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A local approach to cleavage fracture modeling: An overview of progress and challenges for engineering applications

Texto completo
Ruggieri, Claudio [1] ; Dodds, Jr., Robert H. [2]
Número total de Autores: 2
Afiliação do(s) autor(es):
[1] Univ Sao Paulo, Dept Naval Architecture & Ocean Engn, Sao Paulo - Brazil
[2] Univ Illinois, Dept Civil & Environm Engn, Urbana, IL 61801 - USA
Número total de Afiliações: 2
Tipo de documento: Artigo de Revisão
Fonte: ENGINEERING FRACTURE MECHANICS; v. 187, n. SI, p. 381-403, JAN 2018.
Citações Web of Science: 2

This paper provides an overview of recent progress in probabilistic modeling of cleavage fracture phrased in terms of a local approach to fracture (LAF) and the Weibull stress concept. Emphasis is placed on the incorporation of plastic strain effects into the probabilistic framework by approaching the strong influence of constraint variations on (macroscopic) cleavage fracture toughness in terms of the number of eligible Griffith-like microcracks which effectively control unstable crack propagation by cleavage. Some recent results based on a modified Weibull stress model to predict specimen geometry effects on Jc-values for pressure vessel grade steels are summarized in connection with an engineering procedure to calibrate the Weibull stress parameters. These results are compared against corresponding fracture toughness predictions derived from application of the standard Beremin model. Finally, the robustness of LAF methodologies, including specifically the Weibull stress approach, is critically examined along with a discussion of key issues and challenges related to engineering applications in fracture assessments of structural components. (C) 2017 Elsevier Ltd. All rights reserved. (AU)

Processo FAPESP: 16/26024-1 - Modelagem multiescala da fratura frágil aplicada à avaliação da integridade estrutural utilizando corpos de prova miniaturizados
Beneficiário:Claudio Ruggieri
Linha de fomento: Auxílio à Pesquisa - Regular