TY - JOUR

T1 - Temperature relaxation model of plasticity for metals under dynamic loading

AU - Selyutina, N.S.

N1 - Publisher Copyright: © 2020 Elsevier Ltd

PY - 2020/11

Y1 - 2020/11

N2 - Temperature-time effects on metals based on the relaxation model of plasticity have been evaluated. The plastic deformation of 7xxx and 2xxx aluminium alloys and EUROFER97 steel in a strain rate range from 0.001 to 4200 s−1 and a temperature range from −100 to 700 °C was analysed to determine the structural and temporal characteristics of the material, independent of loading history. Expressions of the static yield stress and the characteristic time as a function of temperature are formulated based on the “temperature multiplier” of the Johnson-Cook model (Johnson and Cook, 1985), which is obtained for the case of static loading and zero plastic strain. It is shown that the expanded relaxation model of plasticity is effectively capable to predict material responses of metals in wide ranges of strain rates and temperatures with a constant characteristic relaxation time. Based on theoretical stress-strain dependence, calculated by the relaxation model of plasticity, estimations of the ductile-brittle transition temperature of 2519A aluminium alloy at strain rates of the order 103 s−1 are given.

AB - Temperature-time effects on metals based on the relaxation model of plasticity have been evaluated. The plastic deformation of 7xxx and 2xxx aluminium alloys and EUROFER97 steel in a strain rate range from 0.001 to 4200 s−1 and a temperature range from −100 to 700 °C was analysed to determine the structural and temporal characteristics of the material, independent of loading history. Expressions of the static yield stress and the characteristic time as a function of temperature are formulated based on the “temperature multiplier” of the Johnson-Cook model (Johnson and Cook, 1985), which is obtained for the case of static loading and zero plastic strain. It is shown that the expanded relaxation model of plasticity is effectively capable to predict material responses of metals in wide ranges of strain rates and temperatures with a constant characteristic relaxation time. Based on theoretical stress-strain dependence, calculated by the relaxation model of plasticity, estimations of the ductile-brittle transition temperature of 2519A aluminium alloy at strain rates of the order 103 s−1 are given.

KW - Aluminium structures

KW - Yield stress

KW - Relaxation time constant

KW - Dynamic loading

KW - Temperature dependence

KW - STRAIN-RATE

KW - TIMES

KW - BEHAVIOR

KW - DEFORMATION

KW - MECHANICAL-PROPERTIES

KW - ALUMINUM

KW - JOHNSON-COOK MODEL

KW - RATES

KW - RANGE

UR - http://www.scopus.com/inward/record.url?scp=85090747246&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/581409f4-c463-3a0d-89e1-6d43a8bf2e9e/

U2 - 10.1016/j.mechmat.2020.103589

DO - 10.1016/j.mechmat.2020.103589

M3 - Article

VL - 150

JO - Mechanics of Materials

JF - Mechanics of Materials

SN - 0167-6636

M1 - 103589

ER -