Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica最新文献

ESTUDANTES DE COLABORADORES, VOLUNTÁRIOS E PARFOR (LABORATÓRIO ATUANDO COMO MULTIUSUÁRIO) 合作者、志愿者和PARFOR(多用户实验室)的学生

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910068

Denílson Elias Lima Silva, C. Costa

引用次数: 0

TESE DE DOUTORADO

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910066

Sebastião Botto de Barros Tojal, Fabricio Contato, Lopes Resende, Sebastião Botto de Barros, Paulo Resende, Fabricio Contato Lopes, Folha DE Avaliação, Fabricio Contato Lopes Resende, Maria Paula Dallari, Nina Beatriz Stocco Ranieri, Carlos Alberto de Salles, Susana Henriques da Costa, Maria Tereza Sadek, Paulo Márcio da Silva

{"title":"TESE DE DOUTORADO","authors":"Sebastião Botto de Barros Tojal, Fabricio Contato, Lopes Resende, Sebastião Botto de Barros, Paulo Resende, Fabricio Contato Lopes, Folha DE Avaliação, Fabricio Contato Lopes Resende, Maria Paula Dallari, Nina Beatriz Stocco Ranieri, Carlos Alberto de Salles, Susana Henriques da Costa, Maria Tereza Sadek, Paulo Márcio da Silva","doi":"10.22533/at.ed.8591910066","DOIUrl":"https://doi.org/10.22533/at.ed.8591910066","url":null,"abstract":"The ECAP technique is a severe plastic deformation process in which a billet is forced to flow under a simple shear condition through a die composed of identical channels that are intercepted at an angle Φ. The literature presents a great number of studies related to this technique. However, they are restricted to the exploration of results from specific set of parameters. In this context, the present work is destined to include work-hardening and strain-rate dependent materials in the upper-bound solutions proposed by Pérez and Luri to estimate the pressing force/pressure and the effective plastic strains. These solutions are associated to single pass of pressing at room temperature. At the same time, the finite element method was applied for the development of two-dimensional (2D) and threedimensional (3D) models that are able to provide accurate predictions of pressing force and effective plastic strains for either materials sensible or not to strain rate effects. Also, the numerical models proposed are related to single pressing at cold. Using the aluminium Al 6070 and Al 1100 alloys, the exploration and validation of the extended models was performed by comparison with experimental results of force. Besides, from the analysis of the 2D models, the evaluation of the plasticity condition allowed to verify that the material was plastically deformed when it crosses the channels intersection region. This fact was not explored in the recent literature. In addition, the limitation of the uniaxial tensile or compression hardening curves for the representation of this severe forming process is shown. Afterwards, the factorial 2 qualitative analysis permitted an appreciable classification in order of relevance was showed for all considered parameters in the proposed theoretical models. Moreover, this analysis indicated the die configurations and pressing conditions that should be intensively investigated. The simulation of these cases, considering a hypothetical material with plastic or viscoplastic behaviors, revealed that the strain-rate effect increases the load predictions. This fact was confirmed by the curves of von Mises effective stresses. In addition, shearing is the predominating deformation mode in the absence of fillet radii and only with the outer fillet radii. For dies with identical fillet radii, the material was deformed by shearing and bending. On the other hand, using interstitial free steel, the existence of critical friction condition that avoids the adherence phenomenon and the heterogeneous effective plastic strain distributions were verified. Finally, the consistency of the 2D and 3D numerical models in the simulation of the equal channel angular pressing was investigated in terms of load, by the comparison with the experimental predictions for aluminum Al 1100 alloy.","PeriodicalId":137692,"journal":{"name":"Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2019-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124046165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

BREVE HISTÓRICO DO GRUPO DE PESQUISA 研究小组的简史

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910061

引用次数: 0

FUNCIONAMENTO DO LABISISBIO 拉比奥的工作原理

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910062

引用次数: 0

WORKSHOP, ENTREVISTAS, SEMINÁRIOS E OUTROS 研讨会、访谈、研讨会等

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.85919100610

引用次数: 0

PÓS-DOUTORANDOS 博士后

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910067

引用次数: 0

MESTRANDOS MESTRANDOS

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910065

引用次数: 0

BREVE HISTÓRICO DO GRUPO DE PESQUISA-VISÃO DO AUTOR 研究小组简史-作者的愿景

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910063

引用次数: 0

PUBLICAÇÕES DIVERSAS 各种出版物

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 2019-06-10 DOI: 10.22533/at.ed.8591910069

引用次数: 0

TRABALHOS DE CONCLUSÃO DE CURSOS (TCC) 课程完成工作(TCC)

Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica Pub Date : 1900-01-01 DOI: 10.22533/at.ed.8591910064

Para A Entrega, DO Formulário, E. PRÉ-PROJETO, Para A Solicitação, E. Defesa, do Trabalho

{"title":"TRABALHOS DE CONCLUSÃO DE CURSOS (TCC)","authors":"Para A Entrega, DO Formulário, E. PRÉ-PROJETO, Para A Solicitação, E. Defesa, do Trabalho","doi":"10.22533/at.ed.8591910064","DOIUrl":"https://doi.org/10.22533/at.ed.8591910064","url":null,"abstract":"The present work is a qualitative extension of the studies begun in ESO (Mandatory Supervised Internship). The installation of another aquaponics system in a building located in Sossego street, located in the Boa Vista neighborhood, central region of Recife, where the Cultural Center Brazilian Germany (CCBA) operates, has enabled us to carry out a comparative analysis with systems that were (UFRPE) campus, as well as another system set up at the Professor Johei Koike (UFRPE) Aquaculture Station / Department of Fisheries and Aquaculture (DEPAQ), also on the campus of the Aquaculture and Sustainability Laboratory of the Department of Animal Science of the Federal Rural University of Pernambuco headquarters of (UFRPE). Some observation points followed the following variables and requirements such as: system assembly; necessary materials; water conditions (pH, temperature, dissolved oxygen, carbonate hardness, toxic ammonia, nitrite); conditions of light incidence; productivity; monitoring of the system in fish farming and plant cultivation; management of the aquaponic system, yield of final production (animal and plant biomass), emergence of pests and diseases for animals and plants, evaluate responses of both to the conditions found in each parameter, besides costs for such an undertaking. However, to make a general survey of all the data inherent to the project and to evaluate the viability of this project, it should be used in small spaces, with little supply or availability of natural resources, deficiency in organic food production and work. The work also has the purpose of generating technical knowledge that can be applied in society, especially in family agriculture, with small and medium-sized rural producers and in urban centers, constituting a possible source of organic food, besides the possibility to be an alternative income generation for many families inserted in rural areas, thus avoiding the increase of the rural exodus and the most important, helping to solve the great problem of hunger in the world, especially in the most needy regions such as the Brazilian Northeast. This experimental research was carried out under the cultivation methodology of the Nutrient Film Techinique (NFT), and until the last test performed, the above-mentioned parameters as system variables, were zeroed to those that are systemic such as toxic ammonia and nitrites, as expected, showing the efficiency of systems in symbiotic processes.","PeriodicalId":137692,"journal":{"name":"Coletânea de Atividades em Pesquisa Científica e Inovação Tecnológica","volume":"290 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123271972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3