Effects of residual stresses on fatigue crack initiation of butt-welded plates made of high strength steel

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Abstract

The fatigue resistance of welded connections made of high strength steel is one of the challenging issues for wider use of HSS in construction. The residual stress of a V-shaped butt welds on a plate made of high strength steels are thoroughly analysed by modelling of the welding process based on subsequent thermal analysis and mechanical stress analysis by implementing kill/birth strategies. The predicted residual stresses are validated by comparing the FE results and experimental results obtain by neutron method available in the literature. A user-defined fatigue damage initiation criterion based on Smith, Watson, and Topper (SWT) parameter is implemented in ABAQUS to predict the fatigue crack initiation and life time. The residual stress effect on fatigue crack initiation of butt-welded plates is investigated by considering no effects of residuals stresses and by considering the numerically predicted residual stress distribution due to welding. The results clearly showed influence of the residual stress distribution on the fatigue crack initiation. The fatigue behaviour of butt-welded plates considering the numerically defined residual stress show better agreement with experimental results than the residual stress-free model.

Original languageEnglish
Title of host publicationAdvances in Engineering Materials, Structures and Systems
Subtitle of host publicationInnovations, Mechanics and Applications - Proceedings of the 7th International Conference on Structural Engineering, Mechanics and Computation, 2019
EditorsAlphose Zingoni
PublisherCRC Press / Balkema - Taylor & Francis Group
Pages1260-1265
Number of pages6
ISBN (Print)9781138386969
DOIs
Publication statusPublished - 2019
Event7th International Conference on Structural Engineering, Mechanics and Computation, 2019 - Cape Town, South Africa
Duration: 2 Sep 20194 Sep 2019

Conference

Conference7th International Conference on Structural Engineering, Mechanics and Computation, 2019
CountrySouth Africa
CityCape Town
Period2/09/194/09/19

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