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Wed, 08 January, 2020

Student Name

Xu Liu

Research Title

Fatigue performance of welded joints under variable amplitude loading spectra

Keywords

Welded joints, variable amplitude, residual stress, mean stress correction, fracture mechanics

Sponsor

TWI

Affiliated University

Brunel University London

Supervisors

Dr Yanhui Zhang (TWI Ltd.), Dr Bin Wang and Prof Luiz Wrobel (Brunel University London)

Start Date

01 Oct 2016

Project Outline

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.

Publications

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

Thesis

Fatigue performance of welded joints under variable amplitude loading spectra