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Acoustoelasticity to measure residual stresses in plates of 5052 aluminum joined by FSW

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Abstract

The present work evaluates the use of acoustoelasticity techniques to measure residual stresses produced by friction stir welding (FSW) in joints of 5052 aluminum alloys after milling to develop an inspection tool for production lines. A set of experiments was adequately planned to obtain the acoustoelastic coefficient of the material, considering the welding zones. Then, the magnitude and distribution of longitudinal residual stresses throughout the perpendicular direction were obtained using an improved measurement procedure for the ultrasonic method. The technique was shown to be effective for the proposed application, as the results were validated by another residual stress measurement method. It was demonstrated that the magnitude of the stresses depends on the combination of FSW parameters, which must be selected according to the characteristics of the alloy. The results showed that lower rotational and traverse tool speed produced higher residual stress levels, indicating a significant propensity to failure that results in a decrease in welding quality.

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Acknowledgements

To Lightweight Structures Laboratory (LEL) at the Institute for Technological Research (IPT) in Brazil, especially Andre Ferrara Carunchio and Mario Batalha, for their collaboration in performing the welding. The authors acknowledge the financial support given by CAPES and the São Paulo Research Foundation, FAPESP (Fundação de Amparo à Pesquisa de São Paulo), grant number 2018/18546-3 and CNPq, grant number 315304/2018-9. Shirley Garcia is also grateful to SENESCYT (Secretaría de Educación Superior, Ciencia, Tecnología e Innovación), grant number 2015-AR2Q8297.

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Correspondence to Shirley Alexandra Garcia Ruano.

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Garcia Ruano, S.A., Delijaicov, S. & dos Santos Junior, A.A. Acoustoelasticity to measure residual stresses in plates of 5052 aluminum joined by FSW. J Braz. Soc. Mech. Sci. Eng. 45, 82 (2023). https://doi.org/10.1007/s40430-022-03998-7

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  • DOI: https://doi.org/10.1007/s40430-022-03998-7

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