The growth of a fatigue crack approaching a perpendicularly-oriented, bimaterial interface

Suresh, S.; Sugimura, Y.; Tschegg, E. K.

doi:10.1016/0956-716x(92)90597-8

Cited by 126 publications

(71 citation statements)

References 9 publications

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“…These results are consistent with those previously published [2,6,7,28,29], which mostly used the J integral as CDF parameter. Elasto-plastic stress analyses of bearings in operation have predicted LSY [30,31]; CTOD could thus prove to be a reliable indicator of crack growth under such conditions.…”

Section: Discussionsupporting

confidence: 93%

“…These multilayered systems provide the required compromise between stiffness and tribological performance through a stiff backing layer and a conformable and low-friction lining. An additional attribute of multi-layered structures is the shielding effect that reduces the growth rate as cracks approach stiffer layers [2][3][4][5], thus increasing service life. The opposite effect is observed as a crack approaches a more compliant layer.…”

Section: Introductionmentioning

confidence: 99%

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Fatigue crack shielding and deflection in plain bearings under large-scale yielding

Burke-Veliz

Syngellakis

Reed

2010

Engineering Failure Analysis

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Multi-layered bearing systems used in the automotive industry show shielding and antishielding effects that reduce or amplify the crack driving force under large scale yielding conditions. Using finite element analysis, it is shown that shielding in such systems results in path deflection and bifurcation despite the absence of mixed-mode loading. As the crack approaches a stiff layer, the tangential strains measured around a blunted crack tip model show a maximum corresponding to the direction of crack propagation. The distribution of such strains indicates the effect of shielding and the likelihood of the tip to deflect or bifurcate. The suitability of bi-layer and tri-layer bearing architectures is assessed through crack path and respective crack driving force predictions.

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Section: Discussionsupporting

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Fatigue crack shielding and deflection in plain bearings under large-scale yielding

Burke-Veliz

Syngellakis

Reed

2010

Engineering Failure Analysis

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“…The figure shows a consistent hardness variation of the order of 10H v between the harder light bands and the comparatively soft dark bands. In the first instance the deflected nature of crack growth in the weld nugget may then be a consequence of the mechanical interaction between a crack and layers of hard and soft material, with the results of Suresh et al [7] for example showing the reduction in crack driving force that may occur as a crack moves from a layer of low yield strength to one of higher strength. Whilst the measured hardness changes are only of the order of 10% and additional intrinsic influences of microstructural variations between bands (as evidenced by the hardness changes in themselves) cannot be ruled out, the 'sense' of the crack deflections in the present welds is consistent with such a layer hardness effect, with deflection around the nugget occurring at transitions between low to high hardness material (see Fig.…”

Section: Discussionmentioning

confidence: 99%

Fatigue of Friction Stir Welded 2024-T351 Aluminium Alloy

Booth

Sinclair

2002

MSF

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Abstract. Fatigue failure characteristics of friction stir welds in 13mm gauge 2024-T351 plate have been assessed. Failure occurred from either the weld region (nugget/flow arm) or from the material immediately surrounding the weld. Fatigue failure from the surrounding material was essentially conventional, initiating from large S-phase intermetallic particles and growing in a macroscopic mode I manner. Corresponding fatigue lives were seen to be comparable to parent plate and results previously reported for similar welds in thinner plate. Failure over the weld region was identified with discontinuities in the macroscopic flow pattern of the weld flow arm. Subsequent crack growth showed pronounced macroscopic crack deflection around the 'onion ring' structure of the weld nugget. The bands making up the onion rings were identified with variations in local hardness levels, consistent with a mechanical contribution to the crack deflection process.

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“…The behaviour of cracks propagating toward bimaterial interfaces has been characterized in a series of experiments by Suresh and Sugimura [9,[25][26][27]. The results of these studies show that the ability of a given crack to penetrate a bimaterial interface is dependent on the strength of the material in which it is propagating where the term 'strength' is defined by the strain hardening response and ultimate tensile strength [10,25].…”

Section: Discussionmentioning

confidence: 99%

Effect of Ductile Thermal Spray Coatings on Fatigue Performance of 7075-T651 Aluminum Alloy

Arsenault¹,

Lynn²,

DuQuesnay³

2005

Canadian Metallurgical Quarterly

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-The fatigue behaviour of 7075-T651 Al alloy with ductile aluminum thermal sprayed coatings deposited by four different commercial arc spray devices (guns) has been characterized. Coated specimens as well as polished and shot peened specimens were evaluated under fully reversed uniaxial loading at a constant amplitude of ±225 MPa. While the shot peening pretreatment was observed to increase the fatigue resistance of polished specimens, application of the coatings subsequently reduced fatigue life to below that of the original polished coupons. Changes in the residual stress state of the shot peened surface were identified as the most likely source of these reductions, even though no microstructural changes in the substrate were perceptible. Variations in fatigue life were also observed between the coatings resulting from the four spray guns. The roles of surface roughness and coating delamination in producing these decreases were investigated and stress concentrations resulting from coating delamination were identified as the primary detrimental factor affecting fatigue resistance.Résumé -On a caractérisé le comportement de fatigue de l'alliage d'Al 7075-T651 avec des revêtements ductiles d'aluminium déposés par métallisation à chaud au moyen de quatre dispositifs (fusils) commerciaux différents de fusion en arc électrique. On a évalué des échantillons revêtus ainsi que des échantillons polis et traités par grenaillage sous une charge uniaxe entièrement alternée à une amplitude constante de ± 225 MPa. Alors que l'on a observé que le prétraitement par grenaillage augmentait la résistance à la fatigue des spécimens polis, l'application des revêtements réduisait ultérieurement l'endurance au-dessous de celle des échantillons polis originaux. On a identifié des changements dans l'état de contrainte résiduelle de la surface traitée par grenaillage comme étant la source la plus probable de ces réductions, même si aucun changement de la microstructure dans le substrat n'était perceptible. On a également observé des variations dans l'endurance entre les revêtements résultant des quatre fusils de métallisation. On a investigué le rôle de la rugosité de surface et du délaminage du revêtement sur la production de ces diminutions et l'on a identifié la concentration des contraintes résultant du délaminage du revêtement comme facteur défavorable primaire affectant la résistance à la fatigue.

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The growth of a fatigue crack approaching a perpendicularly-oriented, bimaterial interface

Cited by 126 publications

References 9 publications

Fatigue crack shielding and deflection in plain bearings under large-scale yielding

Fatigue crack shielding and deflection in plain bearings under large-scale yielding

Fatigue of Friction Stir Welded 2024-T351 Aluminium Alloy

Effect of Ductile Thermal Spray Coatings on Fatigue Performance of 7075-T651 Aluminum Alloy

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