On the mechanistic driving force for short fatigue crack path

Long, Daniel J.; Dunne, Fionn P.E.

doi:10.1016/j.jmps.2023.105368

Cited by 4 publications

(1 citation statement)

References 37 publications

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“…Indeed, in classic fatigue strength assessment methods, the focus is mainly on cracks long compared to the microstructural scale, and thus, they do not apply to small fatigue cracks 5 . Although several modeling approaches have been presented to address small crack behavior, 6–12 there is still a clear research gap in investigating the local crack driving force, clarifying the interaction with local microstructural features, and developing models that are based on the directly measured local crack driving forces, e.g., crack‐tip opening displacement (CTOD) 13 …”

Section: Introductionmentioning

confidence: 99%

Study of cyclic crack‐tip opening displacement of microstructurally small fatigue crack using digital image correlation

Tillikainen,

Gallo,

Lehto

et al. 2023

Fatigue Fract Eng Mat Struct

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The current work investigates the relationship between the crack growth rate (CGR) and the cyclic crack‐tip opening displacement (ΔCTOD) of microstructurally small fatigue cracks by using high‐resolution digital image correlation (DIC). Load‐controlled fatigue tests were conducted on small‐scale specimens of 18%Cr body‐centered cubic ferritic stainless steel. Microstructurally small fatigue crack growth was analyzed based on accurate high sample‐rate measurements, starting from a sub‐grain crack length up to seven times the volume‐weighted grain size dv = 224 μm. Under these experimental conditions, the high‐resolution analyses reveal that variation from the otherwise linear relationship between CGR and ΔCTOD on double logarithmic scale is due to the crack‐tip bypassing an inhomogeneous shear strain localization zone. In this zone, ΔCTOD is not able to characterize the behavior of microstructurally small fatigue cracks. Outside the shear strain localization zone, ΔCTOD still is a valid crack driving force parameter.

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Section: Introductionmentioning

confidence: 99%