On the theoretical modeling of fatigue crack growth

Hosseini, Zahra; Dadfarnia, Mohsen; Somerday, Brian P.; Sofronis, Petros; Ritchie, Robert O.

doi:10.1016/j.jmps.2018.07.026

Cited by 68 publications

(19 citation statements)

References 56 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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“…These slip bands are the result of local plasticity on active slip systems and result in local elevations and depressions of the surface; generally termed surface extrusions and intrusions [4]. While several theoretical and computational methods have been proposed and developed to study fatigue crack initiation and growth, such as [5], [6], [15], [7]- [14], physical evidence and validation data for fatigue nucleation, initiation and growth relies upon the development of experimental techniques and observations. Recent advances in modelling, such as crystal plasticity and dislocation dynamics approaches, have afforded the opportunity to model mesoscale plasticity in considerable detail.…”

Section: Introductionmentioning

confidence: 99%

Development of fatigue testing system for in-situ observation of stainless steel 316 by HS-AFM & SEM

Payam¹,

Payton²,

Picco

et al. 2019

International Journal of Fatigue

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A miniature three-point bend fatigue stage for in-situ observation of fatigue microcrack initiation and growth behaviour by scanning electron microscopy (SEM) and contact mode high-speed atomic force microscopy (HS-AFM) has been developed. Details of this stage are provided along with finite element simulations of the stress profiles of said stage and specimen on loading. The proposed stage facilitates study of the micro mechanisms of fatigue damage evolution when used during SEM and HS-AFM scanning of the sample surface. High amplitude low cycle fatigue tests have been carried out on annealed AISI Type 316 stainless steel to demonstrate the applicability of the system. Characteristic features of surface topography and evolution of slip bands observed have been documented. Images obtained by SEM and HS-AFM are presented for comparison. Finally, to demonstrate the capability of the new facility combined with HS-AFM, the spacing between slip bands and their height at different grains at the centre of the metal sample are measured and compared.

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“…Ключовi слова: логарифмiчний декремент коливань, стрижень на двох опорах, крайова трiщина, дiагностика, вiбрацiйна дiагностика пошкоджень UDC 620.178; 620.179 DOI: 10.15587/1729-4061.2020.198451 80 % increase in damping vibrations of a reinforced concrete beam, a reinforced concrete panel, and a span of a reinforced concrete bridge when multiple cracking of concrete occurred was found in [10][11][12], respectively. A cantilever specimen with a crack at the base was tested in [13] and a rod on two supports with a crack in the middle was tested in [14]. A 2-fold increase in the characteristic of damping longitudinal vibrations was observed in both cases.…”

Section: наявнI експериментальнI дослIдження чутливостI характеристикmentioning

confidence: 99%

“…The indicated discrepancy between the data of the above experimental studies [5][6][7][8][9][10][11][12][13][14][15][16][17] is explained by the fact that the intensity of the crack-induced change in the damping characteristic depends on a series of factors. For example, it was shown in [15] that the crack parameters (size and location) are one of such factors.…”

Section: наявнI експериментальнI дослIдження чутливостI характеристикmentioning

confidence: 99%