TY - JOUR

T1 - Modeling the Nonmonotonic Behavior Flow Curves under Dynamic Loads

AU - Zhao, S.

AU - Petrov, Yu. V.

AU - Volkov, G. A.

N1 - Publisher Copyright: © 2022, Pleiades Publishing, Ltd.

PY - 2022/6/1

Y1 - 2022/6/1

N2 - Abstract: The paper proposes an incremental relaxation plasticity (IRP) model forpredicting possible instabilities and overall behavior of flow curves underdynamic loads. Compared to its original non-incremental version, the IRP modelallows one to predict the behavior of stress-strain curves over a longer timeafter the start of yielding and to more accurately describe their instabilitiessuch as sharp yield points (yield drops) and further nonmonotonic or oscillatoryeffects. The efficiency of the IRP model is demonstrated by comparing itspredictions with those of the original non-incremental version and of the widelyknown Johnson–Cook model on the example of experimental flow curves fordual-phase high-strength steel DP800 and aluminum alloy 2519A. The major featureof the proposed IRP model is that its parameters are invariant with the loadinghistory and strain rate of a material and are related only to the evolution ofits defect structure on the micro- and mesoscales. With such a set of IRP modelparameters, one can obtain a variety of flow curves of the same material atwidely varied strain rates.

AB - Abstract: The paper proposes an incremental relaxation plasticity (IRP) model forpredicting possible instabilities and overall behavior of flow curves underdynamic loads. Compared to its original non-incremental version, the IRP modelallows one to predict the behavior of stress-strain curves over a longer timeafter the start of yielding and to more accurately describe their instabilitiessuch as sharp yield points (yield drops) and further nonmonotonic or oscillatoryeffects. The efficiency of the IRP model is demonstrated by comparing itspredictions with those of the original non-incremental version and of the widelyknown Johnson–Cook model on the example of experimental flow curves fordual-phase high-strength steel DP800 and aluminum alloy 2519A. The major featureof the proposed IRP model is that its parameters are invariant with the loadinghistory and strain rate of a material and are related only to the evolution ofits defect structure on the micro- and mesoscales. With such a set of IRP modelparameters, one can obtain a variety of flow curves of the same material atwidely varied strain rates.

KW - incremental relaxation plasticity model

KW - flow curve

KW - Instabilities

KW - nonmonotonic effects

KW - characteristic time

KW - constitutive relations

KW - Dynamic yielding

KW - dynamic yielding

KW - instabilities

UR - https://link.springer.com/article/10.1134/S1029959922030031

UR - http://www.scopus.com/inward/record.url?scp=85132109034&partnerID=8YFLogxK

UR - https://www.mendeley.com/catalogue/de4bc72d-275d-3c3e-893f-8bb097adbd86/

U2 - 10.1134/s1029959922030031

DO - 10.1134/s1029959922030031

M3 - Article

VL - 25

SP - 221

EP - 226

JO - Physical Mesomechanics

JF - Physical Mesomechanics

SN - 1029-9599

IS - 3

M1 - 25

ER -