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Residual stress evaluation in friction stir-welded aluminum plates using finite element method and acoustic emission

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Abstract

Acoustic Emission (AE) method proposed in this paper as a novel approach was used to evaluate residual stress in friction stir welding (FSW) of 5086 aluminum plates. A finite element method was used to evaluate residual stresses in aluminum plates caused by FSW, which was validated by the hole-drilling process. Moreover, fundamental antisymmetric Lamb wave mode (A 0) was implemented to measure the residual stresses produced by FSW process. The novelty of this investigation is the combination of a robust signal-processing analysis and theory of acoustoelastic Lamb wave. In this analysis, an envelope of A 0 mode is used instead of signal time of flight, which obliterates the need to utilize a synchronizing clock of receiving sensors. It was shown that the duration of the signal changes linearly with residual stress variation, and a new equation was then established. Finally, it is confirmed that AE as a nondestructive approach can be an efficient tool for residual stress measurement in welded plate.

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Acknowledgements

The authors wish to thank the Department of Mechanical Engineering at Amirkabir University of Technology, Tehran, the Islamic Republic of Iran, for providing the facilities for this study.

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The author(s) received no financial support for the research, authorship, and/or publication of this article.

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Authors and Affiliations

  1. Mechanical Engineering Department, Amirkabir University of Technology, 424 Hafez Ave., Tehran, 15875-4413, Iran

    Ali Mahdian Ahi, Jalal Yousefi, Mehdi Ahmadi Najafabadi & Amir Esmaeilzare

  2. Department of Mechanical Engineering, Shahid Rajaee Teacher Training University, Lavizan, Tehran, 1678815811, Iran

    Amir Refahi Oskouei

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  1. Ali Mahdian Ahi
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  2. Jalal Yousefi
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  3. Mehdi Ahmadi Najafabadi
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  4. Amir Esmaeilzare
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Correspondence to Jalal Yousefi.

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Ahi, A.M., Yousefi, J., Najafabadi, M.A. et al. Residual stress evaluation in friction stir-welded aluminum plates using finite element method and acoustic emission. J Mater Sci 52, 2103–2116 (2017). https://doi.org/10.1007/s10853-016-0498-z

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  • DOI: https://doi.org/10.1007/s10853-016-0498-z

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