MODELLING OF STRAIN HARDENING OF DUAL PHASE STEELS
Keywords:
KEYWORDS: Constitutive Equations; Tensile Strength; Strain-Hardening; Dual Phase Steels; Plastic Deformation; Necking Instability.Abstract
ABSTRACT
The strain hardening behaviors of dual phase steel with different volume fraction were studied using empirical models. The applicability of Log-method in describing the true stress-true plastic strain of dual phase steels was investigated. The tensile test data were analyzed by Hollomon equation and the results showed that the equation was not applicable for total plastic deformation stage.
The root-mean-square of residual percentage (RMSRP) was calculated for the curves obtained by regression formulae. The values of the Log-method parameters obtained by regression formulae were in good agreement with the experimental data.
It was found that increasing the volume fraction of martensite has a noticeable effect on the value of true strain at necking instability , when Log-method model is used. On the other hand, by using Hollomon model, the value of true strain at necking instability was moderately increased by increasing the volume fraction of martensite. https://jer.ly/PDF/Vol-32-2021/JER-03-32-Abstract.php?f=a
