ITEC - Instituto de Tecnologia

URI Permanente desta comunidadehttps://repositorio.ufpa.br/handle/2011/25

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Agora exibindo 1 - 6 de 6

Acesso aberto (Open Access)
Economia circular e práticas sustentáveis: um estudo de caso em uma empresa da movelaria paraense
(Universidade da Amazônia, 2021-11) LIMA, Fernanda Costa de; MARTINS, Cyntia Meireles; PIRES, Gilson Scholl; BOTELHO, Carla Raíssa Viégas
Acesso aberto (Open Access)
Experimental analysis of the efficiency of steel fibers on shear strength of beams
(Associação Brasileira de Ciências Mecânicas, 2016-07) GOMES, Lana Daniele dos Santos; OLIVEIRA, Dênio Ramam Carvalho de; MORAES NETO, Bernardo Nunes de; MEDEIROS, Adelson Bezerra de; MACÊDO, Alcebíades Negrão
The efficiency of steel fibers for shear strength of reinforced concrete beams is assessed. Four beams were evaluated: control consisted of one beam without any steel fibers and three beams with reinforced concrete with steel fibers. All beams were reinforced for shear strength by a minimum reinforcement rate. The influence of fiber content added to concrete, at 0.5%, 0.8% and 1.0%, and the possibility of partial or total replacement of conventional shear reinforcement (stirrups) by steel fibers were evaluated. Results showed a significant increase in ductility and stiffness of the beams with steel fibers and, consequently, changes in the failure mode were observed, of shear (control beam) to flexure behavior (beams with steel fibers).
Acesso aberto (Open Access)
Fracture modes of AISI type 302 stainless steel under metastable plastic deformation
(Associação Brasileira de Metalurgia e Materiais, 2017-11) SANTOS, Jheison Lopes dos; MONTEIRO, Sergio Neves; CÂNDIDO, Veronica Scarpini; SILVA, Anderson Oliveira da; RAMOS, Flávio James Humberto Tommasini Vieira
Martensitic transformation can be induced by plastic deformation in metastable iron-based alloys, such as stainless steels containing limited amounts of C, Ni and Cr. This transformation takes place at the temperature range from Ms and Md, usually at relatively lower temperature values. The transformed martensite has been associated with maximum ultimate strength and relatively high ductility. In the present work, the tensile fracture characteristics of a metastable AISI type 302 stainless steel was properties were compared to those of a stable AISI type 310 austenitic stainless steel. It was found that in 302 steel, its high degree of metastability and dilute dispersion of inclusions result in higher strength and complex modes of fracture, one of which consisting of martensite surrounding globular inclusions.
Acesso aberto (Open Access)
Identificação de patologias em fachadas e metodologia de análise: estudos de casos na Universidade Federal do Pará
(Universidade Federal do Pará, 2014-10) CARVALHO, Isabella Chaves; PICANÇO, Marcelo de Souza; MACÊDO, Alcebíades Negrão
The system of external cladding of the building acts as a protective layer and contributes to the proper aspect. The facade is subject to the action of agents of degradation as one of the most exposed areas of the building, with the presence of pathology becoming responsible for high repair costs. Research suggests as a goal, a survey on of buildings facades in the Federal University of Pará, to acquire grants to run future interventions in public facilities from the identification of the main problems present in the case studies. Started the development of evaluation methods to identify the damage with a standardized manner from the document production that facilitate visual inspections with obtaining information from damage. From the result of the identification of pathologies in facades with their respective methods of analysis, was expected to contribute to the increase in procedures that seek technical and economic performance of façades as a whole, assisting in future maintenance of the buildings in question, as well as production of reference source for other ventures.
Acesso aberto (Open Access)
Influência dos procedimentos e modos de transferência no processo MAG na redução de deformações em painéis de estruturas navais
(Associação Brasileira de Soldagem, 2013-11) CABRAL, Tarcio dos Santos; BRAGA, Eduardo de Magalhães; MENDONÇA, Everton Augusto Maciel; SCOTTI, Américo
The Growth in the Brazilian shipbuilding industry brought on numerous problems in the production line. Some of these problems are related to the manufacturing process, welding process, due to residual stress and distortions. In the present paper, the influence of the welding procedure (sequence and direction of welding and the use of back weld) was studied. Different welding processes with different transfer modes (GMAW-CC, GMAW-TT and GMAW-CW) were also used. These changes were made to observe the influences on the amplitude of the distortions. All the welds were made using the ER70S-6 electrode and pure CO2 as a shielding gas with the short circuit transfer mode. The results showed that the most important variable is the direction of welding, which is related to the level of restriction of the panels welded. The effect of the welding sequence presented on the values of distortion produced were minor. The panels produced using the back welding procedure presented small values of distortion however, the procedure showed to be inefficient. It was also observed that the level of distortion for the processes GMAW-CC and GMAW-STT showed similar values. On the other hand the values of distortion in the panel welded using the GMAW-CW process presented the lowest values.
Acesso aberto (Open Access)
Processing and characterization of extruded breakfast meal formulated with broken rice and bean flour
(2012-09) CARVALHO, Ana Vânia; MATTIETTO, Rafaella de Andrade; BASSINELLO, Priscila Zaczuk; KOAKUZU, Selma Nakamoto; RIOS, Alessandro de Oliveira; MACIEL, Renan de Almeida; CARVALHO, Rosângela Nunes
The objective of this work was to develop an extruded breakfast product containing broken rice and split old beans and to verify the influence of the extrusion process on their physicochemical, technological, and sensory characteristic. The final product had a protein content of 9.9 g.100 g-1, and therefore it can be considered a good source of proteins for children and teenagers. The dietary fiber content of the final edible product was 3.71 g.100 g-1. Therefore, the breakfast meal may be considered as a source of dietary fiber according to Brazilian law . As for the technological properties, the extruded product presented an expansion index of 8.89 and apparent density of 0.25 g.cm-3. With regard to the sensory analysis, the acceptance average was ranked between 6.8 and 7.7, corresponding to the categories "liked slightly" and "liked very much". With regard to purchase intention, 79% of the panelists said they would certainly or possibly purchase the product. Broken rice and split old beans are interesting alternatives for the elaboration of extruded breakfast products presenting good nutritional, technological, and sensory qualities.

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