Mixed mode II and III fatigue crack growth in a rail steel

Bonniot, Thomas; Doquet, Véronique; Hai, Si

doi:10.1016/j.ijfatigue.2018.01.010

Cited by 36 publications

(22 citation statements)

References 40 publications

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“…In previous studies, Paris equations for fatigue crack growth in mode I [5] and in-phase mode II + III [6] in the same rail steel have been determined as, respectively: A slightly better correlation of the measured crack growth rates can also be obtained with:…”

Section: Crack Growth Ratesmentioning

confidence: 99%

“…In previous studies, Mode I crack growth kinetics in R260 rail steel were determined, for positive and negative R ratios [5], as well as friction-corrected crack growth kinetics for fully-reversed in-phase mode II and III [5,6]. However, neither pure mode I alone, nor combined mode II + III loadings alone could explain the crack paths and growth rates observed in rails.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue crack growth under non-proportional mixed-mode I + II. Role of compression while shearing

Bonniot

Doquet

Hai

2020

International Journal of Fatigue

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Mode I + II fatigue crack growth tests are run, following sequential or pseudo-sequential loading paths, representative of those computed for "squat type" cracks in rails. Stereo DIC provides the near-tip displacements, from which ∆K ef f ective I and ∆K ef f ective II are derived. Compression while shearing extends coplanar growth, by slowing down the wear-induced rise of the effective mode mixity ratio, up to the critical value for which bifurcation occurs. The consideration of plasticity and contact and friction stresses improves crack paths predictions, compared to the maximum tangential stress criterion. The coplanar crack growth rate correlates well with a combination of ∆K ef f ective I and ∆K ef f ective II .

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Section: Crack Growth Ratesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Fatigue crack growth under non-proportional mixed-mode I + II. Role of compression while shearing

Bonniot

Doquet

Hai

2020

International Journal of Fatigue

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“…Recently, mixed mode II/III experiments were also performed on a rail steel considering RCF. Bonniot et al [10] performed the experiments to determine the FCG thresholds and kinetics under loading conditions using asymmetric four-point bending specimens with different angles between the crack front and the shear load. They determined that a coplanar shear-mode FCG occurred with the high loading ranges.…”

Section: Introductionmentioning

confidence: 99%

“…In the RP case, the branch FCG occurred at δ = 120 • . The growth rates were plotted against ∆K eq defined by Equation (10), which considers the ∆K III attenuation due to the crack face contact, giving a good correlation.…”

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confidence: 99%

Fatigue Crack Growth under Non-Proportional Mixed Mode Loading in Rail and Wheel Steel Part 2: Sequential Mode I and Mode III Loading

Akama

Kiuchi²

2019

Applied Sciences

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Rolling contact fatigue cracks in rail and wheel undergo non-proportional mixed mode I/II/III loading. Fatigue tests were performed to determine the coplanar and branch crack growth rates on these materials. Sequential and overlapping mode I and III loading cycles were applied to single cracks in round bar specimens. Experiments in which this is done have been rarely performed. The fracture surface observations and the finite element analysis results suggested that the growth of long (does not branch but grown stably and straight) coplanar cracks was driven mainly by mode III loading. The cracks tended to branch when increasing the material strength and/or the degree of overlap between the mode I and III loading cycles. The equivalent stress intensity factor range that can consider the crack face contact and successfully regressed the crack growth rate data is proposed for the branch crack. Based on the results obtained in this study, the mechanism of long coplanar shear-mode crack growth turned out to be the same regardless of whether the main driving force is in-plane shear or out-of-plane shear.

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“…This suggests it must have a quite universal explanation at the continuum scale. Segmentation has implications on lifetime predictions in engineering: turbines (Flavien, 2012), railways (Bonniot et al, 2018) or on the shape of stick-slip faults (Cambonie et al, 2019).…”

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confidence: 99%

Mode I+III multiscale cohesive zone model with facet coarsening and overlap: Solutions and applications to facet orientation and toughening

Lazarus

Prabel

Cambonie

et al. 2020

Journal of the Mechanics and Physics of Solids

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When subjected to some anti-plane shear mode III loading, segmentation of the crack front frequently occurs during propagation: even if the crack is initially planar, propagation produces facets/segments rotated toward the shear free direction. These facets induce some modifications in the local loading of the crack tips that can be captured through the multi-scale cohesive zone model proposed by Leblond et al., 2015. Assuming that the width of the facets is small in comparison to their length, the facets can be considered at the microscale, as a bidimensional periodic array of tilted cracks perpendicularly to the direction of propagation, and at the macroscale, as a growing Cohesive Zone. The model was developed initially supposing a constant period, small tilt angles and non-overlapping facets. The first aim of this paper is to relax these assumptions to deal with more realistic cases. For this, the microscale problem is solved using XFEM and the outputs are further incorporated into the model to get some results on the macroscale, in particular the effective fracture energy. The second objective is to introduce some experiments to show the relevance of the assumptions made and to demonstrate the ability of the approach (i) to determine the inclination of the facets and (ii) to quantify, in both fatigue and brittle fracture, the toughening due to the decrease of the crack opening driven by the unbroken ligaments between the facets.

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Mixed mode II and III fatigue crack growth in a rail steel

Cited by 36 publications

References 40 publications

Fatigue crack growth under non-proportional mixed-mode I + II. Role of compression while shearing

Fatigue crack growth under non-proportional mixed-mode I + II. Role of compression while shearing

Fatigue Crack Growth under Non-Proportional Mixed Mode Loading in Rail and Wheel Steel Part 2: Sequential Mode I and Mode III Loading

Mode I+III multiscale cohesive zone model with facet coarsening and overlap: Solutions and applications to facet orientation and toughening

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