Analysis Of Adiabatic Heating In High Strain Rate
Torsion Tests By An Iterative Method:
Application To An Ultrahigh Carbon Steel
Author(s)
J. Castellanos, I. Rieiro, M. Carsí, J. Muñoz & O. A. Ruano
Abstract
An iterative algorithm has been developed to establish the adiabatic heating
correction of flow curves for torsion tests of an ultrahigh carbon steel containing
1.3% C. High temperatures (1223 to 1473 K) and high strain rates (2, 5, 10 and
26 s-1) were used. The curves are corrected in a finite and discrete set of strain
data by means of parametric derivatives and integration on the initial curve
without correction. The process is repeated until the termination tolerance for the
stress is less than 10-2 MPa. Usually, four iterations are needed to reach this
tolerance. The corrections are bounded by the maximum of mechanical energy
available to be converted into heat. The corrections are carried out until a true
strain ε= 4 in order to avoid the effects of flow localization in the material.
Keywords: adiabatic heating, torsion test, modelling, simulation, Garofalo
equation, hot working.
1 Introduction
Torsion tests at high temperatures and strain rates of materials usually show a
strong increment of temperature during the test above the programmed
temperature that is attributed to adiabatic heating [1]. The temperature correction
due to adiabatic heating has been discussed in various works [1–6]. The
following expression is usually considered:
( ) ∫ ⋅ ⋅
⋅
= ∆
ε
ε
ε ε σ
ρ
η
ε
max
. ) ( d
C
A Ti (1)
Keywords
adiabatic heating, torsion test, modelling, simulation, Garofalo
equation, hot working.
Related Book
Other papers in this volume
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