Quantitative Evaluation Method of Fatigue Limit of Materials with Defects and its Investigation using Ductile Cast Iron.

Sugiyama, Yoshihiro; Asami, Katsutoshi; Matsuoka, Shinobu

doi:10.1299/kikaia.58.2287

Cited by 12 publications

(8 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Fatigue limits for the three ductile cast irons presented in Fig. 4, are plotted against Vicker's hardness, and also the data of FCD40 [5], ADI100 [6] were included for reference. Considering that the fatigue limits of series A and those of FCD40 would have similar fatigue behavior, it is possible to draw a straight line between those two points.…”

Section: Effects Of Mechanical Factors On Fatigue Limitsmentioning

confidence: 99%

“…8, plotted against the estimated maximum defect size through ESM. The data of ADI100, FCD40 and FCD70 [5] were collected together. It can be seen that the relationship between fatigue limits and maximum defect size is recurrent to a straight line in the log-log scale graph and directly arranged to the below Eq.…”

Section: Relationship Between Fatigue Limit and Maximum Defect Sizementioning

confidence: 99%

See 1 more Smart Citation

A study of several factors governing the fatigue limits of austempered ductile cast iron with various microstructures

Kim

2000

Metals and Materials

View full text Add to dashboard Cite

The effects the leading factors bearing on fatigue limits were investigated with three kinds of ductile iron specimens various microstructures. As a result of examination, the fatigue limits in relationship to hardness and tensile strength, the expected higher improvement for fatigue limits in the case of the high strength specimens that experienced austempering treatment are not observed in comparison with the specimens treated with stress relief treatment. The estimated maximum defect size is one of the important parameters in predicting and evaluating fatigue limits for three different heat-treated ductile cast irons. Also, a quantitative relationship can be established between the fatigue limit and maximum defect size. Moreover, it is possible to explain the difference in fatigue limits in the three ductile cast irons by application of the rates of non-propagating crack which connects the adjacent graphite nodules before it stops.

show abstract

Section: Effects Of Mechanical Factors On Fatigue Limitsmentioning

confidence: 99%

Section: Relationship Between Fatigue Limit and Maximum Defect Sizementioning

confidence: 99%

A study of several factors governing the fatigue limits of austempered ductile cast iron with various microstructures

Kim

2000

Metals and Materials

View full text Add to dashboard Cite

show abstract

“…Fatigue limits for three ductile irons are presented in Fig. 3, plotted against the Vicker's hardness, and also the data of FCD40 (Sugiyama, 1992), ADIlOO (Kato, 1997) andFCD60 andFCD70 (Endo, 1988) were put down for reference. Generally, the specimens of steels and irons which have the similar heat treatment history show the similar fatigue behavior.…”

Section: Testing Conditionsmentioning

confidence: 99%

“…(3). (Sugiyama, 1992) were shown together. It can be seen that the relationship between the fatigue limits and the maximum defect size are recurred to a straight line in the log-log scale graph and directly arranged to Eq.…”

Section: Relationship Between Fatigue Limits Andmentioning

confidence: 99%

Effects of structure and defect on fatigue limit in high strength ductile irons

Kim

2000

KSME International Journal

View full text Add to dashboard Cite

In this paper, the influence of several factors such as hardness, internal defect and non -propagating crack on fatigue limits was investigated with three kinds of ductile iron specimens. From the experimental results the fatigue limits were examined in relation with hardness and tensile strength in case of high strength specimens under austempering treatment; in consequence the marked improvement of fatigue limits were not showed. The maximum defect size was an important factor to predict and to evaluate the fatigue limits of ductile irons. And, the quantitative relationship between the fatigue limits (O'w) and the maximum defect sizes (Jareamax) was expressed as O'wn • ..; areamax= C 2 • Also, it was possible to explain the difference for the fatigue limits in three ductile irons by introduction of the non-propagating crack rates.

show abstract

“…In these studies, Endo et al (1)(2) regarded DI as a material containing defects and quantitatively evaluated its fatigue strength by applying the area parameter model (3) , which can predict the fatigue strength of specimens containing cracks, defects, or inclusions, using the Vickers hardness, HV, and defect size, area . Similarly, Sugiyama et al (4) (5) performed fatigue tests using several types of DI and applied the area parameter model to fatigue limit predictions. Further, they proposed a four-parameter method in order to evaluate the fatigue strength of the specimens having a large defect as well as that of the specimens having a small defect whose size is within the available range of the area parameter model.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Fatigue Strength of Ductile Cast Iron Composed of Ferrite-pearlitic Structures with As-cast Surfaces (Effect of Surface Roughness, Microstructure Transition Layers, Defects and Residual Stress on Fatigue Strength)

Yamabe¹,

Kobayashi²,

Nakajima³

2007

JMMP

View full text Add to dashboard Cite

In order to elucidate the complex effects of surface roughness, the transition of microstructures from the surface to the interior, defects and residual stress, tension-compression fatigue tests have been conducted by using shot blasted ferrite-pearlite ductile cast irons with as-cast surfaces. Regardless of the applied stress levels, the fracture origins of the specimens were mostly situated at a defect near an as-cast surface, slag, or pinhole at N f < 10 7. At a relatively lower stress amplitude, some fatigue fractures such as shrinkage occurred from an inner defect far from the surface, mostly at N f > 10 7. The area parameter model was applied to the quantitative evaluation of the fatigue limit. The equivalent hardness considering the transitional layers and the effective defect size with the interaction between the surface roughness and a defect were defined. Moreover, the relief of the residual stress during the fatigue tests was detected. The mean value of the relieved residual stress acting on a defect was employed for the quantitative evaluation. By using these parameters, the complex effects of ductile cast iron have been successfully evaluated for practical use.

show abstract

Quantitative Evaluation Method of Fatigue Limit of Materials with Defects and its Investigation using Ductile Cast Iron.

Cited by 12 publications

References 0 publications

A study of several factors governing the fatigue limits of austempered ductile cast iron with various microstructures

A study of several factors governing the fatigue limits of austempered ductile cast iron with various microstructures

Effects of structure and defect on fatigue limit in high strength ductile irons

Evaluation of Fatigue Strength of Ductile Cast Iron Composed of Ferrite-pearlitic Structures with As-cast Surfaces (Effect of Surface Roughness, Microstructure Transition Layers, Defects and Residual Stress on Fatigue Strength)

Contact Info

Product

Resources

About