PSI - Issue 59

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2023) 000 – 000

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ScienceDirect

Procedia Structural Integrity 59 (2024) 50–57

© 2024 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers Abstract In this work, techniques for fatigue cracks growing and fracture toughness tests were developed using miniature CT specimens (0.16T), side-grooved CT specimens ( 0.5Т) , 0.5T C(T) and 1T C(T). The specimens were cut from a forging made of 15Kh2NMFA steel. Based on the test results, fracture diagrams were obtained and a Master Curve was constructed for each group of specimens. The test results were used to determine the influence of the scale factor and the crack tip constraint on the fracture toughness. Numerical modeling of crack propagation processes in different CT specimen types was carried out using extended finite element method (XFEM). The fracture criterion parameters for steel 15Kh2NMFA were determined, and the influence of constraint in the crack tip for different specimens on the peculiarities of crack propagation kinetics was investigated. © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Experimental and calculation methods for fracture toughness estimation using different types of CT specimens Eugene Kondryakov*, Andriy Kravchuk, Valeriy Kharchenko, Pavlo Bulakh Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Ukraine, 2 Sadovo-Botanichna str., Kyiv-014, 01014, Ukraine Abstract In this work, techniques for fatigue cracks growing and fracture toughness tests were developed using miniature CT specimens (0.16T), side-grooved CT specimens ( 0.5Т) , 0.5T C(T) and 1T C(T). The specimens were cut from a forging made of 15Kh2NMFA steel. Based on the test results, fracture diagrams were obtained and a Master Curve was constructed for each group of specimens. The test results were used to determine the influence of the scale factor and the crack tip constraint on the fracture toughness. Numerical modeling of crack propagation processes in different CT specimen types was carried out using extended finite element method (XFEM). The fracture criterion parameters for steel 15Kh2NMFA were determined, and the influence of constraint in the crack tip for different specimens on the peculiarities of crack propagation kinetics was investigated. VII International Conference “In -service Damage of Materials: Diagnostics and Prediction ” (DMDP 2023) Experimental and calculation methods for fracture toughness estimation using different types of CT specimens Eugene Kondryakov*, Andriy Kravchuk, Valeriy Kharchenko, Pavlo Bulakh Pisarenko Institute for Problems of Strength, National Academy of Sciences of Ukraine, Ukraine, 2 Sadovo-Botanichna str., Kyiv-014, 01014, Ukraine

Keywords: Fracture toughness, Reactor pressure vessel steels, Miniature C(T) specimen Keywords: Fracture toughness, Reactor pressure vessel steels, Miniature C(T) specimen

1. Introduction The reactor pressure vessel (RPV) is the most critical element of the nuclear power plant (NPP) 1st circuit equipment; therefore, special attention is paid to the development of methods for estimating its strength and 1. Introduction The reactor pressure vessel (RPV) is the most critical element of the nuclear power plant (NPP) 1st circuit equipment; therefore, special attention is paid to the development of methods for estimating its strength and

* Corresponding author. Tel.: +38 068 1973968. E-mail address: kondryakov@ipp.kiev.ua * Corresponding author. Tel.: +38 068 1973968. E-mail address: kondryakov@ipp.kiev.ua

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers

2452-3216 © 2024 The Authors. Published by ELSEVIER B.V. This is an open access article under the CC BY-NC-ND license (https://creativecommons.org/licenses/by-nc-nd/4.0) Peer-review under responsibility of DMDP 2023 Organizers 10.1016/j.prostr.2024.04.009