Numerical simulation of plasma dynamics in laser shock processing experiments
Numerical simulation of plasma dynamics in laser shock processing experiments
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DOI：
10.1016/j.apsusc.2008.09.067
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发表时间：
2009-03-01
影响因子：
6.7
通讯作者：
Ocana, J. L.
中科院分区：
文献类型：
--
作者：
Morales, M.;Porro, J. A.;Ocana, J. L.
激光冲击处理(LSP)是基于在金属靶材和周围介质(透明锥体)之间的界面上应用高强度脉冲激光束(1 GW/cm(2)；tau<；50 ns)。Ning材料，通常是水)迫使金属表面突然汽化成高温高密度的等离子体，并立即产生冲击波，传播到材料中。冲击波在靶材料中引起塑性变形和残余应力分布。激光冲击处理被认为是提高金属材料疲劳、腐蚀开裂和耐磨性的一种有竞争力的替代技术。由于相互作用过程中出现的非线性效应，相关的激光吸收现象的描述变得几乎不复杂，并显著改变了冲击动力学。作者开发了一个耦合方式处理LSP模拟的主要方面的模拟模型(SHOCKLAS)。本文利用HELIOS(一维辐射-流体动力学拉格朗日流体动力学程序)对约束层与基材之间等离子体膨胀产生的流体动力学现象进行了模拟。该程序用于研究激光冲击条件下的等离子体动力学。骗局的影响。研究了宁层(介质和厚度)对等离子体压力的影响。(C)2008爱思唯尔B.V.保留所有权利。
Laser shock processing (LSP) is based on the application of a high intensity pulsed laser beam (I > 1 GW/cm(2); tau < 50 ns) at the interface between the metallic target and the surrounding medium (a transparent con. ning material, normally water) forcing a sudden vaporization of the metallic surface into a high temperature and density plasma that immediately develops inducing a shock wave propagating into the material. The shock wave induces plastic deformation and a residual stress distribution in the target material.Laser shock processing is being considered as a competitive alternative technology to classical treatments for improving fatigue, corrosion cracking and wear resistance of metallic materials.The description of the relevant laser absorption phenomena becomes hardly complicated because of the non-linear effects appearing along the interaction process and which significantly alter the shocking dynamics.A simulation model (SHOCKLAS), dealing with the main aspects of LSP modelling in a coupled way, has been developed by the authors. In this paper the study will be centred on the simulation of the hydrodynamic phenomenology arising from plasma expansion between the confinement layer and the base material using HELIOS (1-D radiation-hydrodynamics lagrangean fluiddynamic code).This code is used to study plasma dynamics under laser shock processing conditions. The influence of the con. ning layer (medium and thickness) on plasma pressure is also studied. (C) 2008 Elsevier B.V. All rights reserved.