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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 105
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Paper 38

Buckling Analysis of Aluminium Alloy Structures accounting for Friction Stir Welding Effects

R.M.F. Paulo1, P. Carlone2, R.A.F. Valente1, F. Teixeira-Dias3 and G.S. Palazzo2

1GRIDS Research Group, Department of Mechanical Engineering, University of Aveiro, Portugal
2Department of Industrial Engineering, University of Salerno, Italy
3Institute for Infrastructure and Environment, School of Engineering, University of Edinburgh, United Kingdom

Full Bibliographic Reference for this paper
R.M.F. Paulo, P. Carlone, R.A.F. Valente, F. Teixeira-Dias, G.S. Palazzo, "Buckling Analysis of Aluminium Alloy Structures accounting for Friction Stir Welding Effects", in , (Editors), "Proceedings of the Ninth International Conference on Engineering Computational Technology", Civil-Comp Press, Stirlingshire, UK, Paper 38, 2014. doi:10.4203/ccp.105.38
Keywords: stiffened panel, friction stir welding, residual stresses, finite element analysis, buckling, contour method, collapse load, thermal softening, aluminium alloy 2024-T3.

The joining of aluminium alloy parts using welding techniques can be responsible for changes in the final structures such as geometrical distortions, variation of material properties and residual stresses. These effects can influence the strength of structures and must be taken into account at the design stage. The main objective of the work, described in this paper, is to assess the influence of friction stir welding processes on the load capacity of a stiffened panel subjected to longitudinal compressive loads. A numerical model, based on a finite element approach and simulating the friction stir welding process, is developed in order to evaluate these induced effects on a stiffened panel structure. Afterwards, a compressive load is applied on the structure until the collapse load is reached. The results are compared with those coming from a model not including welding simulation. It is inferred that welding effects (namely, residual stresses and material properties changes) can strongly reduce the collapse load level of the studied structure.

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