摘要
【目的】旨在研究搅拌摩擦焊(Friction stir welding,FSW)过程中材料的流动行为,了解FSW过程的机理。【方法】采用ABAQUS软件,基于光滑粒子流体动力学(Smoothed particle hydrodynamics,SPH)方法建立AZ31B镁合金的搅拌摩擦焊数值模型,通过对特征粒子的追踪,研究材料流动的趋势。【结果】结果表明,材料流动在焊接前进方向的位移比其他2个方向大,并且前进侧要比后退侧大,后退侧相对于前进侧的材料流动性能较弱;材料围绕着搅拌头运动,从前进侧流向后退侧,越靠近搅拌头部分的粒子变形和位移越大,后退侧粒子沿着搅拌头轴向螺旋上升,最后停留在后退侧,并在搅拌头的后侧中混合。【结论】预测了搅拌摩擦焊过程中飞边和空腔缺陷的产生;动能和内能比值验证了模型的可行性。
[Objective]The aims is to study flow behavior of material in friction stir welding(FSW)process and understand mechanism of FSW process.[Methods]By ABAQUS software,numerical model of friction stir welding of AZ31B magnesium alloy is established based on smoothed particle hydrodynamics(SPH)method,and trend of material flow is studied by tracking characteristic particles.[Results]The results show that displacement of material flow in the forward direction of welding is larger than that of the other two directions,advancing side is larger than retreating side,and material flow performance of retreating side is weaker than that of advancing side.Material moves around stirring head,flowing from advancing side to retreating side.Deformation and displacement of particles closer to stirring head part are greater.Particles on the retreating side spiral up along the axis of stirring head,and finally stay on the retreating side and mix in the rear side of stirring head.[Conclusion]Generation of flash and cavity defects in the FSW process is predicted.Ratio of kinetic energy and internal energy verifies feasibility of the model.
作者
韩泽平
曹丽杰
HAN Zeping;CAO Lijie(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)
出处
《焊接》
2025年第9期70-75,103,共7页
Welding & Joining
