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The role of J 3 in the Orientation Analysis of the Adiabatic Shear Band of Ultrafine‐Grained Interstitial‐Free Steel
Author(s) -
Liu Jiejian,
Suo Tao
Publication year - 2020
Publication title -
steel research international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.603
H-Index - 49
eISSN - 1869-344X
pISSN - 1611-3683
DOI - 10.1002/srin.201900222
Subject(s) - adiabatic shear band , materials science , split hopkinson pressure bar , shear (geology) , adiabatic process , instability , shear band , scanning electron microscope , composite material , critical resolved shear stress , mechanics , physics , strain rate , shear rate , thermodynamics , viscosity
Within the framework of classical plastic theory, the instability inclination angle of metal is 45 ° under axial compression loading. However, microscopic observations by scanning electron microscopy (SEM) and transmission electron microscopy (TEM) show the ultrafine‐grained (UFG) interstitial‐free (IF) steel inclination angle of adiabatic shear instability is less than 45 °. Herein, a constitutive model that accounts for the effect of the third stress invariant is proposed based on the Johnson–Cook model to investigate the effect of J 3 on the adiabatic shear instability inclination angle of UFG IF steel. To give a clear and direct interpretation of this effect, the model is implemented in the commercial software ABAQUS/Explicit by user subroutine VUMAT. Then shear‐compression specimens with different groove angles are used to investigate the influence of J 3 on the orientation of adiabatic shear band. Subsequently, dynamic tests of UFG IF steel shear‐compression specimen with different groove angles are conducted through Split‐Hopkinson Pressure Bar. The experimental results show that noncoaxial influence (the effect of J 3 or Lode angle) deserves enough attention in the orientation analysis of adiabatic shear instability of UFG IF steel.