Journal of Theoretical
and Applied Mechanics
51, 1, pp. 63-73, Warsaw 2013
Constitutive model for time-dependent ratchetting of SS304 stainless steel: simulation and its finite element analysis
Time-dependent ratchetting behaviour of SS304 stainless steel was experimentally conducted at room temperature and 973 K. The material shows distinct time-dependent deformation. However, under cyclic stressing with a certain peak/valley stress hold and at 973 K, more significant time-dependent inelastic behaviour was observed. Based on the Abdel-Karim-Ohno nonlinear kinematic hardening rule with the static recovery term, a time-dependent hardening rule incorporating an internal variable in the dynamic recovery term of the back stress is proposed to reasonably describe the evolution behaviour of time-dependent ratchetting with a certain peak/valley stress hold and at high temperature. Simultaneously, the proposed model is implemented into the ANSYS finite element package by User Programmable Features (UPFs). It is shown that the customized ANSYS model exhibits better performance than the reference model, especially under cyclic stressing with the certain peak/valley stress hold and at high temperature.
Keywords: ratchetting; time-dependence; constitutive model; finite element method