A Coupled Rigid-viscoplastic Numerical Modeling for Evaluating Effects of Shoulder Geometry on Friction Stir-welded Aluminum Alloys

Authors

1 Departamento de Ingeniería mecánica, Grupo IMTEF, Universidad Autónoma del Caribe, Barranquilla, Colombia

2 Departamento de Ingeniería mecánica, Grupo ICT, Universidad de Córdoba, Montería, Colombia

Abstract

Shoulder geometry of tool plays an important role in friction-stir welding because it controls thermal interactions and heat generation. This work is proposed and developed a coupled rigid-viscoplastic numerical modeling based on computational fluid dynamics and finite element calculations aiming to understand these interactions. Model solves mass conservation, momentum, and energy equations in three dimensions, using appropriate boundary conditions, considering mass flow as a non-Newtonian, incompressible, viscoplastic material. Boundary conditions of heat transfer and material flow were determined using a sticking/sliding contact condition at tool / workpiece interface. Thermal history, as well as shear stress and rotational speed fields, forces and torque values for three shoulder geometry conditions were calculated. Numerical results of thermal history, torque and forces during welding showed good correlation with experimentally measured data.

Keywords

References

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International Journal of Engineering
Volume 32, Issue 2
TRANSACTIONS B: Applications
February 2019
Pages 313-321

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