Fatigue Performance and Strength Assessment of AA2024 Alloy Friction Stir Lap Welds
| Autor: | Hong-Tae Kang, Ruijie Wang, Xinghai Lei |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Mechanical Engineering Alloy Stress–strain curve chemistry.chemical_element 02 engineering and technology Welding engineering.material 021001 nanoscience & nanotechnology 01 natural sciences Finite element method law.invention Cross section (physics) chemistry Mechanics of Materials Aluminium law 0103 physical sciences Vickers hardness test engineering Fracture (geology) General Materials Science Composite material 0210 nano-technology |
| Zdroj: | Journal of Materials Engineering and Performance. 29:6701-6713 |
| ISSN: | 1544-1024 1059-9495 |
| Popis: | This work experimentally studied the weld-seam cross section characteristics and the fatigue performance of AA2024 aluminum alloy friction stir linear welded joints. The Vickers hardness values on the cross section of the weld-seam have a tendency of being lower than those of the upper sheet, whereas in the lower sheet there is a significant downward profile across the nugget, like a “V” shape. The grains in the welded nugget are finer than those of the base material. Within low-cycle regime, the fracture always occurred at the hook vertex on the loading-carrying upper sheet, while on the loading-carrying lower sheet within relatively high-cycle regime. The typical SEM fractographs of the upper and lower sheets are observed and compared accordingly. The fatigue lives of these specimens were assessed by fictitious notch radius approach and two local damage equations, Morrow’s modified Manson–Coffin damage equation and the Smith–Watson–Topper damage equation, combined with stress and strain at the weld-seam periphery obtained from finite element analyses. Results showed that both the Morrow’s modified Manson–Coffin damage equation and fictitious notch radius approach can give more reasonable results. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink