Fatigue crack growth rates under sequential mixed‐mode I and II loading cycles

Wong, S. L.; Bold, P. E.; Brown, M. W.; Allen, Robert L.

doi:10.1046/j.1460-2695.2000.00342.x

Cited by 39 publications

(26 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Equation 2 appears to underestimate the measured crack growth rates by a factor of 3 to 5.5. A similar synergetic effect was reported in Wong et al (1996Wong et al ( , 2000 and Doquet and Pommier (2004) for rail steel.…”

Section: Observationssupporting

confidence: 81%

“…Does the loading path have an intrinsic influence, or can all this influence be captured through appropriate corrections for closure and friction effects on stress intensity factors, that is, by the use of K effective I , K effective II , K effective III ? This problem is complex and no clear answer emerges from the literature on non-proportional mixedmode I and II (Gao et al 1983;Hourlier et al 1985;Wong et al 1996Wong et al , 2000Planck and Kuhn 1999;Yu and Abel 2000;Doquet and Pommier 2004) or mode I and III (Feng et al 2006). The latter concludes: "with identical loading magnitudes in the axial and torsional directions, the crack growth and crack profiles are strongly dependent on the loading path.…”

mentioning

confidence: 96%

See 1 more Smart Citation

Influence of the loading path on fatigue crack growth under mixed-mode loading

et al. 2009

View full text Add to dashboard Cite

International audienceFatigue crack growth testswere performed under various mixed-mode loading paths, on maraging steel. The effective loading paths were computed by finite element simulations, in which asperity-induced crack closure and friction were modelled. Application of fatigue criteria for tension or shear-dominated failure after elastic–plastic computations of stresses and strains, ahead of the crack tip, yielded predictions of the crack paths, assuming that the crack would propagate in the direction which maximises its growth rate. This approach appears successful in most cases considered herein

show abstract

Section: Observationssupporting

confidence: 81%

mentioning

confidence: 96%

Influence of the loading path on fatigue crack growth under mixed-mode loading

et al. 2009

View full text Add to dashboard Cite

show abstract

“…The relative deviation (ΔK) and the load ratio (R) can be used in a 18 wide range of models for prediction of crack growth rates, da/dN. These include the models first postulated by Paris et al [30] but also a number of more advanced damage accumulation type models [31][32][33][34].…”

Section: Figurementioning

confidence: 99%

A coupled approach for rolling contact fatigue cracks in the hydrodynamic lubrication regime: The importance of fluid/solid interactions

Balcombe

Fowell

Olver

et al. 2011

Wear

View full text Add to dashboard Cite

This article presents a novel approach for modelling rolling contact fatigue cracks in the presence of lubricants. The proposed formulation captures the interaction between fluid pressure and solid deflections both at the contact interface and along the crack faces using a fully coupled finite volume/boundary element solver. This enables shedding light on the mechanisms which govern crack propagation in various loading conditions and geometrical configurations. It is shown that by linking the fluid behaviour and the elastic deflections within the crack to the film formed at the contact interface it is possible to overcome one of the main limitations of classical models available in the literature, which consists in having to prescribe pressure and/or pressure gradient at the crack mouth during the each loading cycle. The application of linear elastic fracture mechanics principles for the determination of crack stress intensity factors suggests that the results obtained using the approach developed by the authors produce a more realistic characterisation of the crack tip behaviour and it is capable of producing an improved estimate of crack propagation rates. Implications of these findings for the development of rolling contact fatigue lifing tools and potential extensions of the technique are also discussed.

show abstract

“…A natural evolution for this model should be to extend it to mixed mode loading conditions. Many authors [11][12][13][14][15][16][17][18] have researched this open problem, and all agree that plasticity induced history effects in mixed mode conditions modify both the growth direction and the growth rate of a fatigue crack.…”

Section: Modellingmentioning

confidence: 99%

“…This is commonly known as plasticity-induced crack closure [3]. These history effects are also present under variable amplitude mixed mode loading conditions [12][13][14][15][16][17][18][19][20][21][22].…”

Section: Introductionmentioning

confidence: 99%

History effect in fatigue crack growth under mixed-mode loading conditions

Decreuse¹,

Pommier²,

Gentot³

et al. 2009

International Journal of Fatigue

View full text Add to dashboard Cite

Plastic deformation within the crack tip region introduces internal stresses that modify subsequent behaviour of the crack and are at the origin of history effects in fatigue crack growth.Consequently, fatigue crack growth models should include plasticity induced history effects. A model was developed and validated for mode I fatigue crack growth under variable amplitude loading conditions. The purpose of this study was to extend this model to mixed mode loading conditions. Finite element analyses are commonly employed to model crack tip plasticity and were shown to give very satisfactory results. However, if millions of cycles need to be modelled to predict the fatigue behaviour of an industrial component, the finite element method becomes computationally too expensive. By employing a multiscale approach, the local results of FE computations can be brought to the global scale. This approach consists of partitioning the velocity field at the crack tip into plastic and elastic parts. Each part is partitioned into mode I and mode II components, and finally each component is the product of a reference spatial field and an intensity factor. The intensity factor of the mode I and mode II plastic parts of the velocity fields, denoted by dρ I /dt and dρ II /dt, allow measuring mixed-mode plasticity in the crack tip region at the global scale.Evolutions of dρ I /dt and dρ II /dt, generated using the FE method for various loading histories, enable the identification of an empirical cyclic elastic-plastic constitutive model for the crack tip region at the global scale. Once identified, this empirical model can be employed, with no need of additional FE computations, resulting in faster computations. With the additional hypothesis that the fatigue crack growth rate and direction can be determined from mixed mode crack tip plasticity (dρ I /dt and dρ II /dt), it becomes possible to predict fatigue crack growth under I/II mixed mode and variable amplitude loading conditions. To compare the predictions of this model with experiments, an asymmetric four point bend test system was set-up. It allows applying any mixed mode loading case from a pure mode I condition to a pure mode II. Initial experimental results showed an increase of the mode I fatigue crack growth rate after the application of a set of mode II overload cycles.

show abstract

Fatigue crack growth rates under sequential mixed‐mode I and II loading cycles

Cited by 39 publications

References 16 publications

Influence of the loading path on fatigue crack growth under mixed-mode loading

Influence of the loading path on fatigue crack growth under mixed-mode loading

A coupled approach for rolling contact fatigue cracks in the hydrodynamic lubrication regime: The importance of fluid/solid interactions

History effect in fatigue crack growth under mixed-mode loading conditions

Contact Info

Product

Resources

About