This work presents recent improvements in the micromechanical failure criterion 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 dimensions matching the tested specimens were built to provide the necessary crack tip stresses at the fracture process zone for calculation of the σw-J evolution from wich the variation of characteristic toughness values (J0) between different cracked geometries can be estimated. Application of this methodology for the material used at this study is able to predict J0 for SE(B) specimens 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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ASME 2018 Pressure Vessels and Piping Conference
July 15–20, 2018
Prague, Czech Republic
Conference Sponsors:
- Pressure Vessels and Piping Division
ISBN:
978-0-7918-5168-5
PROCEEDINGS PAPER
A Local Approach to Assess Effects of Specimen Geometry on Cleavage Fracture Toughness in Reactor Pressure Vessel Steels
Diego F. B. Sarzosa,
Diego F. B. Sarzosa
University of São Paulo, São Paulo, Brazil
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Rafael Savioli,
Rafael Savioli
University of São Paulo, São Paulo, Brazil
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Claudio Ruggieri,
Claudio Ruggieri
University of São Paulo, São Paulo, Brazil
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Andrey Jivkov,
Andrey Jivkov
University of Manchester, Manchester, UK
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Jack Beswick
Jack Beswick
University of Manchester, Manchester, UK
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Diego F. B. Sarzosa
University of São Paulo, São Paulo, Brazil
Rafael Savioli
University of São Paulo, São Paulo, Brazil
Claudio Ruggieri
University of São Paulo, São Paulo, Brazil
Andrey Jivkov
University of Manchester, Manchester, UK
Jack Beswick
University of Manchester, Manchester, UK
Paper No:
PVP2018-85063, V06BT06A048; 10 pages
Published Online:
October 26, 2018
Citation
Sarzosa, DFB, 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." Proceedings of the ASME 2018 Pressure Vessels and Piping Conference. Volume 6B: Materials and Fabrication. Prague, Czech Republic. July 15–20, 2018. V06BT06A048. ASME. https://doi.org/10.1115/PVP2018-85063
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