Crack Initiation Under Equibiaxial Fatigue, Development of a Particular Equibiaxial Fatigue Device

Bradaï, S.; Gourdin, C.; Courtin, S.; Leroux, Jean‐Christophe; Gardin, C.

doi:10.1115/pvp2013-97200

Cited by 8 publications

(7 citation statements)

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“…In the NUREG/CR-6909, the values chosen for the cyclic yield strength and the ultimate tensile strength are respectively of 303.4 MPa and 648.1 MPa. These values are very high compared to the same Manchester, United Kingdom - August 10-14, 2015 Division IX material properties of RCC-M austenitic stainless steels: the maximum cyclic yield strength was found to be of 250 MPa whereas the maximum ultimate tensile strength around 600 MPa. When applying the modified Goodman correction with these values, it appears that the modified Goodman correction has no effect for alternating stresses higher than the S alt at 10 6 cycles (177 MPa).…”

Section: Mean Stressmentioning

confidence: 65%

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Overview of French Proposal of Updated Austenitic SS Fatigue Curves and of a Methodology to Account for EAF

Métais

Courtin

Genette

et al. 2015

Volume 1A: Codes and Standards

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Environmentally Assisted Fatigue is receiving nowadays an increased level of attention not only for new builds but also for the installed bases which are currently having their lives extended to 60 years in various countries. To formally integrate these effects, some international codes have already proposed code cases. More specifically, the ASME code has used the NUREG/CR-6909 [1] as the basis for Code Case N-792 [2] and suggests a modification of the austenitic stainless steels fatigue curve combined with a calculation of an environmental penalty factor, namely Fen, which is to be multiplied by the usual fatigue usage factor. The various methodologies proposed are not finalized and there is still a significant level of discussion as can be illustrated by the recent update of NUREG/CR-6909 [3]. In this context, EDF, AREVA and the CEA have also submitted two RCC-M Rules in Probatory Phase (RPP) (equivalent to ASME code-cases) to AFCEN to propose respectively an update of the fatigue curve for austenitic stainless steels and a methodology to incorporate EAF in fatigue evaluations. The approach is globally similar to the one in the ASME code: it consists in an update of the mean air and design fatigue curves as well as the calculation of an environmental penalty factor. Nevertheless, the methodologies differ in their detailed implementation by especially introducing the Fen-integrated which accounts for the environmental effects already covered by the fatigue curves. This paper is the sequel to the proposal already described in [4] [6].

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Section: Mean Stressmentioning

confidence: 65%

“…Nevertheless, as this point in time, the French experimental efforts have been focusing, and will continue to focus in the near future, on 304L/316L austenitic stainless steels nuclear grades. Manchester, United Kingdom - August 10-14, 2015 Division IX…”

Section: Scope Of Applicability Of the Rulesmentioning

confidence: 99%

Overview of French Proposal of Updated Austenitic SS Fatigue Curves and of a Methodology to Account for EAF

Métais

Courtin

Genette

et al. 2015

Volume 1A: Codes and Standards

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“…Two experimental calibration methods have been carried out in the LISN laboratory with the FABIME2 device. Specimens used are in stainless austenitic steel type 316L [8].…”

Section: Calibrationmentioning

confidence: 99%

Equi-biaxial loading effect on austenitic stainless steel fatigue life

Gourdin¹,

Bradaï²,

Courtin³

et al. 2016

Frattura Ed Integrità Strutturale

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Fatigue lifetime assessment is essential in the design of structures. Under-estimated predictions may result in unnecessary in service inspections. Conversely, over-estimated predictions may have serious consequences on the integrity of structures. In some nuclear power plant components, the fatigue loading may be equibiaxial because of thermal fatigue. So the potential impact of multiaxial loading on the fatigue life of components is a major concern. Meanwhile, few experimental data are available on austenitic stainless steels. It is essential to improve the fatigue assessment methodologies to take into account the potential equi-biaxial fatigue damage. Hence this requires obtaining experimental data on the considered material with a strain tensor in equibiaxial tension. Two calibration tests (with strain gauges and image correlation) were used to obtain the relationship between the imposed deflection and the radial strain on the FABIME2 specimen. A numerical study has confirmed this relationship. Biaxial fatigue tests are carried out on two austenitic stainless steels for different values of the maximum deflection, and with a load ratio equal to -1. The interpretation of the experimental results requires the use of an appropriate definition of strain equivalent. In nuclear industry, two kinds of definition are used: von Mises and TRESCA strain equivalent. These results have permitted to estimate the impact of the equibiaxiality on the fatigue life of components.

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“…Unfortunately, there is no sufficient experimental data available concerning fatigue strength for the austenitic stainless steels subjected to structural loadings [7][8][9][10][11], which are used for power plants components. In order to obtain fatigue strength data under structural loading, biaxial test means with and without PWR environment were developed at LISN [12][13][14].…”

Section: Introduction and Aimmentioning

confidence: 99%

PWR effect on crack initiation under equi-biaxial loading development of the experiment

Gourdin

Dhahri

Courtin³

et al. 2019

Mechanics & Industry

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The lifetime extension of the nuclear power stations is considered as an energy challenge worldwide. That is why, the risk analysis and the study of various effects of different factors that could potentially represent a hazard to a safe long term operation are necessary. The methodology for fatigue dimensions of the Pressurized Water Reactor components (PWR) is based on the use of design curves established from test carried out in air at 20°C on smooth specimens by integrating safety coefficient that covers the dispersion of tests associated with the effects of structures. To formally integrate these effects, some international codes have already proposed and suggested a modification of the austenitic stainless steels fatigue curve combined with a calculation of an environmental penalty factor, namely Fen, which has to be multiplied by the usual fatigue usage factor. The aim of this paper is to present a new device "FABIME2E" developed in the CEA-LISN in collaboration with EDF and AREVA. These new tests allow quantifying accurately the effect of PWR environment on semi-structure specimen. This new device combines the structural effect like equi-biaxiality and mean strain and the environmental penalty effect with the use of PWR environment during the fatigue tests.

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Crack Initiation Under Equibiaxial Fatigue, Development of a Particular Equibiaxial Fatigue Device

Cited by 8 publications

References 0 publications

Overview of French Proposal of Updated Austenitic SS Fatigue Curves and of a Methodology to Account for EAF

Overview of French Proposal of Updated Austenitic SS Fatigue Curves and of a Methodology to Account for EAF

Equi-biaxial loading effect on austenitic stainless steel fatigue life

PWR effect on crack initiation under equi-biaxial loading development of the experiment

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