COMPARISON OF THE UNIAXIAL BEHAVIOR OF THE INELASTIC CONSTITUTIVE MODELS OF MILLER AND WALKER BY NUMERICAL EXPERIMENTS

The uniaxial behavior of Miller's and Walker's model is compared. Based on parameters identified by Walker, numerical experiments are performed for monotonic and cyclic strain controlled loading histories. The results of these calculations are compared with experimental data. It is shown that relatively good predictions can be achieved for the cyclic data, but poor correspondence with monotonic data is observed for both models. The reasons for this discrepancy are investigated leading to some remarks about principal limitations of the models. Further it is shown that thermally activated nonelastic strains may be accumulated if Walker's model is applied to thermal loading histories. © 1990.