Estimation of Material Parameters in Nonlinear Hardening Plasticity Models and Strain Life Curves for CuAg Alloy

International Conference on Materials, Processing and Product Engineering 2015

Novak, J. Srnec^1 ; Benasciutti, D.^1 ; De Bona, F.^1 ; Stanojevi, A.^2 ; De Luca, A.^3 ; Raffaglio, Y.^3

DIEGM, University of Udine, Via delle Scienze 206, Udine

33100, Italy^1

Department of Mechanical Engineering, Montanuniversität Leoben, Franz Josef-Straße 18, Leoben

8700, Austria^2

Centro Ricerche Danieli, Via Nazionale 41, Buttrio (UD)

33042, Italy^3

关键词: Continuous casting line;    Cyclic stress-strain;    Finite element simulations;    Low cycle fatigues;    Material parameter;    Nonlinear hardening;    Nonlinear kinematics;    Stress-strain loops;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/119/1/012020/pdf
DOI  :  10.1088/1757-899X/119/1/012020

来源: IOP

【 摘 要 】

This work investigates the cyclic response and low-cycle fatigue behaviour of a CuAg alloy used in crystallizer for continuous casting lines. Therefore isothermal strain-based fatigue tests are first performed on CuAg specimens at different temperature levels (20 °C, 250 °C, 300 °C). The evolution of stress-strain loops recorded during the cyclic tests is used for the parameter identification of several nonlinear hardening models (nonlinear kinematic, nonlinear isotropic). Cyclic stress-strain data from experiments are compared with results from numerical simulations with the identified material parameters, showing a satisfying agreement. Critical examination of numerical results from different models is also performed. Finally, the strain- life fatigue curves estimated from experimental data are compared with approximate strain-life equations (Universal Slopes Equation, 10% Rule) which are obtained from simple tensile tests. The material parameters determined in this work can conveniently be used as inputs in a elasto- plastic finite element simulations of a crystallizer.