A simple Eulerian thermomechanical modeling of friction stir welding
A simple Eulerian thermomechanical modeling of friction stir welding
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DOI：
10.1016/j.jmatprotec.2010.08.016
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发表时间：
2011-01-01
影响因子：
6.3
通讯作者：
Desrayaud, C.
中科院分区：
文献类型：
--
作者：
Jacquin, D.;de Meester, B.;Desrayaud, C.
提出了一种用于搅拌摩擦焊（FSW）的简单三维热机械模型。它是由Heurtier等人（2006年）提出的模型发展而来，基于流体力学数值和解析速度场的结合。这些速度场被引入到稳态热计算中，以计算焊接过程中的温度场。它们允许搅拌头肩部与工件之间发生部分滑动，滑动量作为模型的一个附加结果给出。热计算通过物质导数考虑了传导和对流效应。然后可以通过温度和应变速率等值线获取材料在加工过程中的完整热机械历程。将数值结果与在一台装有仪器的实验室设备上进行的一组实验测试案例进行了比较。根据实验结果和数值结果之间观察到的一致性或偏差，对建模假设（特别是摩擦学方面）的选择进行了讨论。滑动量似乎受到焊接条件（焊接速度和工具旋转速度）的显著影响，并对其变化提出了物理解释。（C）2010 Elsevier B.V.保留所有权利。
A simple three-dimensional thermomechanical model for friction stir welding (FSW) is presented. It is developed from the model proposed by Heurtier et al. (2006) based on a combination of fluid mechanics numerical and analytical velocity fields. Those velocity fields are introduced in a steady state thermal calculation to compute the temperature field during welding. They allow partial sliding between the shoulder and the workpiece, the amount of which is provided as an additional result of the model. The thermal calculation accounts for conduction and convection effects by means of the particular derivative. The complete thermomechanical history of the material during the process can then be accessed by temperature and strain rate contours.The numerical results are compared with a set of experimental test cases carried out on an instrumented laboratory device. The choices for modeling assumptions, especially tribological aspects, are discussed according to agreements or deviations observed between experimental and numerical results. The amount of sliding appears to be significantly influenced by the welding conditions (welding and tool rotational velocities), and physical interpretations are proposed for its evolution. (C) 2010 Elsevier B.V. All rights reserved.