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首页> 外文期刊>Journal of thermal stresses >Ultrashort pulse-induced elastodynamics in polycrystalline materials. Part Ⅰ: Model validation
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Ultrashort pulse-induced elastodynamics in polycrystalline materials. Part Ⅰ: Model validation

机译：多晶材料中超短脉冲诱发的弹性动力学。第一部分：模型验证

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摘要

The coupled thermal-mechanical response of a polycrystalline metallic film in response to ultrafast optical impingement is investigated. The thermo-elastodynamics formulated in the article considers laser absorption along the axial direction and thermal diffusion along the radial direction to account for the normal and shear stresses initiated by the rapid heating. The generalized formulation incorporates a two-step hyperbolic temperature model that characterizes the energy transport of electrons and lattices as finite in velocity. The coupling of thermal and mechanical fields is established through considering the energy dissipated in the form of propagating thermo-mechanical disturbances. The thermo-elastodynamical response of the polycrystalline film is found to be a strong function of the electron heat capacity that is also temperature-dependent. In addition, grain size effects due to film surface and grain-boundary scatterings are found to impact several thermophysical properties of the material. The impact of the energy transport of electrons is particularly prominent when the thickness becomes comparable with the electron mean-free-path. A staggered-grid finite difference scheme is followed to simultaneously resolve the coupled thermo-elastodynamical responses using an axisymmetric model. The time variation of the normalized electron temperature of a single crystalline gold film derived from the generalized model is favorably examined against published physical data, thus demonstrating the feasibility of the formulation in depicting the electron transport dynamics in response to non-ablating ultrafast irradiation.
机译：研究了多晶金属膜响应超快光学撞击的耦合热机械响应。文章中提出的热弹性动力学考虑了沿轴向的激光吸收和沿径向的热扩散，以说明快速加热引发的法向应力和剪切应力。广义公式结合了两步双曲线温度模型，该模型将电子和晶格的能量传输表征为速度有限。通过考虑以传播的热机械干扰形式消散的能量来建立热场与机械场的耦合。发现多晶膜的热弹性动力学响应是电子热容量的强函数，该电子热容量也是温度依赖性的。另外，发现由于膜表面和晶界散射引起的晶粒尺寸效应影响材料的几种热物理性质。当厚度变得与电子平均自由程相当时，电子能量传输的影响尤为突出。遵循交错网格有限差分方案，使用轴对称模型同时解析耦合的热弹动力响应。相对于已公布的物理数据，可以很好地检查源自广义模型的单晶金膜的归一化电子温度的时间变化，从而证明了该制剂在描绘响应于非烧蚀超快辐射的电子传输动力学方面的可行性。

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