Inclined defects and their effect on the fatigue limit and small crack growth

Roiko, Andrew; Solin, Jussi; Murakami, Yukitaka

doi:10.1051/matecconf/20141207002

Cited by 2 publications

(2 citation statements)

References 5 publications

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“…These results are shown in Fig. 14 [34,[42][43][44] are reasonably consistent within a scatter band described by both models. The scatter band of Fig.…”

Section: Effect Of Induced Surface Defect On Fatigue Strengthsupporting

confidence: 80%

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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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“…These results are shown in Fig. 14 [34,[42][43][44] are reasonably consistent within a scatter band described by both models. The scatter band of Fig.…”

Section: Effect Of Induced Surface Defect On Fatigue Strengthsupporting

confidence: 80%

“…Based on Eqs. (3) and (4), we calculated the values of fatigue limit (fatigue strength at 10 7 cycles) of the present case and several cases in literature [34,[42][43][44], and the calculated values were normalized by experimental data. These results are shown in Fig.…”

Section: Effect Of Induced Surface Defect On Fatigue Strengthmentioning

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 Cyclic-Plasticity-Based Mechanistic Approach for Fatigue Evaluation of 316 Stainless Steel Under Arbitrary Loading

Barua

Mohanty

Listwan

et al. 2017

Journal of Pressure Vessel Technology

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In this paper, a cyclic-plasticity-based fully mechanistic fatigue modeling approach is presented. This is based on time-dependent stress–strain evolution of the material over the entire fatigue life rather than just based on the end of live information typically used for empirical S∼N curve-based fatigue evaluation approaches. Previously, we presented constant amplitude fatigue test based related material models for 316 stainless steel (SS) base, 508 low alloy steel base, and 316 SS-316 SS weld which are used in nuclear reactor components such as pressure vessels, nozzles, and surge line pipes. However, we found that constant amplitude fatigue data-based models have limitation in capturing the stress–strain evolution under arbitrary fatigue loading. To address the aforementioned limitation, in this paper, we present a more advanced approach that can be used for modeling the cyclic stress–strain evolution and fatigue life not only under constant amplitude but also under any arbitrary (random/variable) fatigue loading. The related material model and analytical model results are presented for 316 SS base metal. Two methodologies (either based on time/cycle or based on accumulated plastic strain energy (APSE)) to track the material parameters at a given time/cycle are discussed and associated analytical model results are presented. From the material model and analytical cyclic plasticity model results, it is found that the proposed cyclic plasticity model can predict all the important stages of material behavior during the entire fatigue life of the specimens with more than 90% accuracy.

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Inclined defects and their effect on the fatigue limit and small crack growth

Cited by 2 publications

References 5 publications

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

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

A Cyclic-Plasticity-Based Mechanistic Approach for Fatigue Evaluation of 316 Stainless Steel Under Arbitrary Loading

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