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Previous issue date: 2016-12-19 / O cabo de a?o ? um dos principais elementos em equipamentos de i?amento ou
transporte de cargas. Durante o funcionamento dos equipamentos, tal elemento ? submetido ?
movimentos oscilat?rios que promovem desgaste e at? mesmo forma??o de trincas no
material. Com o intuito de avaliar os danos ocasionados em um cabo de a?o, submetido ?
vibra??es de baixa amplitude, um aparato experimental foi elaborado e instalado a fim de
simular o funcionamento de um sistema de eleva??o utilizando polias e um cabo de a?o com a
seguinte constru??o: 1/4? 6x19 S AFA sZ polido. Neste aparato experimental, o cabo de a?o
foi carregado com 25 N a fim de promover tensionamento adequado ao funcionamento do
equipamento. Amostras de cabo foram coletadas e analisadas por Microscopia Eletr?nica de
Varredura (MEV) e Espectroscopia por Energia Dispersiva (EDS) antes dos ensaios, ap?s
ensaios de 120.000 ciclos e 3.000.000 ciclos. O presente trabalho revelou danos superficiais no material estudado inerentes ao
processo de fabrica??o do cabo de a?o e possibilitou a visualiza??o do dano superficial
sofrido pelo material em regi?es de contato espec?ficas do cabo de a?o, revelando diversos
mecanismos de danos atuantes em um cabo de a?o solicitado por um par press?o x velocidade
de deslizamento. Nos ensaios realizados, o aparato experimental foi configurado para
promover movimento oscilat?rio com amplitude m?xima de 300 ?m a fim de simular golpes
no cabo de a?o que se assemelham ?s rea??es de funcionamento desse sistema em campo. A defini??o dos m?todos de an?lises neste trabalho e a avalia??o do dano superficial
provocado em laborat?rio ? fundamental para introduzir no mercado meios de manuten??o
preditiva, al?m de produtos ou recursos para minimizar o desgate e, inclusive, aumentar o
tempo de vida do material. / The steel wire rope is one of the main elements in lifting or weight load transportation
equipments. During the operation of the equipments, the steel wire rope is subjected to
oscillatory movements that cause wear and even cracking in the material. In order to evaluate the damage caused in a steel wire rope subjected to low amplitude
vibrations, an experimental apparatus was designed and installed to simulate the operation of
a lifting system using sheaves and a steel wire rope with the following construction: 1/4?
6x19 S FC RR bright. In this experimental apparatus, the steel wire rope was loaded with 25
N in order to exert the proper tension for the operation of the equipment. Steel wire rope samples were collected and analysed by Scanning Electron
Microscopy (SEM) and Energy Dispersive Spectroscopy (EDS) before the experiment, then
after a run of 120,000 cycles and 3,000,000 cycles. This work revealed surface damages in the studied material inherent to the
manufacturing process of the steel wire rope and allowed the visualisation of surface damage
in specific contact regions of the steel wire rope, revealing several mechanisms of damage
acting in a steel wire rope subjected to a pressure x slip speed pair. In the carried out tests, the
experimental apparatus was configured to promote oscillatory motion with a maximum
amplitude of 300 ?m in order to simulate shocks on the steel cable that resemble the operating
reactions of this system in the field. The definition of the analysis methods in this study and the evaluation of the surface
damage caused in the laboratory is fundamental to introduce means of predictive maintenance
in the industry, as well as products or resources to minimize the wear and to increase the
lifespan of the material.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/24548 |
| Date | 19 December 2016 |
| Creators | Elp?dio, Camilla Milena de Ara?jo |
| Contributors | 10973370491, Lima, Jos? de Anchieta, 36973637434, Souza, Juliana Ricardo de, 05844998413, Oliveira Filho, Manoel Fernandes de, 03928730444, Medeiros, Jo?o Tel?sforo N?brega de |
| Publisher | PROGRAMA DE P?S-GRADUA??O EM ENGENHARIA MEC?NICA, UFRN, Brasil |
| Source Sets | IBICT Brazilian ETDs |
| Language | Portuguese |
| Detected Language | English |
| Type | info:eu-repo/semantics/publishedVersion, info:eu-repo/semantics/masterThesis |
| 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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