Crack nucleation and growth modeling in biaxial fatigue

Hoshide, Toshihiko; Socie, D. F.

doi:10.1016/0013-7944(88)90018-5

Cited by 61 publications

(35 citation statements)

References 9 publications

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“…Monte Carlo numerical simulations may be used to model the growth and interaction of cracks forming at multiple defects, but involve fairly significant idealizations; this is not particularly difficult (cf. [16] for wrought alloys), just time consuming and demanding since detailed characterization of inclusion distributions is required for cast alloys. Instead, we take a simple approach which is aimed more at establishing a lower bound that could be expected for a given average porosity and mean pore size, along with extremal statistics of the spacing of the larger (fractured) Si particles and larger pores/oxides.…”

Section: Multisite Incubation Propagation and Coalescence In Lcfmentioning

confidence: 99%

Microstructure-based fatigue modeling of cast A356-T6 alloy

McDowell

Gall

Horstemeyer

et al. 2003

Engineering Fracture Mechanics

326

207

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High cycle fatigue (HCF) life in cast Al-Mg-Si alloys is particularly sensitive to the combination of microstructural inclusions and stress concentrations. Inclusions can range from large-scale shrinkage porosity with a tortuous surface profile to entrapped oxides introduced during the pour. When shrinkage porosity is controlled, the relevant microstructural initiation sites are often the larger Si particles within eutectic regions. In this paper, a HCF model is introduced which recognizes multiple inclusion severity scales for crack formation. The model addresses the role of constrained microplasticity around debonded particles or shrinkage pores in forming and growing microstructurally small fatigue cracks and is based on the cyclic crack tip displacement rather than linear elastic fracture mechanics stress intensity factor. Conditions for transitioning to long crack fatigue crack growth behavior are introduced. The model is applied to a cast A356-T6 Al alloy over a range of inclusion severities.

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Section: Multisite Incubation Propagation and Coalescence In Lcfmentioning

confidence: 99%

Microstructure-based fatigue modeling of cast A356-T6 alloy

McDowell

Gall

Horstemeyer

et al. 2003

Engineering Fracture Mechanics

326

207

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“…As far as it is known to the authors, Hoshide and Socie [32] have been the first to introduce the cyclic J-integral also to multiaxial fatigue:…”

Section: Proportional Loadingmentioning

confidence: 99%

Short crack approach for multiaxial fatigue assessment

Vormwald

Hertel²

2008

Materialwissenschaft Werkst

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A significant part of the fatigue life is spent during short crack growth. Therefore, modelling of short fatigue crack growth offers an opportunity to improve the accuracy of numerical life assessment. Besides stating some general remarks on the short crack approach itself and on multiaxial fatigue criteria, a short crack growth based fatigue life prediction approach for multiaxial non-proportional loading is presented. This approach accounts for the geometrical size effect by considering the geometry correction functions for semi-elliptical surface cracks in inhomogeneous gradient stress fields. The geometrical size effect is becoming significant for notch radii smaller than four times the defined technical crack size. Additionally, life influencing factors due to the statistical size effect have been taken into account. The comparison of calculated and experimentally observed fatigue lives of shouldered shafts made of S460N with notch radii of 0.2 to 4.0 mm under non-proportional tension and torsion loading yields a satisfying accuracy.

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“…It suggested itself to model the mechanisms by means of fracture mechanics [7][8][9][10][11][12][13][14][15][16][17][18][19]. Naturally initiating cracks require stress and strain amplitudes of a magnitude that usually prevents the application of linear elastic fracture mechanics.…”

Section: Challenge 1: Crack Driving Forcementioning

confidence: 99%

Multi-challenge aspects in fatigue due to the combined occurrence of multiaxiality, variable amplitude loading, and size effects

Vormwald¹

2015

Frattura Ed Integrità Strutturale

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ABSTRACT. The three major issues which contribute to uncertainties in fatigue life estimations are the limited transferability of material data obtained in a laboratory for describing the fatigue behavior of components, the lack of damage accumulation rules to realistically take into account the effects of various load sequences, and the uncertainty in the assessment of multiaxial stress states. The three issues contribute to life prediction errors in a balanced way. Some modeling effort was spent in joining solution proposals in a unifying short crack model. The actual state is presented in the paper together with some ideas for further improvement as well as simplification for promoting the model's acceptance in practical applications.

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Crack nucleation and growth modeling in biaxial fatigue

Cited by 61 publications

References 9 publications

Microstructure-based fatigue modeling of cast A356-T6 alloy

Microstructure-based fatigue modeling of cast A356-T6 alloy

Short crack approach for multiaxial fatigue assessment

Multi-challenge aspects in fatigue due to the combined occurrence of multiaxiality, variable amplitude loading, and size effects

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