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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：超短脉冲诱导的多晶材料弹性动力学。第Ⅰ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于超快光学撞击的耦合热机械响应。制品中配制的热弹性动力学认为沿轴向和沿径向的热扩散来解释通过快速加热引发的正常和剪切应力。广义制剂包括双步双曲线温度模型，其表征电子和格子的能量传输作为速度有限。通过考虑以传播热机械扰动的形式散发的能量来建立热和机械场的耦合。发现多晶膜的热弹性动力学响应是也是温度依赖性的电子热容量的强函数。此外，发现由于薄膜表面和晶界散射引起的晶粒尺寸效应会影响材料的几种热物理性质。当厚度与自由路径相当时，电子能量传输的影响特别突出。遵循交错电网有限差分方案，同时使用轴对称模型解析耦合的热弹性动力学响应。有利地检查来自广义模型的单晶金膜的归一化电子温度的时间变化，从而针对公开的物理数据检查，从而证明了响应于非烧蚀超快照射的电子传输动力学的制剂的可行性。

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