Strain accumulation during microstructurally small fatigue crack propagation in bcc Fe-Cr ferritic stainless steel

Malitckii, Evgenii; Remes, Heikki; Lehto, Pauli; Yagodzinskyy, Yuriy; Bossuyt, Sven; Hänninen, Hannu

doi:10.1016/j.actamat.2017.10.038

Cited by 56 publications

(28 citation statements)

References 21 publications

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“…In recent studies of fatigue cracks as small as 10 μm in length, anomalous propagation behavior has been observed when comparisons were made with corresponding long crack behavior . Short FCG rates usually exhibit intermittent periods of both acceleration and deceleration.…”

Section: Introductionmentioning

confidence: 99%

Cracking simulation‐based fatigue life assessment

Farag

El‐Kady

Hammouda

2020

Fatigue Fract Eng Mat Struct

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A fracture mechanics numerical model is developed to simulate the collective behavior of growing short fatigue cracks originating from the surface of unnotched round specimens made of a two-phase alloy. The specimen surface roughness is considered resembling microcracks of different sizes and locations along the minimum specimen circumference. Material grains of different phases, sizes, and strengths are randomly distributed over that circumference.Variations in mechanical and microstructural features of grains are randomly distributed. Possible activities of surface cracks are predicted against loading cycles till either fracture occurs or all existing cracks become nonpropagating.The material's S-N curve and fatigue limit can, thus, be assessed. Published experimental data on ferritic-pearlitic steel specimens in push-pull constant amplitude loading (CAL) were utilized. Different specimens were randomly configured and virtually tested. Comparison of experimental results and corresponding predictions validates the model, which, further, recognizes the effect of surface roughness, specimen size, and mean stress on lives. K E Y W O R D Sendurance curve, ferritic-pearlitic steel, fracture mechanics, push-pull loading, short fatigue cracks, surface roughness

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Section: Introductionmentioning

confidence: 99%

Cracking simulation‐based fatigue life assessment

Farag

El‐Kady

Hammouda

2020

Fatigue Fract Eng Mat Struct

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“…Strain field of the linear deformations Exx and Eyy (A) and maximum (MAX) shear deformation (B) from digital image correlation during a fatigue test of the ferritic stainless steel specimen, showing strain localisation at points 1 to 5 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Micromechanics Approach To Fatigue Crack Growthmentioning

confidence: 89%

“…The shear strain accumulation measured during the fatigue test of a ferritic stainless steel specimen. The maximum shear strain calculated for the strain localisation points (1‐5) are summarised in the insert [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Micromechanics Approach To Fatigue Crack Growthmentioning

confidence: 89%

“…The recent advances in lab-based 3D X-ray tomography, together with digital volume correlation, offer an exciting new perspective to the characterisation of 3D fatigue crack growth, provided that FIGURE 13 The shear strain accumulation measured during the fatigue test of a ferritic stainless steel specimen. The maximum shear strain calculated for the strain localisation points (1)(2)(3)(4)(5) are summarised in the insert 68 [Colour figure can be viewed at wileyonlinelibrary.com]…”

Section: Discussionmentioning

confidence: 99%

“…The quantitative information will also inform and validate modelling efforts so that reliable multiscale analysis could be carried out. More recently, Malitckii et al examined strain accumulation by DIC during microstructurally small fatigue crack propagation in a polycrystalline stainless steel. They found intermittent appearance of the shear strain localisation zones ahead of the crack tip as the fatigue crack propagates (Figure ).…”

Section: Micromechanics Approach To Fatigue Crack Growthmentioning

confidence: 99%

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Full‐field characterisation of crack tip deformation and fatigue crack growth using digital image correlation—a review

Tong

2018

Fatigue Fract Eng Mat Struct

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In recent years, digital image correlation has been widely used in the analysis of crack problems. This review will examine digital image correlation, as a full‐field measurement technique, in the studies of crack tip mechanical behaviour under cyclic loading conditions. In particular, topics including determination of fracture mechanics parameters and evaluation of crack closure will be discussed. Micromechanical aspects of crack growth under cyclic loading will also be explored in crack driving and attenuation effects.

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