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Comparison of two contact models in the simulation of friction stir welding process

机译:摩擦搅拌焊接过程中两种接触模型的比较

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摘要

Two contact models are used to simulate the thermo-mechanical interaction process in friction stir welding. Comparison shows that the classical Coulomb friction model can be accurate enough for the simulation of friction stir welding in lower angular velocity. But in higher angular velocity, the classical Coulomb friction model fails to work due to the increase of the dynamic effect of the welding tool. Because the shear failure of material is considered in modified Coulomb friction model, the increase of the frictional stress on the tool–plate interface is limited by the shear failure. So, this model can keep valid even when the angular velocity of the welding tool is increased to a high level.
机译:使用两个接触模型来模拟搅拌摩擦焊接中的热力相互作用过程。比较表明,经典的库仑摩擦模型可以足够精确地模拟较低角速度下的搅拌摩擦焊接。但是在较高的角速度下,由于焊接工具的动态效果增加,经典的库仑摩擦模型无法正常工作。由于在修正的库仑摩擦模型中考虑了材料的剪切破坏,因此剪切破坏限制了工具板界面上的摩擦应力的增加。因此,即使将焊接工具的角速度提高到较高水平,该模型也可以保持有效。

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