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Previous issue date: 2010-03-30 / In this paper we developed a prototype for dynamic and quantitative analysis of the
hardness of metal surfaces by penetration tests. It consists of a micro-indenter which
is driven by a gear system driven by three-rectified. The sample to be tested is
placed on a table that contains a load cell that measures the deformation in the
sample during the penetration of micro-indenter. With this prototype it is possible to
measure the elastic deformation of the material obtained by calculating the depth of
penetration in the sample from the difference of turns between the start of load
application to the application of the load test and return the indenter until the
complete termination of load application. To determine the hardness was used to
measure the depth of plastic deformation. We used 7 types of steel trade to test the
apparatus. There was a dispersion of less than 10% for five measurements made on
each sample and a good agreement with the values of firmness provided by the
manufacturers. / Nesse trabalho ? desenvolvido um prot?tipo para an?lise din?mica e quantitativa da
dureza de superf?cies met?licas atrav?s de ensaios de penetra??o. Ele consiste de
um micro-penetrador que ? movimentado por um sistema de engrenagens guiado
por tr?s pinos retificados. A amostra a ser ensaiada ? colocada sobre uma mesa que
cont?m uma c?lula de carga que mede a deforma??o na amostra durante a
penetra??o do micro-penetrador. Com esse prot?tipo ? poss?vel medir a deforma??o
el?stica do material obtida pelo c?lculo, atrav?s de software, da profundidade da
penetra??o na amostra a partir da diferen?a de voltas entre o in?cio de aplica??o de
carga at? a aplica??o total da carga de teste e o retorno do indentador at? a
completa finaliza??o da aplica??o de carga. Para determina??o da dureza foi
utilizada a medida da profundidade de deforma??o pl?stica. Foram utilizados 07
tipos de a?os comerciais para teste do aparato. Verificou-se uma dispers?o inferior a
10% para cinco medi??es efetuadas em cada amostra e uma boa concord?ncia com
os valores de dureza fornecidos pelos fabricantes.
| Identifer | oai:union.ndltd.org:IBICT/oai:repositorio.ufrn.br:123456789/12723 |
| Date | 30 March 2010 |
| Creators | Sousa, S?rgio Barros de |
| Contributors | CPF:09621199468, http://lattes.cnpq.br/7441669258580942, Sousa, R?mulo Ribeiro Magalh?es de, CPF:21514160463, http://lattes.cnpq.br/3246869695770169, Gomes, Uilame Umbelino, CPF:05012180410, http://lattes.cnpq.br/9858094266525225, Alves J?nior, Clodomiro |
| Publisher | Universidade Federal do Rio Grande do Norte, Programa de P?s-Gradua??o em Ci?ncia e Engenharia de Materiais, UFRN, BR, Processamento de Materiais a partir do P?; Pol?meros e Comp?sitos; Processamento de Materiais a part |
| 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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