Determination of Combined Hardening Parameters to Simulate Deformation Behavior of C(T) Specimen under Cyclic Loading

Cyclic hardening rule is important to simulate deformation behaviors in low cycle fatigue analysis. Due to a complexity of cyclic hardening, it is hard to predict deformation of components accurately. Also, in the case of a cracked problem, severe deformation occurs in the region of crack front. To perform low cycle fatigue analysis and predict deformation behaviors, the type of cyclic hardening rule should be determined. In this study, the determination procedures of combined hardening parameters (Chaboche model) are described briefly and the effects of two parameters on deformation behavior are analyzed. Combined hardening parameters are determined from each hysteresis loop with different strain amplitudes. The experiment data from two different materials (SA312 TP316 stainless steel and CF8A cast austenite stainless steel) and two different load ratios (R=-0.5 and -0.1) are used for simulations. In addition, hysteresis loops from three strain amplitudes are used to explain how the parameters from different strain amplitudes can influence on deformations of cyclic C(T) simulation.