Effects of graphite shape, size and distribution on the fatigue strength of spheroidal graphite cast irons.

正浩, 遠藤

doi:10.2472/jsms.38.1139

Cited by 21 publications

(8 citation statements)

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“…[39][40][41][42][43] It was also found that the fatigue limit is not a limit stress for nucleation but rather the threshold stress for non-propagation of a small crack emanating from a graphite particle or defect. [39][40][41][42][43] It was also found that the fatigue limit is not a limit stress for nucleation but rather the threshold stress for non-propagation of a small crack emanating from a graphite particle or defect.…”

Section: Introductionmentioning

confidence: 99%

“…It was found that the largest defect, such as the maximum size of graphite particle, artificial notches, or casting defect (eg, micro-shrinkage cavity), plays a dominant role in determining fatigue strength of ductile cast irons. [39][40][41][42][43] It was also found that the fatigue limit is not a limit stress for nucleation but rather the threshold stress for non-propagation of a small crack emanating from a graphite particle or defect. For this reason, small defects are similar to cracks.…”

Section: Introductionmentioning

confidence: 99%

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Novel method for the fatigue strength assessment of heavy sections made by ductile cast iron in presence of solidification defects

Borsato

Ferro

Berto³

2018

Fatigue Fract Eng Mat Struct

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The fatigue strength of ferritic, pearlitic, and solution strengthened ferritic ductile irons taken from heavy sections and characterized by long solidification times has been assessed. Starting from the idea of Murakami and co‐workers, a new model for the prediction of the fatigue strength is proposed. It allows a sound fatigue assessment of the fatigue strength of as‐cast ductile irons containing solidification defects, such as low nodule count, exploded, chunky and spiky graphite, or microshrinkage porosities. The newly developed equation validated by means of an extensive benchmarking with data taken from the literature has shown a very high potential for applications to thick‐walled components.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Novel method for the fatigue strength assessment of heavy sections made by ductile cast iron in presence of solidification defects

Borsato

Ferro

Berto³

2018

Fatigue Fract Eng Mat Struct

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show abstract

“…Unfortunately, cast irons are susceptible to brittle fracture caused by the presence of graphite inclusions which play the role of microscopic stress concentrators and promote the processes of nucleation and growth of cracks. There exist many studies on the effects of the shape and size of graphite nodules, of casting defects (microshrinkage) (Ref [1][2][3][4][5][6][7][8][9][10][11][12][13] and of microstructure ( Ref 1,6,9) on the fatigue strength of nodular cast iron.…”

Section: Introductionmentioning

confidence: 99%

Influence of Graphite Nodules Geometrical Features on Fatigue Life of High-Strength Nodular Cast Iron

Costa

Machado

Silva

2008

J. of Materi Eng and Perform

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This paper is concerned with the evaluation of different fatigue strength theories to predict the fatigue life of high-strength nodular cast iron. There have been some studies on the effects of the shape and size of graphite nodules, and of microstructure, on the fatigue strength of nodular cast iron. However, there is not a consensus on how to correlate the fatigue limit with material intrinsic properties or with external features such as considering graphite nodules as defects. Some researchers found good correlations between fatigue strength, r w0 , and the geometrical aspects of the graphite nodules, considering it as internal material defects. It will be shown in this study that geometrical features such as shape, size, and relative position seem to be adequate to be included in those predictions. In this article, a high-strength cast iron, with rupture strength of about 1300 MPa and YoungÕs modulus of about 160 GPa, has been used. Correlations both with intrinsic properties as well as with other geometrical effects have been made. A comparison of different theories has also been carried out.

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“…Some of these applications feature a varying wall thickness, which yields different graphite morphologies throughout the component. The graphite morphology influences the endurance limit of nodular cast irons [2,3]. In many industrial applications, during the design process elastic stresses are calculated using FE-analysis.…”

Section: Introductionmentioning

confidence: 99%

Influence of graphite morphology on static and cyclic strength of ferritic nodular cast iron

et al. 2018

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Abstract. High silicon alloyed nodular cast iron consists of a purely ferritic matrix and graphite nodules, mainly. Varying wall thicknesses and manufacturing conditions result in different graphite morphologies throughout a structural component. From an experimental point of view, axial fatigue and tensile tests were carried out on specimens with differently degraded graphite. From a numerical point of view, the microstructure has been modelled using a finite element (FE) approach with representative volume elements (RVE). The RVE models were built according to micrographs of fatigue specimens. The generated RVEs determine effective material properties through elasto-plastic homogenization and were subsequently analysed using a shakedown approach. In shakedown theory, the material re-enters the elastic regime after a few cycles of initial plastic deformation. This work uses the shakedown theorem to derive a lower bound estimation of the endurance limit from a non-incremental simulation. Here, the material has to be modelled elastic-perfectly plastic. The major challenge in modelling nodular cast iron is to determine suitable material parameters for the graphite and ferrite phase, revealed by parameter studies on the static and cyclic model. By using reasonable material parameters, fundamental effects, observed in the fatigue tests, were reproduced on the model level.

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Effects of graphite shape, size and distribution on the fatigue strength of spheroidal graphite cast irons.

Cited by 21 publications

References 1 publication

Novel method for the fatigue strength assessment of heavy sections made by ductile cast iron in presence of solidification defects

Novel method for the fatigue strength assessment of heavy sections made by ductile cast iron in presence of solidification defects

Influence of Graphite Nodules Geometrical Features on Fatigue Life of High-Strength Nodular Cast Iron

Influence of graphite morphology on static and cyclic strength of ferritic nodular cast iron

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