Local damage behaviour of friction stir-welded AA6061 /AA7075 under fatigue and static loading
(2021) ESAFORM 2021 — Location: Virtual Conference (Liège) (14.April.2021)
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- Authors
Sapanathan, Thaneshan 
- Abstract
- Friction Stir Welding (FSW) has successfully been integrated by the automotive, aerospace and space industries for welding aluminum alloys. However, in service, cyclic loading can often leads to failure of such welds. Previous studies already focused on the welding of AA6061 and AA7075 by FSW regarding microstructures, residual stresses and mechanical properties such as yield strength or ultimate tensile strength. In the present study, AA6061/AA7075 welds were analyzed to understand the impact of process parameters (rotational speed, advancing speed, axial load, ...) on different microstructures and mechanical properties. Preliminary bending tests were used to ensure the fabricated welds met a certain standard (following ISO 5173 procedures). In situ fatigue and static tensile tests equipped with lithography/Digital image Correlation (DIC) technique are proposed to understand the damage behaviours of the welds. From the DIC measurements, the critical stain and strain localization is well captured for the corresponding damaged zone. This helps understand the significant stain localization due to the presence of microstructural gradient in the welded samples. Failure seems to repeatedly occurs in the heat affected zone (HAZ) of AA6061 during the tests. These damage and failure behaviours will be investigated to understand the correlation with the local mechanical properties. These mechanical properties resulting from microstructure heterogeneities are characterized by Electron backscatter diffraction (EBSD) and Energy Dispersive X-Ray (EDX) analyses.
- Affiliations
Ecole Polytechnique, Palaiseau Laboratoire de Mécanique des Solides (LMS) Thales Global Services
Citations
Dimov, N., Sapanathan, T., Simar, A., Charkaluk, E., & Benoist, J. (2021). Local damage behaviour of friction stir-welded AA6061 /AA7075 under fatigue and static loading. ESAFORM 2021, Virtual Conference (Liège). https://hdl.handle.net/2078.5/114636