Equi-biaxial loading effect on austenitic stainless steel fatigue life
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 fatigu...
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Gruppo Italiano Frattura
2016-10-01
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| Series: | Fracture and Structural Integrity |
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| Online Access: | http://www.gruppofrattura.it/pdf/rivista/numero38/numero_38_art_23.pdf |
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| author | C. Gourdin S. Bradaï S. Courtin J.C. Le Roux C. Gardin |
| author_facet | C. Gourdin S. Bradaï S. Courtin J.C. Le Roux C. Gardin |
| author_sort | C. Gourdin |
| collection | DOAJ |
| description | 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 |
| format | Article |
| id | doaj-art-181e8c7bde894b1d916c8eca2ae896c5 |
| institution | DOAJ |
| issn | 1971-8993 1971-8993 |
| language | English |
| publishDate | 2016-10-01 |
| publisher | Gruppo Italiano Frattura |
| record_format | Article |
| series | Fracture and Structural Integrity |
| spelling | doaj-art-181e8c7bde894b1d916c8eca2ae896c52025-08-20T02:51:42ZengGruppo Italiano FratturaFracture and Structural Integrity1971-89931971-89932016-10-01103817017610.3221/IGF-ESIS.38.23 Equi-biaxial loading effect on austenitic stainless steel fatigue lifeC. Gourdin 0S. Bradaï1S. Courtin 2J.C. Le Roux 3C. Gardin 4CEA, DEN, DM2S, SEMT, LISN, F-91191 Gif-sur-Yvette, FranceAREVA NP SAS, Tour AREVA, F-92084 Paris La Défense, FranceAREVA NP SAS, Tour AREVA, F-92084 Paris La Défense, FranceEDF, R&D, Site des Renardières, F-77818 Moret sur Loing Cedex, FranceInstitut Pprime,FranceFatigue 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 componentshttp://www.gruppofrattura.it/pdf/rivista/numero38/numero_38_art_23.pdfDesign fatigue curveEquibiaxialityExperimental deviceAustenitic steel |
| spellingShingle | C. Gourdin S. Bradaï S. Courtin J.C. Le Roux C. Gardin Equi-biaxial loading effect on austenitic stainless steel fatigue life Fracture and Structural Integrity Design fatigue curve Equibiaxiality Experimental device Austenitic steel |
| title | Equi-biaxial loading effect on austenitic stainless steel fatigue life |
| title_full | Equi-biaxial loading effect on austenitic stainless steel fatigue life |
| title_fullStr | Equi-biaxial loading effect on austenitic stainless steel fatigue life |
| title_full_unstemmed | Equi-biaxial loading effect on austenitic stainless steel fatigue life |
| title_short | Equi-biaxial loading effect on austenitic stainless steel fatigue life |
| title_sort | equi biaxial loading effect on austenitic stainless steel fatigue life |
| topic | Design fatigue curve Equibiaxiality Experimental device Austenitic steel |
| url | http://www.gruppofrattura.it/pdf/rivista/numero38/numero_38_art_23.pdf |
| work_keys_str_mv | AT cgourdin equibiaxialloadingeffectonausteniticstainlesssteelfatiguelife AT sbradai equibiaxialloadingeffectonausteniticstainlesssteelfatiguelife AT scourtin equibiaxialloadingeffectonausteniticstainlesssteelfatiguelife AT jcleroux equibiaxialloadingeffectonausteniticstainlesssteelfatiguelife AT cgardin equibiaxialloadingeffectonausteniticstainlesssteelfatiguelife |