Título:	Modeling 2D surface to 1D through-crack transitions using 2D point load weight function
Autor(es):	Miranda, Antonio Carlos de Oliveira Antunes, Marcelo Avelar Meggiolaro, Marco Antonio Castro, Jaime Tupiassú Pinho de
ORCID:	https://orcid.org/0000-0002-5225-7428 https://orcid.org/0000-0003-0247-9812
Assunto:	Materiais - fadiga Função de peso de carga pontual Rachadura
Data de publicação:	Set-2018
Referência:	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).
Unidade Acadêmica:	Faculdade de Tecnologia (FT) Departamento de Engenharia Civil e Ambiental (FT ENC)
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.
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