A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels

Diego Sarzosa; Rafael Savioli; Claudio Ruggieri; Andrey Jivkov; Jack Beswick

doi:10.1115/pvp2018-85063

A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels

Diego Sarzosa, Rafael Savioli, Claudio Ruggieri, Andrey Jivkov, Jack Beswick

University of Sao Paulo

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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Abstract

This work presents recent improvements in the microme- chanical failure citeria based on the Weibull stress (σw) concept for prediction of cleavage fracture in ferritic steels. The model is applied in SE(B) specimens extracted from an ASTM A533 pressure vessel steel having different levels of stress triaxiality at the crack tip. Nonlinear 3D finite element models with dimen- sions matching the tested specimens were built to provide the necessary crack tip stresses at the fracture process zone for cal- culation of σw-J evolution from wich the variation of character- istic toughness value (J0) between different cracked geometries can be estimated. The application of this methodology for the material used at this study is able to predict J0 for SE(B) speci- mens with very shallow crack size ratio a/W = 0.05, short crack a/W = 0.2 and deep crack a/W = 0.4. The reported fracture toughness values, for specimens having very shallow crack size ratio, is an additional contribution of this study.

Original language	English
Title of host publication	Materials and Fabrication
Subtitle of host publication	Proceedings of the ASME 2018 Pressure Vessels and Piping Conference
Publisher	American Society of Mechanical Engineers
Number of pages	10
ISBN (Electronic)	9780791851685
DOIs	https://doi.org/10.1115/pvp2018-85063
Publication status	Published - 2018

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10.1115/pvp2018-85063

asme2e_draft2018Accepted author manuscript, 3.58 MBLicence: Unspecified

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Sarzosa, D., Savioli, R., Ruggieri, C., Jivkov, A., & Beswick, J. (2018). A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels. In Materials and Fabrication: Proceedings of the ASME 2018 Pressure Vessels and Piping Conference Article PVP2018-85063 American Society of Mechanical Engineers. https://doi.org/10.1115/pvp2018-85063

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title = "A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels",

abstract = "This work presents recent improvements in the microme- chanical failure citeria based on the Weibull stress (σw) concept for prediction of cleavage fracture in ferritic steels. The model is applied in SE(B) specimens extracted from an ASTM A533 pressure vessel steel having different levels of stress triaxiality at the crack tip. Nonlinear 3D finite element models with dimen- sions matching the tested specimens were built to provide the necessary crack tip stresses at the fracture process zone for cal- culation of σw-J evolution from wich the variation of character- istic toughness value (J0) between different cracked geometries can be estimated. The application of this methodology for the material used at this study is able to predict J0 for SE(B) speci- mens with very shallow crack size ratio a/W = 0.05, short crack a/W = 0.2 and deep crack a/W = 0.4. The reported fracture toughness values, for specimens having very shallow crack size ratio, is an additional contribution of this study.",

author = "Diego Sarzosa and Rafael Savioli and Claudio Ruggieri and Andrey Jivkov and Jack Beswick",

note = "Funding Information: This investigation is supported by the Royal Academy of Engineering throught the Newton Research Collaborative Program signed between University of Manchester (UK) and University of S{\~a}o Paulo (Brazil). The work of CR is also supported by Fun-da{\c c}{\~a}o de Amparo {\`a} Pesquisa do Estado de S{\~a}o Paulo (FAPESP) through research grant 2016/260241-1 and the Brazilian Council for Scientific and Technological Development (CNPq) through grant 306193/2013-2. Publisher Copyright: Copyright {\textcopyright} 2018 ASME.",

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Sarzosa, D, Savioli, R, Ruggieri, C, Jivkov, A & Beswick, J 2018, A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels. in Materials and Fabrication: Proceedings of the ASME 2018 Pressure Vessels and Piping Conference., PVP2018-85063, American Society of Mechanical Engineers. https://doi.org/10.1115/pvp2018-85063

A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels. / Sarzosa, Diego; Savioli, Rafael; Ruggieri, Claudio et al.
Materials and Fabrication: Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2018. PVP2018-85063.

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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AU - Beswick, Jack

N1 - Funding Information: This investigation is supported by the Royal Academy of Engineering throught the Newton Research Collaborative Program signed between University of Manchester (UK) and University of São Paulo (Brazil). The work of CR is also supported by Fun-dação de Amparo à Pesquisa do Estado de São Paulo (FAPESP) through research grant 2016/260241-1 and the Brazilian Council for Scientific and Technological Development (CNPq) through grant 306193/2013-2. Publisher Copyright: Copyright © 2018 ASME.

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N2 - This work presents recent improvements in the microme- chanical failure citeria based on the Weibull stress (σw) concept for prediction of cleavage fracture in ferritic steels. The model is applied in SE(B) specimens extracted from an ASTM A533 pressure vessel steel having different levels of stress triaxiality at the crack tip. Nonlinear 3D finite element models with dimen- sions matching the tested specimens were built to provide the necessary crack tip stresses at the fracture process zone for cal- culation of σw-J evolution from wich the variation of character- istic toughness value (J0) between different cracked geometries can be estimated. The application of this methodology for the material used at this study is able to predict J0 for SE(B) speci- mens with very shallow crack size ratio a/W = 0.05, short crack a/W = 0.2 and deep crack a/W = 0.4. The reported fracture toughness values, for specimens having very shallow crack size ratio, is an additional contribution of this study.

AB - This work presents recent improvements in the microme- chanical failure citeria based on the Weibull stress (σw) concept for prediction of cleavage fracture in ferritic steels. The model is applied in SE(B) specimens extracted from an ASTM A533 pressure vessel steel having different levels of stress triaxiality at the crack tip. Nonlinear 3D finite element models with dimen- sions matching the tested specimens were built to provide the necessary crack tip stresses at the fracture process zone for cal- culation of σw-J evolution from wich the variation of character- istic toughness value (J0) between different cracked geometries can be estimated. The application of this methodology for the material used at this study is able to predict J0 for SE(B) speci- mens with very shallow crack size ratio a/W = 0.05, short crack a/W = 0.2 and deep crack a/W = 0.4. The reported fracture toughness values, for specimens having very shallow crack size ratio, is an additional contribution of this study.

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PB - American Society of Mechanical Engineers

ER -

Sarzosa D, Savioli R, Ruggieri C, Jivkov A, Beswick J. A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels. In Materials and Fabrication: Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers. 2018. PVP2018-85063 Epub 2018 Jul 15. doi: 10.1115/pvp2018-85063

A local approach to assess effects of specimen geometry on cleavage fracture toughness in reactor pressure vessel steels

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