摘要:在搅拌摩擦焊过程中，温度场和流场直接影响着晶粒大小和组织形态，而温度场又由焊接速度和搅拌头转速所影响，因而研究搅拌摩擦焊过程中搅拌速度对温度场和流场的影响具有非凡的意义。同时研究镁合金搅拌摩擦焊的热场和流场对搅拌摩擦焊过程有指导意义。23728
AZ31B搅拌摩擦焊模拟热场和流场过程，使用Gambit软件建立三文有限元模形并使用FLUENT软件进行计算。本实验采用RNG.k-e模型进行迭代，成功建立搅拌摩擦焊热场和流场的有限元模型。
通过对AZ31B镁合金板搅拌摩擦过程的温度场和流场的数值模拟，初步得到了焊接过程中焊接参数对过程中各个位置的温度和流动速度方向的影响。随着搅拌速度的加快搅拌头附近的温度升高金属的流动速度也加快。在焊接过程中焊缝两侧的温度分布并不是对称的。
毕业论文关键字：AZ31B  搅拌摩擦焊   数值模拟  温度场  流场
Abstract:In friction stir welding process, temperature and flow field directly affects the grain size and morphology, and the temperature field and affected by the welding speed and mixing head speed, which studies friction stir welding process temperature and stirring speed of flow impact of field with extraordinary significance. Meanwhile Magnesium alloy friction stir welding thermal and flow field on the friction stir welding process of guiding significance.
This paper presents an analysis of the use of numerical simulation of AZ31B magnesium alloy friction stir welding method. The focus of the project is the temperature and flow field AZ31B magnesium alloy plate. Tool speed is determined experimentally determined parameters within the range of influence of friction stir welding temperature field and flow field plate of magnesium. In this paper, the thermal and flow field simulation process using Fluent software, using Gambit software for three-dimensional modeling and finite element model of the formation of iterative model using RNG.k-e establish FSW thermal and flow field of finite element model.
By temperature and flow field numerical simulation of AZ31B magnesium alloy plate friction stir process, the initial impact was welding process of welding parameters on the temperature and flow velocity in the direction of the course of each location. With the acceleration of the stirring speed of the mixing head elevated temperature near the metal flow rate has accelerated. Weld temperature during welding on both sides of the distribution is not symmetric.
Keywords: AZ31B    Friction stir welding    Temperature field  Numerical Simulation    Flow field
目录
目录    4
1. 绪论    6
1.1镁及镁合金焊接性分析    6
1.1.1镁及镁合金    6
1.1.2镁及镁合金的特点    6
1.1.3镁合金的焊接特点    6
1.1.4AZ31镁合金特点    7
1.2搅拌摩擦焊方法及其应用    7
1.2.1 搅拌摩擦焊原理    7
1.2.2 搅拌摩擦焊的优缺点    8
1.2.3搅拌摩擦焊的发展概况    9
1.2.4搅拌摩擦焊的研究概况    9
1.3数值模拟软件的选择    10
1.3.1GAMBIT    10
1.3.2 FLUENT软件    10
1.4 本课题研究内容    10
2. AZ31镁合金搅拌摩擦焊有限元模型建立    11
2.1AZ31镁合金搅拌摩擦焊三文模型建立    11
2.1.1搅拌头三文模型的建立    11
2.1.2镁合金板模型    12
2.1.3 网格划分    13
2.1.4边界条件的设定    13
2.2主控方程    14 FLUENT镁合金搅拌摩擦焊焊缝金属塑性流动形态数值模拟:http://www.youerw.com/cailiao/lunwen_16928.html