PSI - Issue 42

Mihai A. Popescu et al. / Procedia Structural Integrity 42 (2022) 1626–1633 M.A. Popescu et al. / Structural Integrity Procedia 00 (2022) 000–000

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support structure. The high residual stress values combined with high hardness values and potential defects in the weld area show that the residual stress can have a large impact on fatigue strength, crack initiation and crack propagation. If left unaccounted in the design phase or untreated post-welding, high residual stresses can lead to a shorter lifespan of wind turbine support structures, especially when taking into consideration the increase in tower height, which in turn increases the loads and probability of undetected defects.

Acknowledgements

This work was financed by Programa Operacional Regional do NORTE, Operation NORTE-08-5369-FSE-000046, co-funded by the European Social Fund (FSE) through NORTE 2020, the Institute of Mechanical Engineering and Industrial Management (INEGI) and the Faculty of Engineering at the University of Porto (FEUP).

References

Albuquerque, C.M.C., Miranda, R.M.C., Richter-Trummer, V., de Figueiredo, M.A.V., Calc¸ada, R. and de Castro, P.M.S.T. (2012), ”Fa tigue crack propagation behaviour in thick steel weldments”, International Journal of Structural Integrity, Vol. 3 No. 2, pp. 184-203. https: // doi.org / 10.1108 / 17579861211235192 Anais Jacob, Jeferson Oliveira, Ali Mehmanparast, Foroogh Hosseinzadeh, Joe Kelleher, Filippo Berto, Residual stress mea surements in o ff shore wind monopile weldments using neutron di ff raction technique and contour method, Theoretical and Applied Fracture Mechanics, Volume 96, 2018, Pages 418-427, ISSN 0167-8442, https: // doi.org / 10.1016 / j.tafmec.2018.06.001. (https: // www.sciencedirect.com / science / article / pii / S0167844218300454) Baumgartner, Jo¨rg. 2016. “Enhancement of the Fatigue Strength Assessment of Welded Components by Consideration of Mean and Residual Stresses in the Crack Initiation and Propagation Phases.” Welding in the World 60 (3): 547–58. doi:10.1007 / s40194-016-0304-1. Dieter Radaj, 1992, Heat E ff ects of Welding: Temperature Field, Residual Stress, Distortion, Springer-Verlag, ISBN-13: 978-3-642-48642-5, DOI: 10.1007 / 978-3-642-48640-1. Erich Hau, 2006. Wind Turbines: Fundamentals, Technologies, Application, Economics. 10.1007 / 3-540-29284-5. Klas Weman, 2012, Welding Processes Handbook (Second Edition), Woodhead Publishing, ISBN 9780857095107, https: // doi.org / 10.1533 / 9780857095183.19. (https: // www.sciencedirect.com / science / article / pii / B9780857095107500033) Lawrence, F V, J D Burk, and J-Y. Yung. 1982. “Influence of Residual Stress on the Predicted Fatigue Life of Weldments.” In Residual Stress E ff ects in Fatigue, STP 776:33–43. Nelson, D V. 1982. “E ff ect of Residual Stress on Fatigue Crack Propagation.” In Residual Stress E ff ects in Fatigue. Vol. STP 776. Panagiotis (Pan) Michaleris, 2014 . Minimization of Welding Distortions. In: Hetnarski, R.B. (eds) Encyclopedia of Thermal Stresses. Springer, Dordrecht. https: // doi.org / 10.1007 / 978-94-007-2739-7 449 Prime, M. B. and DeWald, A.T., “The Contour Method,” Chapter 5 in Practical Residual Stress Measurement Methods, G. S. Schajer, (ed.), Wiley-Blackwell, 2013, pp. 109-138