http://repositorio.ufc.br/handle/riufc/456 Mon, 06 Apr 2026 14:18:28 GMT 2026-04-06T14:18:28Z http://repositorio.ufc.br/handle/riufc/69360 Título: Cálculo dos parâmetros de fratura linear elástico baseado numa estratégia auto-adaptativa Autor(es): Araújo, Tereza Denyse Pereira de; Roehl, Deane de Mesquita; Martha, Luiz Fernando Campos Ramos; Bittencourt, Túlio Nogueira Abstract: Several finite element adaptive strategies are available for linear-elastic problems. However, few works deal with adaptive analysis of fracture problems1,2,3,4. This is due mainly to the singularity at crack tips. An efficient adaptive technique must be able to localize singularity regions, in addition to correctly define element sizes in these regions. The way the singularity is treated differs from author to author. Some2,4 incorporate the intensity of the singularity in the computation of the characteristic size of elements adjacent to the singularity region, while others3 clain that this is not necessary. In addition, in fracture problems, elements at the crack tip need to be sufficiently small to capture the existing singularity. Therefore, some requirements are imposed to the mesh generation algorithms such as to provide good mesh transition between regions of different element sizes and to avoid bad shaped elements at the crack tip. Previous work of the authors proposed mesh generation techniques for two-dimensional models with cracks5. This work describes the adopted adaptive strategy for linear-elastic fracture problems. This strategy is based on a type “h” refinement, with an ‘a posteriori’ error estimator, which is based on an energy norm4. To evaluate the proposed strategy, examples of numerical computation of fracture parameters are presented. Tipo: Artigo de Evento Sat, 01 Jan 2000 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/69360 2000-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/69316 Título: Estudo paramétrico por elementos finitos de lajes nervuradas devido às ações humanas Autor(es): Costa, Yuri Cláudio Vieira da; Araújo, Tereza Denyse Pereira de Tipo: Artigo de Evento Sat, 01 Jan 2011 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/69316 2011-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/69238 Título: Desempenho do concreto frente a adições de Spray Dryer Ash na usina termelétrica do Pecém Autor(es): Santana, Raphael Arlego de Alcântara; Cabral, Antonio Eduardo Bezerra Abstract: After the flue gases from a thermoelectric plant that uses coal as combustive passes through a dessulfurizator, the fly ashes get mixed with sulphurous products, hampering the use of this residue. A possible use for this ash, named spray dryer ash (SDA), is as a mineral addition to concrete. The objective of this paper is to evaluate the performance of concrete with addition of different percentages of spray dryer ash from Pecém's thermoelectric plant. Concrete specimens with 0%, 5%, 10% and 20% of SDA addition to the cement mass were cast and had its compressive strength measured. After that a sulfur attack was made to evaluate the volumetric change, a concern when working with sulfur-containing compounds in concrete. It is concluded that an addition of 20% of SDA can raise the compressive strength of concrete without worrying about sulfate attacks, while a 5% or a 10% addition behaves similar to a concrete without SDA. Tipo: Artigo de Evento Mon, 01 Jan 2018 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/69238 2018-01-01T00:00:00Z http://repositorio.ufc.br/handle/riufc/69235 Título: Avaliação da reatividade álcali-agregado de areias de britagem da região metropolitana de Fortaleza, Brasil Autor(es): Costa, Heloina Nogueira da; Menezes, Alexandre Jorge Rocha; Barreto, José Maurício Lima; Cabral, Antonio Eduardo Bezerra Tipo: Artigo de Evento Thu, 01 Jan 2015 00:00:00 GMT http://repositorio.ufc.br/handle/riufc/69235 2015-01-01T00:00:00Z