Very high cycle fatigue behaviour of a structural steel for offshore applications under a biaxial stress state

• Type: Article in International Scientific Journal
• Date: 2025

Authors

Dantas, R (Author) Other; Fiorentin, F (Author) Other; Correia, JAFO (Author) FEUP; Lesiuk, G (Author) Other; de Jesus, A (Author) Other

Journal

Title: International Journal of Fatigue

Vol. 199

ISSN: 0142-1123

Publisher: Elsevier

Indexing

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Other information

Authenticus ID: P-019-0AT

DOI: 10.1016/j.ijfatigue.2025.109083

Abstract (EN): The characterisation of the very high cycle fatigue (VHCF) regime has become pertinent due to the interest of extending the service life of engineering structures. However, the fatigue testing of materials at the longer lives of VHCF regime (usually greater than 10 million of cycles) is by far most efficient with an ultrasonic fatigue testing system, which introduces new challenges such as the specimen's design. As a consequence, the fatigue behaviour in the VHCF regime under the presence of stress states different from the uniaxial one is not well known. Thus, in this work, the fatigue behaviour of S690QL structural steel is analysed for the case of a biaxial stress state. A cruciform specimen was developed by finite element model analysis and, consequently, it was experimentally validated. Moreover, several specimens were tested and a mean stress-life curve estimated, considering the von Mises stresses. Additionally, the mechanism of fatigue crack initiation was assessed and the fracture surfaces were analysed.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 16