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Numerical simulation of three-dimensional heat transfer and plastic flow during friction stir welding

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Abstract

Three-dimensional visco-plastic flow of metals and the temperature fields in friction stir welding have been modeled based on the previous work on thermomechanical processing of metals. The equations of conservation of mass, momentum, and energy were solved in three dimensions using spatially variable thermophysical properties and non-Newtonian viscosity. The framework for the numerical solution of fluid flow and heat transfer was adapted from decades of previous work in fusion welding. Non-Newtonian viscosity for the metal flow was calculated considering strain rate, temperature, and temperature-dependent material properties. The computed profiles of strain rate and viscosity were examined in light of the existing literature on thermomechanical processing. The heat and mass flow during welding was found to be strongly three-dimensional. Significant asymmetry of heat and mass flow, which increased with welding speed and rotational speed, was observed. Convective transport of heat was an important mechanism of heat transfer near the tool surface. The numerically simulated temperature fields, cooling rates, and the geometry of the thermomechanically affected zone agreed well with independently determined experimental values.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, The Pennsylvania State University, 16802, University Park, PA, U.S.A.

    R. Nandan (Graduate Student), G. G. Roy (Visiting Scientist) & T. Debroy (Professor)

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  1. R. Nandan
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  2. G. G. Roy
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  3. T. Debroy
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Nandan, R., Roy, G.G. & Debroy, T. Numerical simulation of three-dimensional heat transfer and plastic flow during friction stir welding. Metall Mater Trans A 37, 1247–1259 (2006). https://doi.org/10.1007/s11661-006-1076-9

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  • DOI: https://doi.org/10.1007/s11661-006-1076-9

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