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http://dx.doi.org/10.5762/KAIS.2019.20.2.7

Development of a Coupled Eulerian-Lagrangian Finite Element Model for Dissimilar Friction Stir Welding  

Lim, Jae-Yong (Department of Safety Engineering, Seoul National University of Science and Technology)
Lee, Jinho (New Transportation Innovative Research Center, Korea Railroad Research Institute)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.20, no.2, 2019 , pp. 7-13 More about this Journal
Abstract
This study aims to develop a FE Model to simulate dissimilar friction stir welding and to address its potential for fundamental analysis and practical applications. The FE model is based on Coupled Eulerian-Lagrangian approach. Multiphysics systems are calculated using explicit time integration algorithm, and heat generations by friction and inelastic heat conversion as well as heat transfer through the bottom surface are included. Using the developed model, friction stir welding between an Al6061T6 plate and an AZ61 plate were simulated. Three simulations are carried out varying the welding parameters. The model is capable of predicting the temperature and plastic strain fields and the distribution of void. The simulation results showed that temperature was generally greater in Mg plates and that, as a rotation speed increase, not the maximum temperature of Mg plate increased, but did the temperature of Al plate. In addition, the model could predict flash defects, however, the prediction of void near the welding tool was not satisfactory. Since the model includes the complex physics closely occurring during FSW, the model possibly analyze a lot of phenomena hard to discovered by experiments. However, practical applications may be limited due to huge simulation time.
Keywords
Dissimilar Friction Stir Welding; Coupled Eulerian-Lagrangian; Finite Element Method; Temperature distribution; Plastic Strain Distribution;
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