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Numerical studies of tool diameter on strain rates, temperature rises and grain sizes in friction stir welding

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Abstract

Fully coupled thermo-mechanical model is used to obtain the true strain components. The sizes of the TMAZ and the SZ are predicted according to the different behaviors of the traced material particles. The strain rate and the temperature histories are used to calculate the Zener-Hollomon parameter and then the grain size in the SZ. Results indicate that the contribution from the temperatures is much more important than the one from the deformations. The strain rates at the advancing side are higher than the ones at the retreating side on the top surface but become symmetrical on the bottom surface. The widths of the TMAZ and the SZ become narrower in smaller shoulder diameter. Smaller shoulder can lead to smaller grain size in the SZ.

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Authors and Affiliations

  1. Department of Engineering Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Faculty of Vehicle Engineering and Mechanics, Dalian University of Technology, Dalian, 116024, China

    Zhao Zhang & Qi Wu

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  1. Zhao Zhang
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  2. Qi Wu
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Correspondence to Zhao Zhang.

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Recommended by Editor Chongdu Cho

Zhao Zhang, Ph.D., is a professor in Department of Engineering Mechanics at Dalian University of Technology. He received his doctoral degree from Dalian University of technology in 2007. He is a member of International Association of Computational Mechanics and serves as reviewers for about 20 international journals. His scientific research is focused on numerical simulation of friction stir welding, safety design of locomotive, and fracture mechanics. He published about 30 SCI indexed articles with about 320 citations.

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Zhang, Z., Wu, Q. Numerical studies of tool diameter on strain rates, temperature rises and grain sizes in friction stir welding. J Mech Sci Technol 29, 4121–4128 (2015). https://doi.org/10.1007/s12206-015-0906-3

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  • DOI: https://doi.org/10.1007/s12206-015-0906-3

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