High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel

Fabiano Ferreira Silva; Hermano Nascimento Junior; Roberto Rossy Chaves; Marcello Rosa Dumont

doi:10.30574/gjeta.2023.16.2.0173

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High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel

Fabiano Ferreira Silva ^{1, *}, Hermano Nascimento Junior ¹, Roberto Rossy Chaves ¹and Marcello Rosa Dumont ²

1 Materials Lab, Stellantis, Betim, Brazil.

2 Department of Materials Engineering, Federal Center for Technological Education of Minas Gerais (CEFET-MG), Belo Horizonte, Brazil.

Research Article

Global Journal of Engineering and Technology Advances, 2023, 16(02), 266–279.

Article DOI: 10.30574/gjeta.2023.16.2.0173

DOI url: https://doi.org/10.30574/gjeta.2023.16.2.0173

Publication history

Received on 14 July 2023; revised on 24 August 2023; accepted on 26 August 2023

Abstract

In this study, a methodology was successfully developed and validated to evaluate the behavior of spot welded joints of DP780, TRIP780 and DC04 steels in high cycle fatigue. Test specimens were made with three spot welds and Wohler curves were developed using the uniaxial tensile/traction load adopting the Owen R90C90 method. The spot welds showed an increase in fatigue life and a reduction in the maximum load, similar to steels. The influence of mechanical strength and material thickness tested and the types of fractures that occurred were compared. In low cycle regions, spot welds showed greater dispersion at maximum loading, between the different materials, and in higher cycle regions, this dispersion was reduced. The results obtained by adopting this method using three spot welds showed greater repeatability and less variation between the specimens of the same material. This developed method can be used with increased reliability to develop automotive bodies and spot welded components.

Keywords

Advanced High Strength Steels; Spot Welds; Fatigue; S-N Curve; Owen

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How to cite this article

Fabiano Ferreira Silva, Hermano Nascimento Junior, Roberto Rossy Chaves and Marcello Rosa Dumont. High cycle fatigue behavior of spot welds in DP 780, TRIP 780 and DC04 steel. Global Journal of Engineering and Technology Advances, 2023, 16(2), 266-279. Article DOI: https://doi.org/10.30574/gjeta.2023.16.2.0173

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