Journal ArticleDOI
High-cycle rotating bending fatigue property in very long-life regime of high-strength steels
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In this paper, the fatigue properties of high-strength steels in the very long-life regime up to over 10 9 cycles were investigated, and the residual stress on the specimen surface of the ground specimen was examined by X-ray diffractometer.Abstract:
In order to investigate the fatigue properties of high-strength steels in the very long-life regime up to over 10 9 cycles, cantilever-type rotating bending fatigue tests were carried out for two kinds of high-strength steels, SUJ2 and SNCM439, which were machined by grinding and finished by electropolishing after grinding. And also, the residual stress on the specimen surface of the ground specimen was examined by X-ray diffractometer in order to investigate effects of the residual stress on the fatigue properties. From the investigations, the S-N curves clearly have a tendency to decrease again in the longer-life range over 10 7 cycles for both types of specimen and for both steels. From observations of fracture surfaces, it was found that fatigue crack origins could be grouped into two types: (i) 'surface crack origin type' in the shorter-life regime and (ii) 'internal crack origin type' in the longer-life regime.read more
Citations
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Journal ArticleDOI
Effects of inclusions on very high cycle fatigue properties of high strength steels
TL;DR: In this article, the effect of inclusion size on fatigue behavior of high strength steels in the very high cycle fatigue (VHCF) regime (>10(7) - 10(9) cycles is reviewed.
Journal ArticleDOI
Very high cycle fatigue properties of bainitic high carbon–chromium steel
TL;DR: In this article, the authors investigated the fatigue properties of bainitic 100Cr6 (SAE 52100, JIS SUJ2) steel in the high cycle and very high cycle fatigue (VHCF) regime.
Journal ArticleDOI
Notch effect on fatigue strength reduction of bearing steel in the very high cycle regime
TL;DR: In this paper, the authors performed ultrasonic fatigue tests with smooth and notched bearing steel of two batches (JIS SUJ2-A and SUJ 2-B) and found that the S-N curves obtained from the smooth specimens were different and both did not show a distinct two-step.
Journal ArticleDOI
Very high cycle fatigue properties of bearing steel under axial loading condition
TL;DR: In this article, the S-N curve of high carbon-chromium bearing steel was investigated under axial loading fatigue in the very high cycle fatigue regime, and three fracture modes were observed on the fracture surface, such as surface-induced fracture, subsurface inclusion induced fracture without granular bright facet (GBF) area and that with GBF area around an inclusion.
Journal ArticleDOI
The nature and the mechanism of crack initiation and early growth for very-high-cycle fatigue of metallic materials – An overview
Youshi Hong,Chengqi Sun +1 more
TL;DR: In this article, the authors summarized the research progress on the crack initiation characteristics and the related mechanisms for VHCF of metallic materials and proposed a new model of Numerous Cyclic Pressing to explain the formation mechanism of FGA, and Verification of proposed NCP model.
References
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Journal ArticleDOI
There is no infinite fatigue life in metallic materials
TL;DR: In this paper, the shape of the S-N curve beyond 10 7 cycles is unknown except in some statistical approaches, and this is also true for the fatigue limit, and the standard deviation applied to the average fatigue limit is certainly not the best way to reduce the risk of rupture in fatigue.
Journal ArticleDOI
Factors influencing the mechanism of superlong fatigue failure in steels
Y Murakam,T Nomoto,T Ueda +2 more
TL;DR: In this article, a particular fatigue fracture morphology in the vicinity of the fracture origin (non-metallic inclusions) of a heat-treated alloy steel, SCM435, was tested to N ≥ 10 8.
Journal ArticleDOI
Quantitative Evaluation of Effects of Nonmetallic Inclusions on Fatigue Strength of High Strength Steel
TL;DR: In this paper, the effects of nonmetallic inclusions on the fatique strength of metals are reviewed and the influential factors are revealed, and the equation for the prediction of the threshold stress intensity factor range ΔKth and fatigue limit σw for defects and small cracks was applied to predict those for inclusions contained in high strength steels.
Journal ArticleDOI
The fatigue limit and its elimination
TL;DR: In this paper, the authors discuss the causes leading to the elimination of the classical fatigue limit of ferrous metals, including the introduction of transitory cyclic-dependent mechanisms and time-dependent processes that will permit a previously non-propagating crack to grow across the different threshold states expressed in terms of linear-elastic fracture mechanics (LEFM), elastic-plastic fracture Mechanics (EPFM) and microstructural fracture mechanics(MFM).
Journal ArticleDOI
Fatigue strength characteristics of high strength steel.
Hideki Emura,Katsutoshi Asami +1 more
TL;DR: In this paper, rotating bending fatigue tests were conducted in laboratory air and dry air using smoothened specimens with 8 mm diameter, and no fatigue limits were observed in the long life range up to 109 cycles (10 months).
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