Fatigue modeling and numerical analysis of re-filling probe hole of friction stir spot welded joints in aluminum alloys

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Yousefi, A, Serjouei, A ORCID: https://orcid.org/0000-0002-7250-4131, Hedayati, R and Bodaghi, M ORCID: https://orcid.org/0000-0002-0707-944X, 2021. Fatigue modeling and numerical analysis of re-filling probe hole of friction stir spot welded joints in aluminum alloys. Materials, 14 (9): 2171. ISSN 1996-1944

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Official URL: https://doi.org/10.3390/ma14092171

Abstract

In the present study, the fatigue behavior and tensile strength of A6061-T4 aluminum alloy, joined by friction stir spot welding (FSSW), are numerically investigated. The 3D finite element model (FEM) is used to analyze the FSSW joint by means of Abaqus software. The tensile strength is determined for FSSW joints with both a probe hole and a refilled probe hole. In order to calculate the fatigue life of FSSW joints, the hysteresis loop is first determined, and then the plastic strain amplitude is calculated. Finally, by using the Coffin-Manson equation, fatigue life is predicted. The results were verified against available experimental data from other literature, and a good agreement was observed between the FEM results and experimental data. The results showed that the joint’s tensile strength without a probe hole (refilled hole) is higher than the joint with a probe hole. Therefore, re-filling the probe hole is an effective method for structures jointed by FSSW subjected to a static load. The fatigue strength of the joint with a re-filled probe hole was nearly the same as the structure with a probe hole at low applied loads. Additionally, at a high applied load, the fatigue strength of joints with a refilled probe hole was slightly lower than the joint with a probe hole.

Item Type:	Journal article
Publication Title:	Materials
Creators:	Yousefi, A., Serjouei, A., Hedayati, R. and Bodaghi, M.
Publisher:	MDPI
Date:	23 April 2021
Volume:	14
Number:	9
ISSN:	1996-1944
Identifiers:	Number Type 10.3390/ma14092171 DOI 1435199 Other
Rights:	© 2021 by the authors. Licensee MDPI, Basel, Switzerland. This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Divisions:	Schools > School of Science and Technology
Record created by:	Jonathan Gallacher
Date Added:	04 May 2021 15:01
Last Modified:	31 May 2021 15:03
URI:	https://irep.ntu.ac.uk/id/eprint/42807