate in experiments[2631] and this simulation

    图  层裂强度与层裂面温度的关系

    Figure  7.  Relationship between spall strength and temperature on the spall plane

    图  应力波抵达自由表面时系统的原子构型

    Figure  8.  Atomic configuration of the system when the stress wave reaches the free surface

    图  vp 为1.00和2.00 km/s时方波和斜波组中σxx的位置-时间(x-t)图

    Figure  9.  Position of σxx versus time (x-t) diagrams when vp is 1.00 and 2.00 km/s under square wave and ramp wave loading

    图  10  选定切片原子的应变率-时间曲线

    Figure  10.  Time history of strain rate for selected slice atoms

    图  11  vp 为1.25和1.50 km/s时斜波组层裂面上的缺陷结构随时间的演化

    Figure  11.  Time evolution of corresponding defect structure on the spall plane when vp is 1.25 and 1.50 km/s under ramp wave loading

    图  12  斜波和方波加载下空洞数量和损伤比的演变历程

    Figure  12.  Evolution history of void number and damage ratio under square wave and ramp wave loading

    表  1  不同工况下的层裂强度、应变速率和层裂温度

    Table  1.   Spall strength, strain rate, and spall temperature of different cases

    Group vp/(km·s−1) σsp/GPa $ \dot{\varepsilon }$/(109 s−1) Tsp/K
    From bulk From surface
    Ramp wave 1.00 9.748 8.536 1.864 223.82
    1.25 8.814 7.528 2.350 272.24
    1.50 9.847 7.851 2.983 224.95
    1.75 9.941 8.678 3.282 227.39
    2.00 10.084 8.233 3.664 230.75
    2.25 10.358 7.546 4.123 233.08
    2.50 10.321 7.077 4.556 236.06
    2.75 10.308 6.764 4.855 236.80
    3.00 10.261 6.325 5.284 239.73
    Square wave 1.00 8.180 7.725 2.287 333.47
    1.25 8.228 7.151 2.477 313.84
    1.50 9.511 8.646 2.670 291.85
    1.75 9.227 8.282 3.263 350.29
    2.00 8.689 7.578 3.611 404.72
    2.25 7.977 7.039 4.055 494.94
    2.50 7.293 6.809 4.461 561.94
    2.75 6.900 6.518 4.901 579.97
    3.00 6.551 6.135 5.312 594.51
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出版历程
  • 收稿日期:  2024-04-09
  • 修回日期:  2024-04-28
  • 网络出版日期:  2024-05-23
  • 刊出日期:  2024-06-03

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