A practical expression for evaluating the small shear-mode fatigue crack threshold in bearing steel

Okazaki, Saburo; Matsunaga, Hisao; Ueda, Tohru; Komata, Hiroki; Endo, Mitsuru

doi:10.1016/j.tafmec.2014.07.016

Cited by 31 publications

(3 citation statements)

References 55 publications

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“…Therefore, the SIFs were calculated separately here for Mode I and II cracks at the edge of the semi‐elliptic flat areas. The stress intensity (

∆ K_{I - italicFA}

、

∆ K_{italicII - italicFA}

) for Mode I and II cracks at the edge of the semi‐elliptic flat areas can be calculated by using the following equations 27,32

normalΔ K_{I - italicFA} goodbreak= 0.65 normalΔ σ_{FA} \sqrt{π \sqrt{{italicArea}_{italicFA}}}

normalΔ K_{italicII - italicFA} goodbreak= 0.69 normalΔ τ_{FA} \sqrt{π \sqrt{{italicArea}_{italicFA}}}

…”

Section: Discussionmentioning

confidence: 99%

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Effect of microstructure and local stress on small crack initiation and propagation paths in coarse‐grained FeCrAl alloys

Zhan,

Liu,

Dai

et al. 2023

Fatigue Fract Eng Mat Struct

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This study investigated the high cycle fatigue crack initiation and propagation behaviors in coarse‐grained FeCrAl alloys, with a focus on the relationship between the path of small cracks and the local microstructure. The results show that the small cracks initiate along the {100} slip plane due to the synthetical influence of local microstructure and shear stress. The initiation zone forms inclined areas with layered fine‐grain areas caused by cyclic shear stress. Quantitative analysis of the stress intensity factor (SIF) indicates that in the realm of mixed‐mode loading, the SIF of Mode I takes the lead in determining the intensity of stress and strain fields at the crack tip. As the crack propagates further, the SIF steadily increases. Once it reaches a specific threshold, the propagation mode within a coarse grain shifts from Mode II to Mode I. Moreover, fatigue life increases with a tendency for decreased SIF during crack deflection.

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“…Therefore, the SIFs were calculated separately here for Mode I and II cracks at the edge of the semi‐elliptic flat areas. The stress intensity (

∆ K_{I - italicFA}

、

∆ K_{italicII - italicFA}

) for Mode I and II cracks at the edge of the semi‐elliptic flat areas can be calculated by using the following equations 27,32

normalΔ K_{I - italicFA} goodbreak= 0.65 normalΔ σ_{FA} \sqrt{π \sqrt{{italicArea}_{italicFA}}}

normalΔ K_{italicII - italicFA} goodbreak= 0.69 normalΔ τ_{FA} \sqrt{π \sqrt{{italicArea}_{italicFA}}}

…”

Section: Discussionmentioning

confidence: 99%

“…The stress intensity (ΔK IÀFA 、ΔK IIÀFA ) for Mode I and II cracks at the edge of the semi-elliptic flat areas can be calculated by using the following equations. 27,32…”

Section: A Change In the Mode Of Small Crack From Initiation To Propa...mentioning

confidence: 99%

Effect of microstructure and local stress on small crack initiation and propagation paths in coarse‐grained FeCrAl alloys

Zhan,

Liu,

Dai

et al. 2023

Fatigue Fract Eng Mat Struct

View full text Add to dashboard Cite

show abstract

“…Therefore, special consideration of the crack size effect is required in order to quantify fatigue strength. [26][27][28][29] Peters et al [2][3][4] introduced an FOD crater onto a Ti-6Al-4V alloy specimen with an impact velocity of 300 m/s, later performing fatigue tests at a stress ratio of 0.1. They combined residual stress, stress concentration and microcracks according to the Kitagawa-Takahashi approach.…”

Section: Discussionmentioning

confidence: 99%

Effect of impact velocity and impact angle on residual stress fields caused by foreign object damage

Matsunaga

2020

Strain

Self Cite

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In order to study the residual stress induced by foreign object damage (FOD), the distribution of residual stress caused by the impact of a hard spherical body was measured via the sin2ψ technique, using synchrotron X‐ray. A steel sphere was impacted onto a flat surface of a Ti‐6Al‐4V alloy from an angle of either 90° or 45°, at a velocity of 180 m/s. The same sphere was also quasi‐statically pressed into the surface. In the cases of right‐angled impact and quasi‐static indentation, a compressive residual stress was extensively distributed inside the generated crater. No remarkable difference in residual stress distribution was noted between the dynamic case and the quasi‐static case. However, at an impact angle of 45°, a tensile residual stress that is more detrimental to fatigue strength was widely distributed inside the crater. Outside of the craters, tensile stress was generally observed in all cases.

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A New Fatigue Testing Machine for Investigating the Behavior of Small Shear-Mode Fatigue Cracks

et al. 2016

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A practical expression for evaluating the small shear-mode fatigue crack threshold in bearing steel

Cited by 31 publications

References 55 publications

Effect of microstructure and local stress on small crack initiation and propagation paths in coarse‐grained FeCrAl alloys

Effect of microstructure and local stress on small crack initiation and propagation paths in coarse‐grained FeCrAl alloys

Effect of impact velocity and impact angle on residual stress fields caused by foreign object damage

A New Fatigue Testing Machine for Investigating the Behavior of Small Shear-Mode Fatigue Cracks

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