Fatigue assessment of friction stir welded DH36 steel

Toumpis, Athanasios and Galloway, Alexander and Polezhayeva, Helena and Molter, Lars; Mishra, Rajiv S. and Mahoney, Murray W. and Sato, Yakuta and Hovanski, Yuri, eds. (2015) Fatigue assessment of friction stir welded DH36 steel. In: Friction Stir Welding and Processing VIII. John Wiley & Sons, Ltd., USA, pp. 11-20. ISBN 9781119082491 (https://doi.org/10.1002/9781119093343.ch2)

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Abstract

A fatigue performance assessment of 6mm thick friction stir welded DH36 steel has been undertaken, filling a significant knowledge gap in the process for steel. A comprehensive set of experimental procedures has been proposed; the consequent study extensively examined the weld microstructure, hardness, geometry and misalignments of the samples in support of the tensile and fatigue testing. The effect of varying weld parameters was also investigated. The typical fatigue performance of friction stir welded DH36 steel plates has been established, exhibiting considerably extended fatigue lives, well above 105 cycles at a stress range of 90% of yield strength, irrespective of minor instances of small surface breaking flaws which have been identified. An understanding of the way in which these flaws impact on the fatigue performance has been developed, concluding that surface breaking defects emanating from the friction stir tool’s shoulder marks on the weld top surface can act as the dominant factor for crack initiation under fatigue loading.

ORCID iDs

Toumpis, Athanasios ORCID: https://orcid.org/0000-0003-3245-4536

Galloway, Alexander ORCID: https://orcid.org/0000-0003-0143-8314

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• Item metadata

  Item type:	Book Section
  ID code:	52793
  Dates:	Date Event 20 February 2015 Published 6 November 2014 Accepted
  Notes:	© 2015 The Minerals, Metals & Materials Society. All rights reserved.
  Subjects:	Technology > Mechanical engineering and machinery Technology > Mining engineering. Metallurgy Technology > Manufactures
  Department:	Faculty of Engineering > Mechanical and Aerospace Engineering
  Depositing user:	Pure Administrator
  Date deposited:	22 Apr 2015 08:51
  Last modified:	11 Nov 2024 15:00
  Related URLs:	Journal or Publication
  URI:	https://strathprints.strath.ac.uk/id/eprint/52793