摘要
以轴肩端面为同心圆的带螺纹搅拌头为研究对象,利用计算流体力学软件FLUENT建立了三维塑性材料流动模型,对2024铝合金搅拌摩擦焊接过程中材料的塑性流动进行了数值模拟,研究焊接工艺参数对模拟结果的影响。结果表明,在搅拌头附近区域材料的塑性流动剧烈,且轴肩附近材料的流动速度高于搅拌针边缘材料的流动速度;随着搅拌头旋转速度的增加,搅拌头附近区域材料流动更剧烈,且高速流动的材料区域范围变大;焊接速度的提高对搅拌头及其附近区域材料的流动影响不大。
The numerical simulation of 3D flow field in friction stir welding of 2024 Al alloy was researched by adopting CFD software FLUENT,while the shape of rotational tool shoulder was concentric-circles-flute.The effects of welding parameters on the flow behavior of plastic material were obtained.The results show that the material flows strongly near the rotational tool.Moreover,the material flow velocity near the shoulder is higher than that which is near the pin.With the increase of the rotational tool＇s speed,the material flow velocity increases and the region which material flow strongly enlarges.The effect of welding speed on the material flow is not obvious.
出处
《热加工工艺》
CSCD
北大核心
2012年第11期152-154,共3页
Hot Working Technology
关键词
搅拌摩擦焊
材料流动
数值模拟
焊接参数
friction stir welding
material flow
numerical simulation
welding parameters
