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Title: Modeling 2D surface to 1D through-crack transitions using 2D point load weight function
Authors: Miranda, Antonio Carlos de Oliveira
Antunes, Marcelo Avelar
Meggiolaro, Marco Antonio
Castro, Jaime Tupiassú Pinho de
Assunto:: Materiais - fadiga
Função de peso de carga pontual
Issue Date: Sep-2018
Citation: MIRANDA, Antonio Carlos de Oliveira et al. Modeling 2D surface to 1D through-crack transitions using 2D point load weight function. In: INTERNATIONAL CONFERENCE ON CRACK PATHS, 6., 2018, Verona, Italy.
Abstract: Part-through surface or corner 2D cracks are commonly found in structural components. To model them assuming that the shape of their fronts is approximately elliptic is a quite reasonable hypothesis supported by fractographic observations, but their transition to a 1D through-crack normally is not properly addressed in fatigue life predictions. Although experimental data reveal that the frontier of 2D superficial cracks essentially retain their elliptical shape as they gradually grow into a through-crack, it is usual to assume they are immediately transformed into a 1D through-crack when their depth reaches the cracked component thickness. This oversimplified approximation may create a large jump in stress intensity values, leading to excessively conservative fatigue crack growth predictions, or else the crude shape jump hypothesis may induce false overload events that can much affect fatigue crack growth retardation models, leading to inadmissible non-conservative life predictions. To minimize such problems, a crack propagation strategy, based on a point load weight function, is proposed and verified by 2D crack propagation tests in two different materials, 4340 steel and polycarbonate (PC).
Licença:: Autorização concedida ao Repositório Institucional da Universidade de Brasília (RIUnB) pelo Prof. Dr. Antonio Carlos de Oliveira Miranda, em 28 de setembro de 2018, para disponibilizar o trabalho, gratuitamente, para fins de leitura, impressão e/ou download, a título de divulgação da obra.
Appears in Collections:ENC - Trabalhos apresentados em eventos

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