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Numerische Simulation des lokalen Verformungsverhalten der Magnesiumlegierung MgAl3Zn1
Author(s) -
Zhang F.,
Liu Z.,
Mao P.,
Wang F.,
Liu Y.
Publication year - 2019
Publication title -
materialwissenschaft und werkstofftechnik
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.285
H-Index - 38
eISSN - 1521-4052
pISSN - 0933-5137
DOI - 10.1002/mawe.201800120
Subject(s) - materials science , magnesium alloy , adiabatic shear band , strain rate , shear band , deformation (meteorology) , composite material , alloy , compression (physics) , constitutive equation , adiabatic process , stress (linguistics) , viscoplasticity , strain (injury) , shear stress , metallurgy , shear (geology) , finite element method , structural engineering , thermodynamics , engineering , physics , medicine , linguistics , philosophy
The dynamic compression behavior of AZ31B magnesium alloy with hat shaped specimen was investigated at high strain rate in this paper. Based on the Johnson‐cook constitutive model and fracture model, the interaction of temperature, stress and strain fields of AZ31B magnesium alloy with hat shaped specimen were numerically simulated by using ANSYS/LS‐DYNA software under different strain rates, which was validated by experiment. It is found that the plastic strain is highly concentrated on the corner of the hat shaped specimen, which leads to large localized deformation. The voids are nucleated and extended by compression stress. Work harden effect is caused by remained plastic strain, which is located around adiabatic shear band. The stress collapse is discovered in gauge section, which is also discovered in experiment. Thermal soften effect is suppressed with the strain rate increased.