Journal ArticleDOI
A simplified model of heat generation during the uniaxial tensile test
Yipeng Gao,Robert H. Wagoner +1 more
TLDR
In this paper, the effect of heat transfer conditions on the temperature increase of a sheet tensile specimen has been calculated by the finite difference method for a plain-carbon steel at various strain rates and in several environments.Abstract:
The temperature rise in a sheet tensile specimen has been calculated by the finite difference method for a plain-carbon steel at various strain rates and in several environments. Prior to necking, a uniform heat generation function is used with the governing flow equation while during the post-uniform strain, an empirical heat generation function is used. The empirical function is based on a strain distribution equation generated by curve fitting of experimental data. The effect of heat transfer conditions on the temperature increase has been discussed. The maximum temperature rise in air may reach 42 K at the center of an I.F. steel specimen at a strain rate of 10-2/s. The instability strain during tensile testing has been predicted by taking into account strain hardening, strain-rate hardening, and deformationinduced heating. The results show that significant deformation heating can occur during tensile testing in air at “normal” strain rates near 10-2/s, and that the uniform elongation can be affected markedly. Predictions for other alloys based on tabulated data are also presented.read more
Citations
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Journal ArticleDOI
A plastic constitutive equation incorporating strain, strain-rate, and temperature
TL;DR: An empirical plasticity constitutive form describing the flow stress as a function of strain, strain-rate, and temperature has been developed, fit to data for three dual-phase (DP) steels, and compared with independent experiments outside of the fit domain this paper.
Journal ArticleDOI
Hyperplasticity: Increased forming limits at high workpiece velocity
V.S. Balanethiram,Glenn S. Daehn +1 more
TL;DR: In a previous report, it was demonstrated that the forming limits of BCC interstitial free iron could be significantly increased by forming at high strain rates which were induced using a technique known as electrohydraulic forming as discussed by the authors.
Journal ArticleDOI
Increased ductility in high velocity electromagnetic ring expansion
TL;DR: In this paper, a classical electrodynamics analysis similar to one developed previously by Gourdin was employed to estimate sample velocities, and the experimental results showed that ductility of Al 6061 and OFHC Cu increases monotonically with increasing velocity.
Journal ArticleDOI
Effect of velocity on flow localization in tension
Xiaoyu Hu,Glenn S. Daehn +1 more
TL;DR: In this paper, one-dimensional dynamic numerical simulations of sheet tensile tests and expanding ring tests have been carried out to study the variation of ductility over a wide range of deformation velocities where inertial effects are significant.
Journal ArticleDOI
Determination of the fraction of plastic work converted into heat in metals
Paul Knysh,Yannis P. Korkolis +1 more
TL;DR: In this article, a new approach for measuring the fraction of plastic work that is converted into heat (also known as the Inelastic Heat Fraction, IHF or the Taylor-Quinney coefficient) during the plastic deformation of metals is proposed.
References
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Journal ArticleDOI
Effect of Strain Rate Upon Plastic Flow of Steel
Clarence Zener,J. H. Hollomon +1 more
TL;DR: In this paper, an experiment was designed to check the equivalence of the effects of changes in strain rate and in temperature on the stress-strain relation in metal deformation.
Journal ArticleDOI
Theory of the tensile test
TL;DR: In this paper, the tensile test is re-examined with special attention to the influence of strain rate sensitivity of the flow stress, and explicit formulae are deduced for the measured variables of the test in terms of the phenomenological parameters of the material.
Journal ArticleDOI
The Heat Developed during Plastic Extension of Metals
TL;DR: In this paper, it has been suggested that the phase change could be detected by measuring the heat evolved during a deformation, and com-ring with the heat equivalent of the work done on the metal by the forces inducing the deformation.
Journal ArticleDOI
Influence of strain-rate sensitivity on necking under uniaxial tension
John W. Hutchinson,K. W. Neale +1 more
TL;DR: In this article, the influence of material strain-rate dependence on necking retardation is studied and a nonlinear analysis for long-wavelength nonuniformities does reproduce the essential details of the phenomenon.
Journal ArticleDOI
Tensile instability and necking in materials with strain hardening and strain-rate hardening
TL;DR: In this paper, a simplified analytical model is presented, which reveals that a preexisting geometric imperfection can grow from the outset of deformation, even while the load rises.
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