Title

ENSAIOS DE COMPRESSÃO EM AÇOS PARA FIXADORES

COMPRESSION TEST IN STEELS FOR FASTENERS

Authorship

Boratto, Francisco; Marchi, Leandro; Paes, José Eustáquio; Tupinambás, Ubiratan

Boratto, Francisco

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Marchi, Leandro

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Paes, José Eustáquio

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Tupinambás, Ubiratan

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DOI

10.5151/2594-5327-0028

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Abstract

É objetivo deste trabalho desenvolver a metodologia de análise de dados gerados em ensaios de compressão utilizando “máquina universal de ensaios”, sem uso de extensômetro, e aplicar a metodologia para avaliar três tipos de aço/fluxo de fabricação de arames, utilizados para fabricação de fixadores. A comparação entre os diversos tipos de aço/fluxo de fabricação foi feita através do “coeficiente de resistência”, K, na equação empírica que relaciona a deformação plástica verdadeira com a tensão verdadeira, chamada equação de Hollomon (

The objective of this work is to develop the methodology of analysis of data generated in compression tests using "standard compression machine", without the use of extensometer, and to apply the methodology to evaluate several types of steel/flow of production of Belgo, used for fasteners production. The comparison among the several types of production steel/flow was made through the "resistance" coefficient, K, in the empiric equation that relates the true plastic deformation with the true tension, called Hollomon ́s equation ( = K n). To this equation a term representing the friction between dies and sample was added, P and the four empirical parameters asjusted by non-linear optimization techniques. The analyzed steels were: SAE1003, SAE10B22 and SAE5135, in several processing conditions involving wire rod (FM), wire treated with final annealing (EF) and wire treated with annealing in the process (EP). As a conclusion it was found that the smallest values of K are associated with the EP conditions associated to low carbon grade.


Keywords

Compressão; Arame; Fixadores; Hollomon.

Compression test; Wire; Fasteners.