Abstract
Significance of time independent and dependent constitutive modeling to analyze macroscopic material deformation behavior employing semi-implicit integration is studied in this work. A simplified expression for infinitesimal plastic strain increment is discussed. Investigation of cyclic hardening behavior of SS 316 L is carried out at various mean stresses under uniaxial cyclic mechanical loading. The corresponding results are aimed to differentiate the cyclic hardening/deformation behavior at room temperature and 550 °C using time independent (Model-1) and time dependent (Model-2) constitutive models. Cyclic hardening phenomenon is characterized into Phases-I and -II representing rapid and slow hardening zones, respectively which further reveals the severity of damage during asymmetric cyclic loading for Models-1 and -2. Suitability of the constitutive models at different temperature and stressing rates is proposed depending on contribution of viscoplasticity/rate dependence. Present formulation is validated by comparing the results with previously published experimental data.
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