Fatigue crack growth under overload/underload in different strength structural steels

Fatigue testing strategies for the X65 steel catenary riser with small‐scale specimens considering the effect of welding residual stress

“…Furthermore, more than 20 sets of full-size resonant bending fatigue tests were performed. In general, the reported research results indicate that the girth joint of an SCR has the worst fatigue performance of the entire flexible system, and the reduction in fatigue life is mainly attributed to microstructural inhomogeneity, [10][11][12] stress concentration, [13][14][15][16] welding residual stress, 17,18 and welding defects. 19,20 Generally, the significant microstructural inhomogeneity, higher local stress concentration coefficient, high-value welding residual stress, and the welding defect can severely reduce the fatigue life.…”

Study on the multi‐scale online fatigue crack deformation and growth behaviors under overload in Q&P steel

“…[18][19][20][21] Scholars have used DIC, especially micro-DIC to investigate the fatigue crack tip deformation and mechanics behaviors under variable amplitude loads. [22][23][24][25] Gong et al 22 investigated the fatigue retardation behavior caused by mixed I-II mode overloads using DIC and scanning electron microscope (SEM) technique. Vasco-Olmo et al 23 studied a quantitative evaluation of the fatigue crack retardation effects under single overloading in an aluminum alloy using the CJP model to calculate the effective stress intensity factor range.…”

“…Wang et al 24 studied the FCG behavior, strain evolution, and cyclic fatigue characteristics of AH36 marine steel under variable amplitude loads by the DIC method. Liang et al 25 studied the crack growth retardation/acceleration effect caused by overload/underload in the structural steels and the related mechanisms using DIC and other characterization technologies.…”

Fatigue failure modes of rib‐to‐deck joints under the multiaxial stress states caused by various wheel loading characteristics

“…The fatigue stress amplitude of all weld joints in OSBD shows typical variable-amplitude features based on simultaneous field monitoring stress histories. 17 Owing to the mutual constraints among various components, the RD weld joint is often subjected to inplane and coupled out-of-plane stress and presents complex deformation under the wheel load. 10,18 Hence, multiaxial stress states exist in the RD welded joints under the combination of stress components in different directions.…”

“…However, these methods do not consider the wheel load distribution characteristics during the bridge's actual service period. The fatigue stress amplitude of all weld joints in OSBD shows typical variable‐amplitude features based on simultaneous field monitoring stress histories 17 . Owing to the mutual constraints among various components, the RD weld joint is often subjected to in‐plane and coupled out‐of‐plane stress and presents complex deformation under the wheel load 10,18 .…”