搅拌摩擦焊数值分析方法概述

A Review of Numerical Analysis Method of Friction Stir Welding

数值分析方法在搅拌摩擦焊接头温度场和材料流动场研究中的应用越来越广泛。综述了在搅拌摩擦焊接头温度场和材料流动场研究中常用的计算流体力学(CFD)、任意拉格朗日-欧拉(ALE)、耦合欧拉-拉格朗日(CEL)三种数值分析模型。三种模型各有特点,计算流体力学模型(CFD)采用较早,但是该模型忽略了母材的硬化行为和从搅拌头上的剥离行为。任意拉格朗日-欧拉模型(ALE)可以避免求解过程中网格的过度扭曲,但本质上仍然是拉格朗日网格。耦合的欧拉-拉格朗日模型(CEL)采用欧拉分析对母材流动预测较为符合,但是计算花费较大。应根据研究重点进行模型的选取。指出了数值分析方法在搅拌摩擦焊研究中存在的一些普遍问题及未来发展方向。

Numerical simulation analysis has been widely used in temperature and material flow study relate to FSW process. In this paper, three numerical simulation analysis methods—— Computational Fluid Dynamics method, Arbitrary Lagrangian Eulerian method, Couple Eulerian Lagrangian method——widely used in recent years is reviewed. The three methods have their own characteristics. The CFD method was adopted earlier, but this method ignores the hardening behavior of the base metal and the peeling behavior. ALE method avoid excessive distortion of the mesh during solution, but are still essentially Lagrangian meshes. The CEL method using Euler analysis is more consistent with the prediction of base metal flow, but the calculation cost is relatively high.The researcher should select the model according to the focus.Some issues in FSW study with numerical simulation method are pointed out. Finally, the development trends of numerical simulation in FSW study were also predicted.