Modeling friction stir welding process of aluminum alloys |
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Authors: | J -H Cho S H Kang H N Han K H Oh |
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Affiliation: | (1) Korea Institute of Materials Science, 66, Sangnam-dong, Changwon-si, 641-010 Gyeongnam, Korea;(2) School of Material Science and Engineering, Seoul National University, San 56-1, Sillim-dong, Gwanak-gu, 151-744 Seoul, Korea |
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Abstract: | The friction stir welding (FSW) process of aluminum alloys has been modeled using a two-dimensional Eulerian formulation.
Velocity field and temperature distribution are strongly coupled and solved together using a standard finite element scheme.
A scalar state variable for hardening is also integrated using a streamline integration method along streamlines. A viscoplastic
constitutive equation to consider plastic flow and strength variations was implemented for the process modeling. Precipitates
inside AA6061 alloys are sensitive to elevated temperatures and affect strength evolution with temperature. The overall effects
of the precipitate variations with temperature on strength were reflected using temperature-dependent material parameters.
The material parameters of constitutive equations were obtained from isothermal compression tests of various temperatures
and strain rates. The effects of FSW process conditions on heating and hardening were investigated mainly near the tool pin.
The microhardness distribution of the weld zone was compared with the prediction of strength. In addition, crystallographic
texture evolutions were also predicted and compared with the experimental results. |
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Keywords: | friction stir welding finite element aluminum alloys hardness crystallographic texture |
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