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Previous issue date: 2010-12-21 / We developed an assay methodology that considered the temperature variation and
the scanning electron microscopy as a method to quantify and characterize respectively the
consumption evolution in three 46 LA machines, with internal combustion and two-stroke
engines, 7.64 cm3 cylinder capacity, 23.0 millimeters diameter and 18.4 millimeters course,
RPM service from 2.000 to 16.000 rpm, 1.2 HP power, and 272 grams weight. The
investigated engines components were: (1) head of the engine (Al-Si alloy), (2) piston (Al-Si
alloy) and (3) piston pin (AISI 52100 steel). The assays were carried out on a desktop;
engines 1 and 2 were assayed with no load, whereas in two assays of engine 3 we added a fan
with wind speed that varied from 8.10 m/s to 11.92 m/s, in order to identify and compare the
engine dynamic behavior as related to the engines assayed with no load. The temperatures of
the engine s surface and surroundings were measured by two type K thermopairs connected to
the assay device and registered in a microcomputer with data recording and parameters
control and monitoring software, throughout the assays. The consumed surface of the
components was analyzed by scanning electron microscopy (SEM) and microanalysis-EDS.
The study was complemented with shape deformation and mass measurement assays. The
temperature variation was associated with the oxides morphology and the consumption
mechanisms were discussed based on the relation between the thermal mechanical effects and
the responses of the materials characterization / Foi desenvolvida uma metodologia de ensaio que considerou a varia??o da
temperatura e a microscopia eletr?nica de varredura um m?todo de quantificar e qualificar
respectivamente a evolu??o do desgaste em tr?s m?quinas 46 LA de motor de combust?o
interna de dois cursos, com uma capacidade de cilindro de 7,64 cm3, de 23,0 mil?metros de
di?metro e de curso de 18.4 mil?metros, RPM de servi?o de 2.000 a 16.000 rpm, pot?ncia de
1,2 HP, peso de 272 gramas. Os componentes do motor investigados foram: (1) cabe?a do
motor (liga Al-Si), (2) pist?o (liga Al-Si) e (3) pino do pist?o (A?o AISI 52100). Os ensaios
foram realizados em uma bancada, os motores 1 e 2 foram ensaiados sem carga, e o motor 3
foi adicionado a dois ensaios um ventilador com velocidade do vento que variava entre 8,10
m/s a 11,92 m/s, com a finalidade de identificar e comparar o comportamento din?mico do
motor com os motores ensaiados sem carregamento. As temperaturas pr?xima ao contato e
ambiente foram medidas atrav?s de dois termopares tipo K conectados ao dispositivo de
ensaio e registradas por um microcomputador com software de aquisi??o de dados, controle e
monitoramento dos par?metros durante os ensaios. A superf?cie desgastada dos componentes
foi analisada por microscopia eletr?nica de varredura (MEV) e microan?lise-EDS. O estudo
foi complementado por ensaios de desvio de forma e medi??o de massa. A varia??o de
temperatura associou-se ? morfologia dos ?xidos e os mecanismos de desgastes evidenciados
foram discutidos correlacionando-se a solicita??o termomec?nica ?s respostas da
caracteriza??o dos materiais
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/15625 |
| Date | 21 December 2010 |
| Creators | Lima, ?rika Christiane Correia de |
| Contributors | CPF:10973370491, http://lattes.cnpq.br/3206952338356447, Silva, Ademir Oliveira da, CPF:16225422404, http://lattes.cnpq.br/3511004608337461, Matamoros, Efrain Panteleon, CPF:21896458831, Souza, Roberto Silva de, CPF:44466927472, http://lattes.cnpq.br/4012782800846844, Medeiros, Jo?o Tel?sforo N?brega de |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Engenharia Mec?nica, UFRN, BR, Tecnologia de Materiais; Projetos Mec?nicos; Termoci?ncias |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| Format | application/pdf |
| Source | reponame:Repositório Institucional da UFRN, instname:Universidade Federal do Rio Grande do Norte, instacron:UFRN |
| Rights | info:eu-repo/semantics/openAccess |
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