A study of natural cracks initiated on casting defects by crack front marking

Nadot, Y.; Ranganathan, N.; Méndez, J.; Béranger, A.S.

doi:10.1016/s1359-6462(97)00158-9

Cited by 25 publications

(20 citation statements)

References 5 publications

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“…Since the first observations of SFCs at the surface of Al fatigue samples by optical microscopy [2], more sophisticated techniques involving beach marking using ink [11] or change in environment [12], serial polishing [13], focused ion beam (FIB) milling [14] and synchrotron microtomography [15,16] have been used to study the relationship between local microstructure and the 3-D growth of SFCs. All these techniques have merits and disadvantages.…”

Section: Introductionmentioning

confidence: 99%

3-D growth of a short fatigue crack within a polycrystalline microstructure studied using combined diffraction and phase-contrast X-ray tomography

Herbig¹,

King²,

Reischig³

et al. 2011

Acta Materialia

174

109

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X-ray diffraction contrast tomography is a recently developed, non-destructive synchrotron imaging technique which characterizes microstructure and grain orientation in polycrystalline materials in three dimensions. By combining it with propagation-based phasecontrast tomography it is possible to get a full picture description for the analysis of local crack growth rate of short fatigue cracks in three dimensions: the three-dimensional crack morphology at different propagation stages, and the shape and orientation of the grains around the crack. An approach has been developed on the metastable beta titanium alloy Ti 21S that allows for visualization and analysis of the growth rate and crystallographic orientation of the fracture surface.

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Section: Introductionmentioning

confidence: 99%

3-D growth of a short fatigue crack within a polycrystalline microstructure studied using combined diffraction and phase-contrast X-ray tomography

Herbig¹,

King²,

Reischig³

et al. 2011

Acta Materialia

174

109

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“…Two materials have been fatigued close to the fatigue limit: a nodular cast iron containing natural defects and a C 35 carbon steel containing artificial defects. The two materials have been tested in many different conditions with a careful observation of damage at the tip of the defect, for different sizes and geometries of defects [10][11][12][13][14]. Fig.…”

Section: Fatigue Mechanisms In the Giga Cycle Regimementioning

confidence: 99%

“…2a). The NPC have been revealed by alternating environment during the fatigue loading (see [10,11] for more details). Even if the length of the crack at the surface of the sample is important (350 μm), the cracked area in the bulk is not so important as compared to the size of the defect, and the micro-crack does not encircle the defect, it seems therefore, difficult to consider the defect equivalent to a crack.…”

Section: Fatigue Mechanisms In the Giga Cycle Regimementioning

confidence: 99%

Propagation Lifetime from the Surface and Internal Defects in the Ultra High Cycle Fatigue Regime~!2008-03-10~!2008-05-06~!2008-07-03~!

Nadot¹

2010

TOMSJ

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Ultra High Cycle fatigue leads to a failure initiated in the bulk material of a material. Some results on the nodular cast iron are presented: initiation occurs from the defects, located at the surface or in the bulk. It has been shown that environment plays a major role that could explain the difference between fatigue lives, for the surface and internal initiation. The influence of the defect size and crack growth law is discussed and, the importance of fatigue crack initiation stage is revealed, in the ultra high cycle regime

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“…2) and R = −1 6 . These parameters will be used throughout the present paper, although it is worth noting that corrosive environments could lead to other crack propagation parameters in the vicinity of a free surface 8 and under complex multiaxial stress states 9 . In particular, it is well known that a salt‐water environment that exists in off‐shore and near‐shore structures can seriously affect the fatigue resistance of materials, components and structures.…”

Section: The Studied Materialsmentioning

confidence: 99%

A probabilistic approach to predict the very high‐cycle fatigue behaviour of spheroidal graphite cast iron structures

Chantier

Bobet

Billardon

et al. 2000

Fatigue Fract Eng Mat Struct

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A new probabilistic approach is developed to study structures made of spheroidal graphite cast iron and subjected to very high‐cycle fatigue. Until now, the probabilistic approach was based on S–N curves obtained from experiments carried out only until 107 cycles. To validate this approach, failure predictions relating to the safety of components are computed and compared to experimental results. In addition to this development, an extension is proposed in order to improve the very long life assessment of complex structures. An extrapolation of the previous fatigue results to 109–1011 cycles illustrates the error made on cumulative failure probabilities. Finally, the respective influence of the casting flaw distribution, volume and stress field heterogeneity within specimens and industrial components is studied.

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A study of natural cracks initiated on casting defects by crack front marking

Cited by 25 publications

References 5 publications

3-D growth of a short fatigue crack within a polycrystalline microstructure studied using combined diffraction and phase-contrast X-ray tomography

3-D growth of a short fatigue crack within a polycrystalline microstructure studied using combined diffraction and phase-contrast X-ray tomography

Propagation Lifetime from the Surface and Internal Defects in the Ultra High Cycle Fatigue Regime~!2008-03-10~!2008-05-06~!2008-07-03~!

A probabilistic approach to predict the very high‐cycle fatigue behaviour of spheroidal graphite cast iron structures

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