2024铝合金水下搅拌摩擦焊热力耦合仿真分析  

Thermal-mechanical Coupling Simulation Analysis on Underwater Friction Stir Welding of AA2024

作　　者：王熙婷 高海涛 WANG Xi-ting;GAO Hai-tao(School of Physics,Hunan Normal University,Changsha 410000,China;Light Alloy Research Institute,Central South University,Changsha 410083,China)

机构地区：[1]湖南师范大学物理与电子科学学院,长沙410000 [2]中南大学轻合金研究院,长沙410083

出　　处：《精密成形工程》2023年第12期27-33,共7页Journal of Netshape Forming Engineering

基　　金：国家自然科学基金(51674303)。

摘　　要：目的优化搅拌摩擦焊接工艺参数,以提高接头的力学性能。方法基于ABAQUS软件建立了热力耦合有限元模型,使用耦合欧拉-拉格朗日方法对典型的航空航天用板材2024铝合金的水下搅拌摩擦焊接过程进行了仿真研究。分析了搅拌摩擦焊接过程中板材的温度场分布和材料变形情况,同时研究了前进侧和后退侧相应位置材料的流动特征,进一步讨论了搅拌头冷却速度和摩擦因数对焊接温度和材料流变场的影响。结果当摩擦因数较小时,针对焊接过程的有限元模拟将会失败;前进侧和后退侧材料变形和流动差异显著;焊接温度和等效应变随摩擦因数的增大而升高,随冷却速度的增大而降低。结论当摩擦因数为0.8时,能较好地完成焊接。相对于空冷,水冷能明显缩短高温持续时间。The work aims to optimize the friction stir welding process parameters to improve the mechanical properties of joints.Based on ABAQUS software,a thermal-mechanical coupled finite element model was established,and the underwater friction stir welding process of 2024 aluminum alloy,a typical aerospace plate,was simulated with the coupled Euler Lagrange method.The temperature field distribution and material deformation of the plate in the friction stir welding process were ana-lyzed,and the flow characteristics of the materials at the corresponding positions of the forward side and the retreating side were studied.The effects of cooling rate and friction coefficient of stirring head on welding temperature and rheological field of mate-rials were further discussed.When the friction coefficient was small,the finite element analysis of the welding process failed.There was a significant difference in material deformation and flow between the forward and retreating sides.The welding tem-perature and equivalent strain increased with the increase of friction coefficient,and decreased with the increase of cooling rate.The research results indicate that when the friction coefficient was 0.8,welding can be effectively completed.Compared to air cooling,water cooling significantly reduced the duration of high temperature.

关 键 词：水下搅拌摩擦焊 热力耦合模型 材料流变场 温度场 

分 类 号：TG146.21[一般工业技术—材料科学与工程]