Effects of defects, inclusions and inhomogeneities on fatigue strength

Murakami, Yukitaka; Endo, Mitsuru

doi:10.1016/0142-1123(94)90001-9

Cited by 868 publications

(538 citation statements)

References 27 publications

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“…The fatigue limit which corresponds to the threshold condition in Eq. (12), DCTD ¼ DCTD th , is almost identical to that proposed by [25] for R ¼ À1; it differs slightly for other R-ratios, but the Murakami-Endo relation is consistent with experimental observations of small crack growth [4] and our calculations for the R-ratio dependence of da=dN .…”

Section: Propagationsupporting

confidence: 79%

Microstructure-based fatigue modeling of cast A356-T6 alloy

McDowell

Gall

Horstemeyer

et al. 2003

Engineering Fracture Mechanics

326

207

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High cycle fatigue (HCF) life in cast Al-Mg-Si alloys is particularly sensitive to the combination of microstructural inclusions and stress concentrations. Inclusions can range from large-scale shrinkage porosity with a tortuous surface profile to entrapped oxides introduced during the pour. When shrinkage porosity is controlled, the relevant microstructural initiation sites are often the larger Si particles within eutectic regions. In this paper, a HCF model is introduced which recognizes multiple inclusion severity scales for crack formation. The model addresses the role of constrained microplasticity around debonded particles or shrinkage pores in forming and growing microstructurally small fatigue cracks and is based on the cyclic crack tip displacement rather than linear elastic fracture mechanics stress intensity factor. Conditions for transitioning to long crack fatigue crack growth behavior are introduced. The model is applied to a cast A356-T6 Al alloy over a range of inclusion severities.

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Section: Propagationsupporting

confidence: 79%

Microstructure-based fatigue modeling of cast A356-T6 alloy

McDowell

Gall

Horstemeyer

et al. 2003

Engineering Fracture Mechanics

326

207

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“…The values of stress intensity factor range at the periphery of inclusion (ΔK Inc ), FGA (ΔK FGA ) and fisheye (ΔK fisheye ) are calculated by using the following equation [26]: where local  is the local stress and area is the equivalent size of inclusion, FGA or fisheye. For the specimens having experienced the rotating bending test, the local stress was calculated as:…”

Section: Resultsmentioning

confidence: 99%

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Lei

Xie

Sun

et al. 2013

Sci. China Phys. Mech. Astron.

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The specimens of a high carbon chromium steel were quenched and tempered at 150°C, 180°C and 300°C. Such specimens were tested via rotating bending and a push-pull type of axial loading to investigate the influences of loading condition on the behaviour of very-high-cycle fatigue (VHCF). Experimental results show the different influences of inclusion size on the fatigue life for the two loading conditions. Predominant factors and mechanism for the fine-granular-area (FGA) of crack origin were discussed. In addition, a reliability analysis based on a modified Tanaka-Mura model was carried out to evaluate the sensitivity of inclusion size, stress, and K FGA to the life of VHCF crack initiation.

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“…The allowable impurity content of steel, the morphology of impurities and their influence on steel strength (mainly under variable loads) have been analyzed by numerous authors. Despite years of research and analyses, our knowledge of the impact of non-metallic inclusions on the properties of steel elements is still ambiguous and limited [5,[10][11][12]. The aim of this study was to determine the influences of large non-metallic inclusions on bending fatigue strength hardened and tempered performed on industrially manufactured high-grade, carbon structural steel of high purity.…”

Section: Introductionmentioning

confidence: 99%

Influence Of Large Non-Metallic Inclusions On Bending Fatigue Strength Hardened And Tempered Steels

Lipiński

Wach

Detyna

2015

Advances in Materials Science

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The article discusses the effect of large oxide impurities (a diameter larger than 10 µm in size) on the fatigue resistance of structural steel of high purity during rotary bending. The study was performed on 7 heats produced in an industrial plant. The heats were produced in 140 ton electric furnaces. All heats were desulfurized. The experimental material consisted of semi-finished products of high-grade, carbon structural steel with: manganese, chromium, nickel, molybdenum and boron. Steel sections with a diameter of 18 mm were hardened from austenitizing by 30 minutes in temperature 880 o C and tempered at a temperature of 200, 300, 400, 500 and 600°C for 120 minutes and air-cooled. The experimental variants were compared in view of the heat treatment options. Fatigue tests were performed with the use of a rotary bending machine at a frequency of 6000 cpm. The results were statistical processed and presented in graphic form. This paper discusses the results of the relative volume of large impurities, the fatigue strength for various heat processing options.

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Effects of defects, inclusions and inhomogeneities on fatigue strength

Cited by 868 publications

References 27 publications

Microstructure-based fatigue modeling of cast A356-T6 alloy

Microstructure-based fatigue modeling of cast A356-T6 alloy

Effects of loading condition on very-high-cycle fatigue behaviour and dominant variable analysis

Influence Of Large Non-Metallic Inclusions On Bending Fatigue Strength Hardened And Tempered Steels

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