Revealing the mechanism of critical root radius in notch fatigue limit based on crack closure concept

Li, Bochuan; Jiang, Chao; Noguchi, Hiroshi; Liu, Long

doi:10.1016/j.ijfatigue.2019.105261

Cited by 6 publications

(2 citation statements)

References 24 publications

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“…The possible reason is that we create a much shaper pre-crack (10 nm) using FIB compared with previous researches. A blunt notch with large root radius can absorb a lot of energy before crack initiation, which results in an improperly high value of 𝐾𝐾 𝐼𝐼𝑐𝑐 [28,29]. However, 𝐾𝐾 𝐼𝐼𝑐𝑐 is unable to describe the extrinsic toughening mechanisms that take place during crack propagation [25].…”

Section: Bending Testmentioning

confidence: 99%

Investigation of failure mechanisms of nacre at macro and nano scales

Liu

Yang

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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Section: Bending Testmentioning

confidence: 99%

Investigation of failure mechanisms of nacre at macro and nano scales

Liu

Yang

et al. 2020

Journal of the Mechanical Behavior of Biomedical Materials

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“…Li et al [16] carried out a study on the influence of different surface crack directions on the change in stress intensity factor during bearing operation. Yaagoubi and Meier [17] studied the relationship between surface cracks with different angles and the J-integral, and they showed that the increase in friction effect in the case of oblique cracks weakened the J-integral at the crack tip. But there has been no in-depth study on penetrating cracks, which are more harmful to the structure; these will be studied in this paper for HPS steel.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Fatigue Crack Propagation Behaviour of 550E High-Performance Steel

Xiao,

Lin,

Wang

et al. 2023

Metals

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The fatigue crack propagation behaviour of Q550E high-performance steel (HPS) is studied in this paper. Static tensile testing and fatigue crack propagation testing were carried out, and the results were compared with those of Q235. Finite element models were developed and verified against the experimental results. The impacts of the initial crack angle, crack depth ratio, stress ratio, thickness, and corrosion pitting on the fatigue crack propagation behaviour of the HPS were analysed. The results show that the fatigue life of Q550 was reduced by 18% due to the corrosion pitting, but it did not change the crack propagation path. When the stress intensity factor is higher than a certain value, the fatigue performance of Q235 is better than that of Q550E. The initial crack angle of 52.5° is the critical angle of the crack stress intensity factor. The steel tends to fracture as the crack depth ratio increases, and more attention should be paid to the effective crack length in engineering practice. An increasing stress ratio leads to a smaller stress intensity factor, and the thickness affects the stress intensity factor in the later stage. The crack stress intensity factor around the corrosion pits gradually decreases along the thickness direction, and the crack tips around the corrosion pits tend to reach the yield state initially, accelerating the fatigue fracture of the specimen and ultimately leading to a decrease in fatigue life.

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Notch size influence on fatigue limit of steels pertinent to grain size

Yang

Zhang

2022

International Journal of Fatigue

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Revealing the mechanism of critical root radius in notch fatigue limit based on crack closure concept

Cited by 6 publications

References 24 publications

Investigation of failure mechanisms of nacre at macro and nano scales

Investigation of failure mechanisms of nacre at macro and nano scales

Numerical Investigation of Fatigue Crack Propagation Behaviour of 550E High-Performance Steel

Notch size influence on fatigue limit of steels pertinent to grain size

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