Elucidation of fatigue characteristics and fracture mechanism of friction stir spot‐welded tension–shear joint steels

The fatigue life and fracture mechanism of friction stir spot welded tension–shear joints using 590‐MPa class steel as a base material under constant‐amplitude conditions were investigated with focus on welding dimension variations caused by tool wear. The fatigue limit of the friction stir spot wel...

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Bibliographic Details
Published in:Fatigue & fracture of engineering materials & structures 2021-01, Vol.44 (1), p.74-84
Main Authors: Selvaraj, Thomasprabhu, Ishida, Shogo, Arakawa, Jinta, Akebono, Hiroyuki, Sugeta, Atsushi, Aoki, Yasuhiro, Fujii, Hidetoshi
Format: Article
Language:English
Subjects:
Base metal
Crack propagation
Diameters
fatigue
Fatigue failure
Fatigue life
Fatigue limit
Fatigue strength
Fracture mechanics
fracture mechanism
Friction
friction stir spot welding
Friction stir welding
High strength steels
Metal fatigue
Morphology
Spot welding
Tensile strength
tension–shear joint
Tool wear
Welded joints
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Summary:The fatigue life and fracture mechanism of friction stir spot welded tension–shear joints using 590‐MPa class steel as a base material under constant‐amplitude conditions were investigated with focus on welding dimension variations caused by tool wear. The fatigue limit of the friction stir spot welding (FSSW) joint used for this study is significantly low compared with the static tensile strength of the joint itself. It was clarified that the FSSW joint in this study exhibited two different failure morphologies regardless of the applied load level: base metal fracture and weld area fracture. Although the welding state changes due to the tool wear phenomenon that produce two types of fracture modes in relation to the welding rip diameter, they have no effect on the fatigue strength, regardless of the applied load.
ISSN:8756-758X
1460-2695
DOI:10.1111/ffe.13332