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首页> 外文期刊>Journal of thermal stresses >Ultrashort pulse induced elastodynamics in polycrystalline materials. Part Ⅱ: Thermal-mechanical response
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Ultrashort pulse induced elastodynamics in polycrystalline materials. Part Ⅱ: Thermal-mechanical response

机译：多晶材料中超短脉冲引起的弹性动力学。第二部分：热力学响应

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摘要

Near-field thermal-mechanical responses in polycrystalline gold films considering grain size effects and temperature-dependent thermophysical properties are examined using the generalized thermo-elastodynamic model formulated in Part I. Ultrashort laser-induced transverse and radial thermal stress waves are attenuative, broad in bandwidth, and dispersive with extremely high frequencies. Grain size effects on thermal response are found to be so prominent that the stress fields induced in the polycrystalline film considered for the study are consistently more intense with decreasing averaged grain diameter. The normal and shear stress fields induced by a below melting threshold fluence are low in amplitude but extremely high in frequency response and power density. With the former not exceeding 20 MPa and the latter of the order of 10(18)-to-10(19) [W/m(3)] in magnitude, non-melting ultrafast heating that generates no plastic deformation is profound with the potential for initiating fatigue micro-cracking in near-field and for inflicting physical damage.
机译：考虑了晶粒尺寸效应和与温度有关的热物理性质，研究了多晶金薄膜中的近场热机械响应，使用了第一部分中制定的广义热弹动力学模型。超短激光诱导的横向和径向热应力波在整个过程中是衰减的，宽泛的。带宽，并以极高的频率分散。发现晶粒尺寸对热响应的影响是如此显着，以致于研究中考虑的多晶膜中感应出的应力场随着平均晶粒直径的减小而始终更加强烈。由低于熔化阈值通量引起的法向应力场和剪切应力场振幅低，但频率响应和功率密度极高。前者不超过20 MPa，后者不超过10（18）到10（19）[W / m（3）]的量级，因此不产生塑性变形的非熔融超快加热具有很深的意义。在近场引发疲劳微裂纹并造成物理损坏的可能性。

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