Title:	Análise comparativa do efeito da fadiga por fretting nos fios de cabos condutores formados pelas ligas de alumínio 1120 e AA 6201
Authors:	Vieira, Erick Rocha
metadata.dc.contributor.email:	rochaverick@gmail.com
Orientador(es)::	Ferreira, Jorge Luiz de Almeida
Assunto::	Energia elétrica - distribuição Energia elétrica - transmissão Fadiga por fretting Ligas de alumínio Cabos condutores
Issue Date:	21-Sep-2020
Data de defesa::	5-Mar-2020
Citation:	VIEIRA, Erick Rocha. Análise comparativa do efeito da fadiga por fretting nos fios de cabos condutores formados pelas ligas de alumínio 1120 e AA 6201. 2020. 72 f., il. Dissertação (Mestrado em Ciências Mecânicas)—Universidade de Brasília, Brasília, 2020.
Abstract:	Systematic studies are needed on the main component of a transmission line, the conductor cable, in order to improve the process of transmission and distribution of electrical. One of the mechanical problems that most affect conductor cable's life is the fretting fatigue phenomenon. In this context, the aim of this dissertation was to analyze the fatigue life between AA 6201 T81 and AA 1120 alloy wires comparatively through an experimental program, which would allow the isolation of the fretting phenomenon under controlled conditions. To achieve these goals, a program of tests was developed in the mechanical testing laboratories at the University of Brasília. The program was based on three stages. First, the materials were characterized by tensile tests and fatigue tests. Second stage, the fretting induction tests were carried out under controlled conditions. These conditions were determined by the contact angle of 29o and normal contact loads of 250 N, 500 N, 750 N and 1000 N. The third stage consisted on the microscopic analysis of the contact regions between the wires, in addition to the failure surfaces. Finally, with the results obtained, it was possible to verify that fretting induction generated two distinct scenarios, the first, wear, and the second, fretting fatigue. These characteristics were proven through the observation of failures through microscopy. For the AA 6201 T81 alloy wires, fretting fatigue was observed in the 750 N and 1000 N tests, in the 250 N load it proved that there was wear, for the 500 N load, both types of contact problems was noted, which may indicate that there is a transition region for this force. On the other hand, all the curves referring to the wires of the 1120 aluminum alloy had their faults classified as fretting fatigue. In the comparison between the curves that occurred fretting fatigue for both alloys (750 N and 1000 N), it was found that the AA 6201 T81 alloy wires were more sensitive to fretting, despite having greater static and fatigue endurance.
metadata.dc.description.unidade:	Faculdade de Tecnologia (FT) Departamento de Engenharia Mecânica (FT ENM)
Description:	Dissertação (mestrado)—Universidade de Brasília, Faculdade de Tecnologia, Departamento de Engenharia Mecânica, 2020.
metadata.dc.description.ppg:	Programa de Pós-Graduação em Ciências Mecânicas
Licença::	A concessão da licença deste item refere-se ao termo de autorização impresso assinado pelo autor com as seguintes condições: Na qualidade de titular dos direitos de autor da publicação, autorizo a Universidade de Brasília e o IBICT a disponibilizar por meio dos sites www.bce.unb.br, www.ibict.br, http://hercules.vtls.com/cgi-bin/ndltd/chameleon?lng=pt&skin=ndltd sem ressarcimento dos direitos autorais, de acordo com a Lei nº 9610/98, o texto integral da obra disponibilizada, conforme permissões assinaladas, para fins de leitura, impressão e/ou download, a título de divulgação da produção científica brasileira, a partir desta data.
Agência financiadora:	Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES); Fundação de Empreendimentos Científicos e Tecnológicos (FINATEC); Transmissoras Brasileiras de Energia (TBE) e Agência Nacional de Energia Elétrica (ANEEL).
Appears in Collections:	Teses, dissertações e produtos pós-doutorado

Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.