Title

PREDICTION OF THE UNIAXIAL TENSILE PLASTIC BEHAVIOR OF A DEEP-DRAWING QUALITY STEEL USING DIFFERENT WORK-HARDENING EQUATIONS

PREDICTION OF THE UNIAXIAL TENSILE PLASTIC BEHAVIOR OF A DEEP-DRAWING QUALITY STEEL USING DIFFERENT WORK-HARDENING EQUATIONS

Authorship

Gonoring, Tiago Bristt; Orlando, Marcos Tadeu D’Azeredo; Ferreira, Jetson Lemos; Souza, Marden Valente de; Moreira, Luciano Pessanha

Gonoring, Tiago Bristt

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Orlando, Marcos Tadeu D’Azeredo

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Ferreira, Jetson Lemos

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Souza, Marden Valente de

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Moreira, Luciano Pessanha

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DOI

10.5151/2594-5297-32391

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Abstract

The necessary time to launch a vehicle has been reduced year by year due to, among other factors, softwares improvement that can predict forming process and application performances. The material behavior is one of fundamental issue to guarantee accuracy in numerical simulations. The relationship of the stress-strain determined by uniaxial tensile test is an information required in forming softwares. The strains obtained in stamping process normally are higher than those reached by tensile test. Therefore, it is necessary to extrapolate of the tensile data to predict the steel plastic behavior under biaxial stress state. This implies the development of new constitutive models or better application of old models. Among the models already known, this study makes use of the following constitutive equations: Hollomon, Ludwik Swift, Hockett-Sherby and Voce in the uniaxial tensile behavior of the steel. The results showed that the Swift, Hockett-Sherby and Voce equations, in general, present good fit to the experimental data. The initial (near of yield strength) and final (near of tensile strength) part of the stress-strain curve was best fitted by the combination of the Swift and Hockett-Sherby plastic models.

The necessary time to launch a vehicle has been reduced year by year due to, among other factors, softwares improvement that can predict forming process and application performances. The material behavior is one of fundamental issue to guarantee accuracy in numerical simulations. The relationship of the stress-strain determined by uniaxial tensile test is an information required in forming softwares. The strains obtained in stamping process normally are higher than those reached by tensile test. Therefore, it is necessary to extrapolate of the tensile data to predict the steel plastic behavior under biaxial stress state. This implies the development of new constitutive models or better application of old models. Among the models already known, this study makes use of the following constitutive equations: Hollomon, Ludwik Swift, Hockett-Sherby and Voce in the uniaxial tensile behavior of the steel. The results showed that the Swift, Hockett-Sherby and Voce equations, in general, present good fit to the experimental data. The initial (near of yield strength) and final (near of tensile strength) part of the stress-strain curve was best fitted by the combination of the Swift and Hockett-Sherby plastic models.

Keywords

WORK-HARDENING equations, Forming software, Deep Dawing Quality

WORK-HARDENING equations, Forming software, Deep Dawing Quality