| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 828390 | Materials & Design | 2015 | 9 Pages |
•Temperature dependent friction coefficient m was determined.•m varies in a limited range with varying pressure and oscillation frequency.•m value increases with temperature till about 340 °C.•Constant m = 1 is obtained for T > 340 °C indicating sticking conditions and adhesion of the interface.
In the present study, a combined experimental and numerical investigation on Linear Friction Welding (LFW) of AA2011-T3 aluminum alloy was carried out in order to find the temperature dependent shear coefficient to be used in a 3D numerical model of the process. Torque, oscillation frequency and pressure were acquired in order to calculate the shear stress at the interface. A numerical thermal model was used to calculate the temperature at the interface between the specimens starting from experimental temperatures acquired through a thermocouple embedded in the LFW specimens. Finally, the calculated shear coefficient was used to model the contact between the two specimens in a dedicated 3D, Lagrangian, thermo-mechanically coupled rigid-viscoplastic numerical model of the LFW process. A narrow range of variation of the shear factor vs temperature curve was found with varying LFW process parameters and good agreement was obtained for the temperature prediction of the 3D model of the process.
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