Estimation of the size of GBF area on fracture surface for high strength steels in very high cycle fatigue regime

Yang, Zhen‐Guo; Li, S. X.; Liu, Y.B.; Li, Y. D.; Li, G. Y.; Wang, Hui; Weng, Yuqing

doi:10.1016/j.ijfatigue.2007.08.011

Cited by 56 publications

(42 citation statements)

References 10 publications

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“…For all the 17 groups of experimental data shown in Fig. 6, the experimental value is close to its mean value [34] GCr15 [24] 50CrV4 [33] 54SiCrV6 [33] G [35] GVM [35] GER [35] SUJ2 [14] QT1 [33] Number of cycles to failure 6 Ratio of experimental value K FGA to mean value K FGA versus fatigue life for present experimental data and those from the literature, in which the superscripts 1 and 2 denote the specimens by oil-quenching and tempering for 2.5 h in a vacuum at 150 • C under an ultrasonic test and a conventional frequency test, respectively, and the superscripts 3 and 4 denote the specimens by oil-quenching and tempering for 2.5 h in a vacuum at 300 • C under an ultrasonic test and a conventional frequency test, respectively GCr15 [34] GCr15 [24] 50CrV4 [33] 54SiCrV6 [33] G Experimental FGA size (μm) Fig. 7 Estimated FGA sizes as a function of the experimental data for each group of experimental results in Fig.…”

Section: Fga Size Estimationsupporting

confidence: 52%

“…Consider a mode-I internal penny crack with diameter d in an infinite solid under a uniform remote tensile stress σ , the maximum size of the plastic zone r p under the plane strain condition is [33] …”

Section: Model and Analysismentioning

confidence: 99%

“…Experimental fatigue life GCr15 (Present) QT1 [33] GCr15 [34] GCr15 4 [16] G [35] GER [35] 54SiCrV6 [33] 50CrV4 [33] Fig. 8 Comparison of predicted fatigue life by the proposed model using the experimental FGA size and the inclusion size with eight groups of experimental data in Fig.…”

Section: Predicted Fatigue Lifementioning

confidence: 99%

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A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime

2015

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In this paper, ultrasonic (20 kHz) fatigue tests were performed on specimens of a high-strength steel in very high cycle fatigue (VHCF) regime. Experimental results showed that for most tested specimens failed in a VHCF regime, a fatigue crack originated from the interior of specimen with a fish-eye pattern, which contained a fine granular area (FGA) centered by an inclusion as the crack origin. Then, a two-parameter model is proposed to predict the fatigue life of high-strength steels with fish-eye mode failure in a VHCF regime, which takes into account the inclusion size and the FGA size. The model was verified by the data of present experiments and those in the literature. Furthermore, an analytic formula was obtained for estimating the equivalent crack growth rate within the FGA. The results also indicated that the stress intensity factor range at the front of the FGA varies within a small range, which is irrespective of stress amplitude and fatigue life.

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Section: Fga Size Estimationsupporting

confidence: 52%

Section: Model and Analysismentioning

confidence: 99%

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A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime

2015

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“…Chai [13] reported that the formation of subsurface non-defect fatigue crack was caused by a material damage process of soft phase due to cyclic plastic deformation. Yang et al [23] measured the FGA of two spring steels and proposed a criterion to estimate the size of FGA. Hong et al [24] performed tests of a high carbon chromium steel and calculated fatigue life from FGA to fish-eye and from fish-eye to the critical crack size.…”

Section: Introductionmentioning

confidence: 99%

Very-high-cycle fatigue behavior of a structural steel with and without induced surface defects

Jiang

Sun

Liu

et al. 2016

International Journal of Fatigue

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a b s t r a c tFatigue tests via rotary bending were performed on the specimens with and without induced surface defects for a structural steel of medium carbon content to investigate the effect of surface defects on fatigue behavior in high-cycle fatigue and very-high-cycle fatigue (VHCF) regimes. The S-N data showed that induced surface defects substantially degraded the related fatigue strength. For the specimens without surface defects failed in VHCF regime, crack initiated from the interior of specimens with inclusions or matrix inhomogeneities as crack origin and the initiation regions were of different extents of rough surface. The observations on the profile samples cut from crack initiation regions revealed that the region was a layer of nanograins for the case of inclusion as crack origin, and was without grain refinement for the case of grain boundary as crack origin. For the specimens with induced surface defects, crack initiated from surface defects and the initiation region was without grain refinement. The characteristics of crack initiation were carefully examined and the effect of surface defects on fatigue strength degradation was analyzed by available models.

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“…The superscript asterisk in Fig. 7b denotes the experimental data by Murakami et al obtained from the reference by Yang et al [30], the superscripts 1 and 2 in Fig. 7g and h denote the specimens oilquenched and tempered for 2.5 h in vacuum at 300°C with furnace-cooling under ultrasonic test and conventional frequency test, respectively.…”

Section: Fatigue Strength Model and Analysismentioning

confidence: 99%

Effects of inclusion size and stress ratio on fatigue strength for high-strength steels with fish-eye mode failure

Sun

Lei

Xie

et al. 2013

International Journal of Fatigue

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a b s t r a c tExperimental results indicate that the fatigue life reduces by about two orders of magnitude when inclusion size doubles. Then, a model is proposed for predicting the fatigue strength of high-strength steels with fish-eye mode failure based on the experimental results for the effect of inclusion size and stress ratio. In the model, the effect of inclusion size a 0 and stress ratio R on fatigue strength r a is expressed as r a / a 0, where m and a are material parameters. The predicted results are in good agreement with our experimental results and the ones reported in literature.

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Estimation of the size of GBF area on fracture surface for high strength steels in very high cycle fatigue regime

Cited by 56 publications

References 10 publications

A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime

A two-parameter model to predict fatigue life of high-strength steels in a very high cycle fatigue regime

Very-high-cycle fatigue behavior of a structural steel with and without induced surface defects

Effects of inclusion size and stress ratio on fatigue strength for high-strength steels with fish-eye mode failure

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