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EFFECT OF CONTACT MODEL ON NUMERICAL SIMULATION OF FRICTION STIR WELDING |
大连理工大学工程力学系 |
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Cite this article:
. EFFECT OF CONTACT MODEL ON NUMERICAL SIMULATION OF FRICTION STIR WELDING. Acta Metall Sin, 2008, 44(1): 85-90 .
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Abstract Two contact models, including the classical Coulomb contact model and the modified Coulomb contact model, are used in a fully coupled thermo-mechanical numerical model of friction stir welding to study the effect of the different contact models on the simulation of friction stir welding process. Results indicate that there are little differences between the numerical results of the two contact models for friction stir welding in low rotating speed. But for the friction stir welding in high rotating speed, the classical Coulomb contact model fails to simulate the friction stir welding process due to no limit of shear stress at the interface, which is not considered to be a problem when the modified Coulomb contact model is used. The increase of the rotating speed does not change the nature of solid joining in friction stir welding. When higher rotating speed is adopted, the material deformations on the top and bottom surfaces become more similar, which lead to more uniform microstructures. So, it is recommended to adopt higher rotating speed in a real friction stir welding.
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Received: 09 May 2007
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