Crack initiation and propagation paths in small diameter FSW 6082-T6 aluminium tubes under fatigue loading
| Autor: | D.G. Hattingh, Enrico Maggiolini, Luca Susmel, M. Neil James, Roberto Tovo |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Friction stir welding Scanning electron microscope lcsh:Mechanical engineering and machinery lcsh:TA630-695 chemistry.chemical_element 02 engineering and technology Welding Fatigue crack path law.invention Crack closure Economica Crack initiation sites Retractable tool 0203 mechanical engineering law Aluminium Microscopy lcsh:TJ1-1570 business.industry Mechanical Engineering Fracture mechanics Structural engineering lcsh:Structural engineering (General) 021001 nanoscience & nanotechnology Strength of materials 020303 mechanical engineering & transports chemistry Mechanics of Materials 0210 nano-technology business |
| Zdroj: | Frattura ed Integrità Strutturale; Vol 10 No 36 (2016): April 2016; Pages 119-129 Frattura ed Integrità Strutturale; V. 10 N. 36 (2016): April 2016; Pages 119-129 Frattura ed Integrità Strutturale, Vol 10, Iss 36 (2016) Frattura ed Integrità Strutturale, Vol 10, Iss 36, Pp 119-129 (2016) |
| ISSN: | 1971-8993 |
| Popis: | This paper reports results of fatigue tests of friction stir welded (FSW) aluminium tubes. Relatively small 38 mm diameter tubes were used and hence an automated FSW process using a retracting tool was designed for this project, as the wall thickness of the aluminium tube was similar to the diameter of the FSW tool. This is a more complex joint geometry to weld than the more usual larger diameter tube reported in the literature. S-N fatigue testing was performed using load ratios of R = 0.1 and R = -1. Crack path analysis was performed using both low magnification stereo microscopy and scanning electron microscopy, in order to identify crack initiation sites and to determine the direction of crack propagation. Work is still in progress to follow the crack path through the various microstructural zones associated with the weld. A simple statistical analysis was used to characterize the most typical crack initiation site. This work forms part of a wider project directed at determining multiaxial fatigue design rules for small diameter 6082-T6 aluminium tubes that could be of use in the ground vehicle industry. |
| Databáze: | OpenAIRE |
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