Fatigue crack growth behaviour in ferritic ductile iron with surface crack under reverse bending

Akdemir, Ahmet; Tekeli, Mehmet; Ataberk, Necati

doi:10.1016/j.commatsci.2007.02.015

Cited by 3 publications

(3 citation statements)

References 3 publications

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“…In addition, there are no methods that can be used to identify the direction of crack propagation in the fracture surface of a particular FDI. In general, the investigations about DI have been focused on the study of the mechanical properties using mechanical tests under different loading configurations . Some articles analyse the effect of the graphite nodule on the fracture process either experimentally or via computational techniques, mainly focusing on the nucleation and growth of voids as a result of the matrix–graphite interphase debonding .…”

Section: Introductionmentioning

confidence: 99%

“…In general, the investigations about DI have been focused on the study of the mechanical properties using mechanical tests under different loading configurations. [7][8][9][10][11][12][13][14] Some articles analyse the effect of the graphite nodule on the fracture process either experimentally or via computational techniques, mainly focusing on the nucleation and growth of voids as a result of the matrix-graphite interphase debonding. [15][16][17][18][19][20][21][22] In most papers, the fracture surface analysis has been a brief secondary study.…”

Section: Introductionmentioning

confidence: 99%

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Study of the fracture of ferritic ductile cast iron under different loading conditions

Fernandino

Boeri

2014

Fatigue Fract Eng Mat Struct

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This work is a continuation of the studies presented in a recent paper by the authors, where the fracture surfaces of pearlitic ductile cast iron under different loading conditions were exhaustively analysed. In this study, fracture surfaces of ferritic ductile cast iron (or ferritic spheroidal graphite cast iron) generated under impact, bending and fatigue loading conditions were characterised and compared. The fracture surfaces were characterised qualitatively and quantitatively from the observation under a scanning electron microscope. The fracture mechanisms in each case were identified. For impact tests, as test temperature increases, the dominant fracture mechanism changes from brittle to ductile. For bending tests, a fully ductile fracture micromechanism dominates the surface. In fatigue tests, the surface shows a mix of flat facets that appear to be cleavage facets and ductile striations, but the typical fatigue striations are not easily found on the fracture surface. Methodologies for the determination of the macroscopic direction of main crack propagation in both ductile and brittle failure modes are proposed. These allow identifying main crack propagation direction with good approximation. The results are potentially useful to identify the nature of loading conditions in a fractured specimen of ferritic spheroidal graphite cast iron. The authors believe that it is necessary to extend the methodologies proposed in samples with different geometry and size, before they can be used to provide additional information to the classical fractographic analysis.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Study of the fracture of ferritic ductile cast iron under different loading conditions

Fernandino

Boeri

2014

Fatigue Fract Eng Mat Struct

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“…There are four common failure modes of metal materials, which are cleavage fracture, ductile fracture, intergranular fracture, and fatigue [4,5]. The mechanical properties and fracture mechanism of ductile iron at different conditions have mainly been investigated [6][7][8][9][10][11][12]. In the in situ experiment, Di Cocco [13] observed the surface of tensile specimen by scanning electron microscope, and found that the main damage mechanism of FDI is the nucleation and propagation of graphite nodule cracks caused by the decrease of solubility of γ phase carbon ('Onion-like' mechanism).…”

Section: Introductionmentioning

confidence: 99%

Study of fractography of ferritic ductile iron at different temperatures and loading conditions

Wang,

Sun

et al. 2024

Mater. Res. Express

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This study characterizes the fractography of ferritic ductile iron under various loads, including tensile, fatigue and bending, and impact conditions. The results indicate that ductile fracture is the primary mechanism observed during tensile testing at room temperature. The fractography resulting from fatigue testing exhibits characteristics similar to cleavage fracture, and explains the formation of fatigue striations caused by the joint effects of dislocation slip and oxidation under crack tip stress. Under impact testing, the main fracture mechanism transitions from ductile to brittle with decreasing temperature. At high temperatures, fractography is mainly characterized by elliptical dimples with graphite nodules at the center that deform along the stress direction. In the ductile-brittle transition temperature range, a mixed fracture mechanism involving both dimples and cleavage patterns is observed. At low temperatures, the fracture mechanism is cleavage fracture, cleavage fracture is mainly caused by the deformation twin, inducing crack nucleation. These findings further validate D.O.Frenandino's quantitative analysis method for determining the main crack propagation direction of ductile fracture and brittle fracture. By employing larger statistical datasets, it is shown that this method yields high accuracy in determining the main crack propagation direction of ferritic ductile iron, thereby promoting its application as a general method for impact fractography anlysis.

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Marker load-aided bidirectional fatigue crack growth rate measurement via a semi-elliptical surface crack

Dong

2018

International Journal of Fatigue

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Fatigue crack growth behaviour in ferritic ductile iron with surface crack under reverse bending

Cited by 3 publications

References 3 publications

Study of the fracture of ferritic ductile cast iron under different loading conditions

Study of the fracture of ferritic ductile cast iron under different loading conditions

Study of fractography of ferritic ductile iron at different temperatures and loading conditions

Marker load-aided bidirectional fatigue crack growth rate measurement via a semi-elliptical surface crack

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