2017 International Nuclear Atlantic Conference - INAC 2017 Belo Horizonte, MG, Brazil, October 22-27, 2017 ASSOCIAÇÃO BRASILEIRA DE ENERGIA NUCLEAR – ABEN ISBN: 978-85-99141-06-9 ASSESSMENT OF FRACTURE TOUGHNESS OF STRUCTURAL STEELS José Onésimo Gomes Junyor 1 , Stéfanno Bruno Faria 2 , Nirlando Antônio Rocha 3 , Emil Reis 4 and Jefferson José Vilela 5 2 Universidade Federal de Minas Gerais (UFMG) Av. Avenida Antônio Carlos, 6627. 31270-901 Belo Horizonte, MG. [email protected] 3 Centro Universitário de Belo Horizonte (UNIBH). Av. Prof. Mário Werneck, 1685 - Estoril. 30455-610 – Belo Horizonte – MG [email protected] 3 Centro de Desenvolvimento da Tecnologia Nuclear (CDTN) Av. Avenida Antônio Carlos, 6627. 31270-901 Belo Horizonte, MG. [email protected] 4 Centro de Desenvolvimento da Tecnologia Nuclear (CDTN) Av. Avenida Antônio Carlos, 6627. 31270-901 Belo Horizonte, MG. [email protected] 5 Centro de Desenvolvimento da Tecnologia Nuclear (CDTN) Av. Avenida Antônio Carlos, 6627. 31270-901 Belo Horizonte, MG. [email protected] ABSTRACT The fracture toughness parameters are applied to estimate the lifetime of mechanical components and define the criteria of safe failure and tolerable damages. This information allows equipment to be used longer with a high degree of safety. These techniques are applied in the Leak-Before-Break (LBB) concept that is accepted for designing the piping system of the primary circuit of the pressurized water reactor (PWR). In this work, fracture toughness tests such as J IC and CTOD were performed on some structural steels. The fracture toughness parameters were determined using SE(B) and C(T) test specimens. The fracture toughness values for the same material varied according to the type specimen. The parameter δ 1c showed different values when it was calculated using the ASTM E1820 standard and using the BS 7448: Part 1 standard. These results indicate that procedures of these standards need to be improved. Two systems with different sensitivity in the force measurement were used that showed similar results for toughness fracture but the dispersion was different. Keywords: toughness, fracture, steel.
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