Room temperature fatigue crack propagation in reactor graphites

Marshall, P.

doi:10.1016/0008-6223(73)90314-x

Cited by 23 publications

(6 citation statements)

References 15 publications

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“…3 that no fatigue failures occur within 10 s cycles for specimens that are cycled at maximum stresses below 46% UTS; this is in excellent agreement with reported endurance limits of 47% [29] and 49% [30] UTS for reverse bending of high density graphites. Likewise, by monitoring fatigue crack propagation in compact tension specimens, an endurance limit of about 50% UTS has been deduced for both a pressed high density graphite and an extruded lower density one [31 ]. Therefore, many graphites have essentially the same endurance limit for a given mode of fatigue testing when applied stresses are expressed as percentages of the mean tensile strengths for the graphites in question, as observed by Leichter and Robinson [29].…”

Section: Resultsmentioning

confidence: 95%

Fatigue behaviour of ATJ graphite

Bullock

1977

J Mater Sci

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Detailed S-N curves are presented for two modes of fatigue testing characterized by different minimum-to-maximum stress ratios, R. The endurance limit, or maximum applied stress below which there were no failures, increased from 46% UTS for R = --1 to 64% UTS for R = 0, or from 116 to 162 kgcm -2 . Thus, as the stress range narrowed for a given maximum stress, the endurance limit increased with mean stress. For ATJ specimens of a given tensile strength ai, the smallest value of maximum applied stress, OA, at which fatigue cracks propagated was defined by OA/ai ratios of 0.60 and 0.85 for R = --1 and R = 0, respectively. In addition, selected fatigue tests were conducted for several mean compressive stresses in order to complete the definition of a Goodman diagram for ATJ graphite.

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Section: Resultsmentioning

confidence: 95%

Fatigue behaviour of ATJ graphite

Bullock

1977

J Mater Sci

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“…The load levels were determined to ensure no macro--crack growth during cyclic testing, based on information on fatigue threshold of the material. 31 The stress intensity factor for mode I and mode II may be calculated by: 36 (1)…”

Section: Loading Arrangementmentioning

confidence: 99%

“…16 A few studies of fracture from notches have been carried out under mode II 26,27 and mixed mode 28,29 loading conditions, and the notch sensitivity of graphite has also been investigated using a strain energy density approach. 28,29 Some early studies 3,[30][31][32][33] have reported fatigue crack growth and fatigue lives of nuclear graphite. However, these offer limited insight into the material behaviour during crack growth under cyclic loading conditions, mainly due to the limitations in the methods of studies in the past.…”

Section: Introduction †mentioning

confidence: 99%

A 3D full‐field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions

Wigger

Lin²,

Lupton³

et al. 2019

Fatigue Fract Eng Mat Struct

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3D full--field deformation around crack tips in a nuclear graphite has been studied under mode I and mode II cyclic dwell loading conditions using Digital Volume Correlation (DVC) and integrated finite element (FE) analysis. A cracked Brazilian disk specimen of Gilsocarbon graphite was tested at selected loading angles to achieve mode I and mode II cyclic dwell loading conditions. Integrated FE analysis was carried out with the three--dimensional displacement fields measured by DVC injected into the FE model, from which the crack driving force J--integral was obtained using a damaged plasticity material model. The evolution of near--tip strains and the J--integral during the cyclic dwell loading was examined. Under cyclic dwell, residual strain accumulation was observed for the first time. The results shed some light on the effect of dwell time on the 3D crack deformation and crack driving force in Gilsocarbon under cyclic mode I and II loading conditions.

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“…Das Ermüdungsver-halten von feinkristallinem isotropem Graphit bei Wechselbiegebelastung und periodischer schlagartiger Belastung [7], sowie die Anwendbarkeit von linearen Schadensakkumulationsrechnungen auf Zweistufen-Ermüdungsversuche [8] ist ebenfalls in der Literatur beschrieben. Andere Untersuchungen beschäftigen sich mit dem Ermüdungsrisswachstum und der Vorhersage der Lebensdauer auf Basis von Rissausbreitungsdaten [9]. Fig.…”

Section: Introductionunclassified

Ermüdungsverhalten und Dauerfestigkeit von Graphit und Aluminium – infiltriertem Graphit

Papakyriacou¹,

Mayer²

2006

Mat.-wiss. u. Werkstofftech.

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cycles. The open porosity of Graphite (10-11 Vol.-%) was infiltrated with the aluminium alloy using the squeeze casting infiltration method, which led to an increase of the bending strength by 50 %, increase of tensile strength by 30 % and increase of stiffness by 15 %. Fully reversed tension-compression loading of FU2590 delivers a mean endurance limit at 10 9 cycles at the normalized maximum stresses (i.e. maximum tension stress of a cycle divided by the static strength) of 0,65AE0,03. Mean numbers of cycles to failure of 10 4 were found in fully reversed bending tests at the normalized maximum stress of 0,78. The infiltrated material shows approximately 30 % higher cyclic strength in reversed bending tests, and the mean endurance limit under tension compression loading increases by 15 %. The increased endurance limit of the infiltrated material is caused by the increased stiffness. The increased toughness of graphite due to the infiltration with aluminium is of additional beneficial influence at the higher cyclic stresses investigated in reversed bending tests and in static tests.

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Room temperature fatigue crack propagation in reactor graphites

Cited by 23 publications

References 15 publications

Fatigue behaviour of ATJ graphite

Fatigue behaviour of ATJ graphite

A 3D full‐field study of cracks in a nuclear graphite under mode I and mode II cyclic dwell loading conditions

Ermüdungsverhalten und Dauerfestigkeit von Graphit und Aluminium – infiltriertem Graphit

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