PSI - Issue 17

Available online at www.sciencedirect.com Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000 Available online at www.sciencedirect.com ScienceDirect Structural Integrity Procedia 00 (2019) 000 – 000

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ScienceDirect

Procedia Structural Integrity 17 (2019) 479–486

ICSI 2019 The 3rd International Conference on Structural Integrity Compatibility of fracture toughness results in the upper shelf region Pavel Konopik a* , Martin Rund a , Sylwia Rzepa a , Jan Dzugan a , Daniel Melzer a * a COMTES FHT a.s., Průmyslová 955, 3 34 41 Dobřany, Czech Republic ICSI 2019 The 3rd International Conference on Structural Integrity Compatibility of fracture toughness results in the upper shelf region Pavel Konopik a* , Martin Rund a , Sylwia Rzepa a , Jan Dzugan a , Daniel Melzer a * a COMTES FHT a.s., Průmyslová 955, 3 34 41 Dobřany, Czech Republic

Abstract Abstract

Fracture toughness has been used for decades nowadays for structure integrity assessment and it is important mechanical characteristic for new materials as well. In the upper shelf region, where stable fracture behavior is observed, concept of J-R curve is widely apply to determine fracture toughness parameter JIc defined by the intersection of the 0.2 mm offset construction line and the J-R curve according to ASTM E1820. Fracture mechanic methods have been well established in the community especially for standard sized specimens but as it was mainly developed for large structures assessment against the brittle failure, standardized specimens are of large size at present. In many cases, such as evaluation of additively manufactured products properties, residual life of in-service components, local properties of components, weld joint, etc., standard specimens are not possible to use due to size requirements. Therefore, small sized specimens are necessary to use for material characterization. Due to constraint effect, the results obtained from standard and small sized specimens may be different. In the current paper, fracture toughness properties are going to be investigated using different sized samples scaled from mini-Charpy or mini-CT specimens to the standard one. Based on experimental results from several structural metals like steels 34CrNiMo6 and 27NiCrMoV 15-6, a procedure leading to the comparable results from small to standard samples will be proposed. Fr ctur toughness has been used for decades nowadays f r structure integrity assessment and it is important mechanical characteristic for new materials as w ll. In the up er shelf region, where stable fracture behavior is observed, con ept of J-R curv is wid ly apply to determine fracture toughness paramet r JIc defined by the intersection of the 0.2 mm offset co struction line and the J-R curve according to ASTM E1820. Fracture mechanic methods have been well established in the community especially for standard sized specimens but as it was ainly d veloped for l rge structures assessment against the brittle failure, standardized sp cimens are of large size at present. In many cases, such as evaluatio of additively manufactured products properties, residual life of in-s rvice components, local properties of components, weld joint, etc., standard specimens are not possible to use due to size requirem nts. Therefore, small sized specimens ar necessary to use for material characterization. Due to constraint effect, th results btained from standard and small sized specimens may be different. In the current paper, fracture toughness properties are going to be i vestigated using different sized sa ples scaled from mini-Charpy or mini- T specimens to the standard one. Based on experimental results from sever l structural metals like steels 34CrNiMo6 and 27NiCrMoV 15-6, a procedure leading to the comparable results from small to standard samples will be proposed.

© 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

Keywords: Small Punch test; facture toughness; Micro-Tensile test; Mini-Charpy test Keywords: Small Punch test; facture toughness; Micro-Tensile test; Mini-Charpy test

* Corresponding author. Tel.: +420-723-883-915; fax: +420 377 197 310 E-mail address: pavel.konopik@comtesfht.cz * Correspon ing author. Tel.: +420-723-883-915; fax: +420 377 197 310 E-mail address: pavel.konopik@comtesfht.cz

2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 2452-3216 © 2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers.

2452-3216  2019 The Authors. Published by Elsevier B.V. Peer-review under responsibility of the ICSI 2019 organizers. 10.1016/j.prostr.2019.08.063