On characterisation of local stress–strain properties in friction stir welded aluminium AA 5083 sheets using micro-tensile specimen testing and instrumented indentation technique
✍ Scribed by D. Rao; J. Heerens; G. Alves Pinheiro; J.F. dos Santos; N. Huber
- Publisher
- Elsevier Science
- Year
- 2010
- Tongue
- English
- Weight
- 1016 KB
- Volume
- 527
- Category
- Article
- ISSN
- 0921-5093
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✦ Synopsis
Stress-strain property variations in welded joints are frequently characterized by determining local stress-strain curves across the joint. A commonly and widely accepted method is testing of micro-tensile specimens where the specimens have to be mechanically extracted form the joint and subsequently tested and analysed similar to that of a conventional tensile tests. A recently developed procedure for the determination of local stress-strain properties is based on instrumented indentation testing where the force-depth curves are analysed via artificial neural networks in order to derive local stress-strain curves. In order to verify this new method on welded joints, this method has been applied to a friction stir weld in 3 mm thick aluminium AA 5083 sheet material. It turned out that the local stress-strain curves derived by instrumented indentation tests and neural networks are compatible with that obtained from micro-tensile testing. Further on, the article gives advises on a proper tests specimen preparation as well as on the treatment of possible residual stresses.