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Keywords
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Welded joints, variable amplitude, residual stress, mean stress correction, fracture mechanics
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Project Outline
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Most welded components are generally subjected to variable amplitude (VA) loading spectra in service. However, the fatigue design guidance given in current standards, for example, BS 7608, is largely based on experimental data obtained under constant amplitude loading. The evidence suggests that when assessing fatigue endurance of welded joints under VA loading spectra, the guidance could be either unconservative or unduly conservative depending on the nature of VA spectrum. Hence, investigations on the effect of VA loading spectra on fatigue performance of welded joints are required.
This research work aims to improve the understanding of fatigue damage in welded joints under VA loading, and to provide a tool to accurately predict fatigue endurance. The research results may be provided to BS 7608 committee for future revision of guidance with respect to fatigue damage under VA loading spectra.
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Publications
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Xu Liu, Yan-hui Zhang, Bin Wang, fatigue performance of welded joints under variable amplitude loading spectra, pressure vessel & piping (PVP) conference, 2019
Xu Liu, Yan-hui Zhang, Bin Wang, effect of mean stress on fatigue life of welded joints under variable amplitude loading, international conference on engineering structural integrity assessment (ESIA), 2019
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