Models of elasto-viscoplastic behaviour of structures under dynamic load

The comparative analysis of the dynamic behaviour of elasto-viscoplastic structures with the Perzyna, Chaboche and Bodner-Partom constitutive models representing two theoretical different approaches to viscoplastics problems is presented. It has been noticed that in the dynamic domain these models, for the same material, for them the material parameters can be found in literature, gave results with important differences. The analysis of the problem permitted to detect the reason of such differences and to show the ways of avoiding them, So it is possible the comparison of the numerical results obtained with different models for both static and dynamic cases.