TY - GEN

T1 - Structural-temporal features of high-rate deformation of high strength steels

AU - Selyutina, Nina

AU - Petrov, Yuri

N1 - Publisher Copyright: © 2017 TANGER Ltd., Ostrava.

PY - 2017

Y1 - 2017

N2 - Dynamic yield stress values predicted within the structural-temporal approach based on the incubation time concept and those found from the popular empirical Johnson-Cook and Cowper-Symonds formulas and its known modification are compared with the examples of high strength steels and nickel alloy subjected to highrate plastic deformation. It is shown that the structural-temporal approach is an efficient and convenient tool for calculations in a much wider range of deformation rates. An advantage of the yield stress calculations based on the incubation time criterion is the minimal number of parameters, which do not require further modifications at high strain rates, in contrast to the empirical Johnson-Cook model and Cowper-Symonds formulas. Experimental curves of the static and dynamic deformation (stress-strain curves) for two high strength steels are analyzed on the basis of the relaxation model of plasticity with a constant characteristic relaxation time definable from the structural-temporal approach. It is shown that the relaxation model predicts an existence of the yield drop phenomenon during high-rate deformation for advanced high strength steel and an absence of this effect in a wide range of strain rates for high strength 2.3Ni-1.3Cr steel.

AB - Dynamic yield stress values predicted within the structural-temporal approach based on the incubation time concept and those found from the popular empirical Johnson-Cook and Cowper-Symonds formulas and its known modification are compared with the examples of high strength steels and nickel alloy subjected to highrate plastic deformation. It is shown that the structural-temporal approach is an efficient and convenient tool for calculations in a much wider range of deformation rates. An advantage of the yield stress calculations based on the incubation time criterion is the minimal number of parameters, which do not require further modifications at high strain rates, in contrast to the empirical Johnson-Cook model and Cowper-Symonds formulas. Experimental curves of the static and dynamic deformation (stress-strain curves) for two high strength steels are analyzed on the basis of the relaxation model of plasticity with a constant characteristic relaxation time definable from the structural-temporal approach. It is shown that the relaxation model predicts an existence of the yield drop phenomenon during high-rate deformation for advanced high strength steel and an absence of this effect in a wide range of strain rates for high strength 2.3Ni-1.3Cr steel.

KW - Dynamic yielding

KW - Plasticity

KW - Relaxation plasticity model

KW - Steel

KW - Strain rate effect

UR - http://www.scopus.com/inward/record.url?scp=85043323011&partnerID=8YFLogxK

M3 - Conference contribution

AN - SCOPUS:85043323011

VL - 1

T3 - METAL 2017 - 26th International Conference on Metallurgy and Materials, Conference Proceedings

SP - 623

EP - 628

BT - METAL 2017 - 26th International Conference on Metallurgy and Materials, Conference Proceedings

PB - TANGER, Ltd.

CY - Keltickova 62, 710 00 Ostrava, Czech Republic, EU

T2 - 26th International Conference on Metallurgy and Materials, METAL 2017

Y2 - 24 May 2017 through 26 May 2017

ER -