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以TC4钛合金为研究对象,利用计算流体力学软件FLUENT建立搅拌摩擦焊过程的三维有限体积模型,选取k-ε湍流计算模型,利用数值模拟的方法对材料的塑性流动行为进行了研究。结果表明:搅拌头及其附近区域的材料流动方向与搅拌头的旋转方向相同,且此区域的材料流动速度远大于其它区域;受接触点线速度的影响,轴肩附近的材料流动速度大于焊件内部与搅拌针接触区域材料的流动速度,且搅拌针附近材料的流动速度随搅拌针的直径减小而减小。
Taking TC4 titanium alloy as the research object, a three-dimensional finite volume model of the friction stir welding process was established by computational fluid dynamics software FLUENT. The k-ε turbulence model was selected and the plastic flow behavior of the material was studied by numerical simulation. The results show that the direction of material flow in the head and its vicinity is the same as that of the head, and the material flow velocity in this region is much larger than that in other regions. Due to the linear speed of the contact point, the material flow velocity near the shoulder is greater than that of the welding The material flow velocity in the interior of the part in contact with the pin and the flow rate of the material in the vicinity of the pin decreases as the pin diameter decreases.