Lately due to advancement of materials, structures and modeling capacities demand for 3D nonlinear material models implemented in commercial software’s and codes have increased. In order to obtain such implemented model, firstly the model itself and the methodology for experimental parameter identification have to be established. The overall goal is to create a 3D material model, that could account for viscolpasticity, viscoelasticity and damage. Within this study the viscoplastic behavior in axial and lateral direction will be analyzed, thus obtaining the materials 3D viscoplastic behavior. Experimental data for various materials are analyzed. The results showed that viscoplastic strain has the same time and stress dependency in axial and lateral direction. The only difference is in the ration of axial and lateral strain, which is characterized by a single multiplication factor within viscoplastic material model.