Effects of hardness and crack geometry on .DELTA.Kth of small cracks.

Murakami, Yukitaka; Endo, Mitsuru

doi:10.2472/jsms.35.911

Cited by 110 publications

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“…In the case of soft metallic material, the evaluation method proposed by Murakami and Endo 3) cannot be applied directly.…”

Section: Introductionmentioning

confidence: 99%

“…It is noted that fatigue limit  w evaluation method proposed by Murakami and Endo 3) has been accepted or applied in many cases when a crack initiated from an inclusion. In the present study, their evaluation method was examined when cracks initiated from slip bands in crystals, and we examined how their method could be used as a kind of estimation method for other cases.…”

Section: Introductionmentioning

confidence: 99%

“…The fatigue limit  w of a smooth specimen has been evaluated by Vickers hardness HV. On the other hand, Murakami and Endo 3) proposed a method for evaluating the fatigue limit  w of a material containing defects by using the parameters of hardness and defect area. In this method, the evaluation of  w is performed while taking care of the relationships between the threshold stress of small crack growth, the defect size and the resistance of the material.…”

Section: Introductionmentioning

confidence: 99%

“…To apply the evaluation method of Murakami and Endo 3) to a case of a smooth specimen, the application of the threshold level of the stress intensity factor range 7) and the critical crack length l c , which is a parameter to represent a decreased value of the fatigue limit due to pre-existing defect 8) , should be considered. However, we calculated the area by using the initial crack length in the smooth specimen which was regarded as the size of the pre-existing defect in the present examination.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Study on Relationship among Crack Initiation Size, Fatigue Limit and Hall Petch Relation

Makabe¹,

Jafari²,

Ishikawa³

et al. 2017

J. Soc. Mat. Sci., Japan

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The relationship between the microstructure and fatigue limit of a smooth specimen of tool steel SK85 (0.83% carbon steel) was investigated. Also, the fatigue limit of pure copper was evaluated. Push-pull tests were performed under stress ratio R = -1. The initial length of a crack which initiates during the fatigue process is related to the size of a single crystal in the case of carbon steel. In this study, SK85 was chosen as a testing material to investigate the relationship between the microstructure and fatigue limit for the following reason. The original microstructure of the material used includes spherical microstructure. However, after annealing or normalizing under certain conditions, that microstructure changed to a lamellar microstructure. The fatigue limit of the heat treated SK85 could be evaluated by a relation in which the parameters are the hardness and initial crack length. The crack initiation sizes were related to the microstructure. The method of evaluating fatigue limit was investigated in consideration of the crack initiation size or the sizes of microstructures. Also, it was discussed the fact that the crack growth rate of SK85 was related to the condition of ferrite grain distributions. For the purpose of investigating the method of evaluating the fatigue limit, experiments with smooth and holed specimens of copper were performed. Furthermore, we investigated the relationship between the Hall Petch Relation and the method of evaluating fatigue limit in this study.

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“…In the case of soft metallic material, the evaluation method proposed by Murakami and Endo 3) cannot be applied directly.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Study on Relationship among Crack Initiation Size, Fatigue Limit and Hall Petch Relation

Makabe¹,

Jafari²,

Ishikawa³

et al. 2017

J. Soc. Mat. Sci., Japan

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show abstract

“…After extensive research, Murakami and Endo [9] developed fatigue strength prediction models for the high cycle regime based on surface defects and internal voids or inclusions. The main parameters of these models are the size of defect or inclusion ( area ) and Vickers hardness (Hv) [6], [9].…”

Section: Introductionmentioning

confidence: 99%

Fatigue Strength Prediction Formulae for Steels and Alloys in the Gigacycle Regime

Bandara¹,

Siriwardane²,

Dissanayake³

et al. 2013

IJMMM

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Abstract-Most existing fatigue strength prediction models contain parameters related to the critical size of non metallic inclusions or defects. Finding the critical size of the inclusion or defect which causes the fatigue failure is not easy. Further, obtaining experimental stress life curves for gigacycles is expensive and time consuming. Therefore it is important to discover simple but reliable fatigue strength prediction formulae that use easily obtainable material parameters while being independent from the size of inclusions or defects. This paper proposes a new formula for predicting fatigue strengths of steels in the gigacycle regime using the ultimate tensile strength and Vickers hardness as material parameters while introducing a reliable substitute to the critical inclusion size. The formula is verified using published experimental results for forty five steels. Another formula for predicting fatigue strengths of steels and alloys is proposed using more than hundred experimental fatigue strength values at various numbers of failure cycles in the gigacycle regime.Index Terms-Fatigue strength, gigacycles, inclusion and defect, stress life curve, tensile strength.

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Stress Concentration in Three Dimensional Problems

Murakami

2016

Theory of Elasticity and Stress Concentration

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Effects of hardness and crack geometry on .DELTA.Kth of small cracks.

Abstract: The dependence of ƒ¢Kth on crack size and material properties under stress ratio R=-1 was studied on various materials and microstructures. The values of ƒ¢Kth for all the materials investigated were standardized with one geometrical and one material parameter.

Cited by 110 publications

References 0 publications

A Study on Relationship among Crack Initiation Size, Fatigue Limit and Hall Petch Relation

A Study on Relationship among Crack Initiation Size, Fatigue Limit and Hall Petch Relation

Fatigue Strength Prediction Formulae for Steels and Alloys in the Gigacycle Regime

Stress Concentration in Three Dimensional Problems

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