Modelling framework for 3D fatigue crack propagation in welds of offshore steel structures
Zhang, J.; Hertelé, S.; Micone, N.; De Waele, W. (2016). Modelling framework for 3D fatigue crack propagation in welds of offshore steel structures, in: Gomes, J.S. et al. (Ed.) IRF2016: 5th International conference Integrity-Reliability-Failure . pp. 751-762
In: Gomes, J.S.; Meguid, S. (Ed.) (2016). IRF2016: 5th International conference Integrity-Reliability-Failure. INEGI/FEUP: Portugal. ISBN 978-989-98832-5-3. , more
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Document type: Conference paper
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| Author keywords |
3D fatigue crack propagation; extended finite element method; weld;offshore steel |
| Abstract |
Fatigue is a common failure mechanism of welds in offshore structures. Their lifetime prediction is hampered by a large number of influence factors related to weld (e.g., residual stresses) and environment (e.g., variable amplitude loading, hydrogen embrittlement). These challenges (among others) are tackled in the Flemish research programme MaDurOS. This paper describes an extended finite element method (XFEM) based framework, developed within the scope of this programme. It allows to include weld and environment related aspects into the numerical lifetime prediction of welded structures. This paper focuses on the three-dimensional nature of crack propagation predictions. A numerical optimization and benchmark validation are discussed to illustrate the possibilities of the framework. In future work, the developed software will be coupled with residual stress in the welds and hydrogen embrittlement and be validated with experimental input/output, allowing to evaluate the ability of numerical tools for weld lifetime predictions in offshore fatigue conditions. |
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