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The role of pre-existing defects in shock-generated ejecta in copper

机译:预先存在的缺陷在铜中的冲击产生的喷射物中的作用

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摘要

The interaction of shock waves with non-planar free surfaces can cause atoms to eject from the surface,leading to the formation of ejecta. These non-planarities in the free surface can occur due to machining of the free surface or can be induced in the shock wave itself due to the presence of heterogeneities in the material. Both cases lead to the formation of ejecta. While the effect of machining on ejecta has been well studied,the latter has not been a topic of significant investigations. In this work,molecular dynamics simulations are used to systematically investigate the effect of size and concentration of He bubbles in Cu with planar free surfaces on ejecta production. It is shown that the presence of defects leads to the formation of non-planarity in the shock wave itself producing ejecta as the front reaches the flat free surface. The cluster size and velocity of ejected particles greatly exceeds that of pure Cu; the radius,density,and nature of the helium-filled voids alter the mass,velocity,and size distribution of the ejected matter.
机译:冲击波与非平面自由表面的相互作用会导致原子从表面喷射,导致喷射物的形成。由于在存在物质中存在异质性,因此可以由于机械加工而发生自由表面的这些非平坦性。两种情况都导致喷射形成。虽然在喷射物上加工的影响已经很好地研究,但后者并不是一个重大调查的主题。在这项工作中,分子动力学模拟用于系统地研究他在铜中泡沫的尺寸和浓度与平面自由表面对喷射产生的影响。结果表明,由于前沿到达平自由表面,存在缺陷的存在导致在冲击波本身中形成非平坦性。喷射颗粒的簇尺寸和速度大大超过了纯Cu;氦气空隙的半径,密度和性质改变了喷射物质的质量,速度和尺寸分布。

著录项

  • 来源
    《Journal of Applied Physics》 |2021年第7期|075101.1-075101.11|共11页
  • 作者单位

    Department of Mechanical and Aerosapce Engineering University of California San Diego 9500 Gilman Dr. La Jolla California 92093 USA;

    Department of Mechanical and Aerosapce Engineering University of California San Diego 9500 Gilman Dr. La Jolla California 92093 USA;

    Los Alamos National Laboratory Los Alamos New Mexico 87545 USA;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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