Fatigue Crack Initiation Life Analysis of Butt-Welded joints Considering Welding Deformation

DOI

10.2991/iceep-18.2018.179How to use a DOI?

Keywords

butt-welded joints, welding deformation, fatigue-initiation-life, stress concentration factor, fatigue notch factor

Abstract

In this paper, fatigue tests of butt-welded joints, under four-point bending cyclic load, were conducted to investigate the influence of welding deformation on fatigue crack initiation life. It is found that the distribution of residual stress around the weld toe is changed depending on the welding deformation. Meanwhile, welding deformation has an effect on stress concentration factor in the corner. So FEM was used to obtain the stress concentration factor of butt joints considering the welding deformation. A modified Neuber method was adapted to predict fatigue crack initiation life. Moreover, the fatigue notch factor was defined and on which the influence of mean stress and residual stress were considered. Finally, the evaluated results with the modified formula and the test results were compared. It is showed that welding deformation in the corner has an important influence on fatigue crack initiation life. The effect of welding deformation cannot be neglected in the life estimation.

Copyright

© 2018, the Authors. Published by Atlantis Press.

Open Access

This is an open access article distributed under the CC BY-NC license (http://creativecommons.org/licenses/by-nc/4.0/).

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TY  - CONF
AU  - Yu Feng
AU  - He Feng
AU  - Qin Kai
PY  - 2018/09
DA  - 2018/09
TI  - Fatigue Crack Initiation Life Analysis of Butt-Welded joints Considering Welding Deformation
BT  - Proceedings of the 2018 7th International Conference on Energy and Environmental Protection (ICEEP 2018)
PB  - Atlantis Press
SP  - 1021
EP  - 1028
SN  - 2352-5401
UR  - https://doi.org/10.2991/iceep-18.2018.179
DO  - 10.2991/iceep-18.2018.179
ID  - Feng2018/09
ER  -