The general author‘s mesomechanical model with tensorial internal variables is applied to creep of steel 0,5Cr0,5Mo0,3V under different loading levels. It is shown that the creep process can be described by the mesomechanical model in its whole course up to rupture. However, the model parameters can be influenced at the very beginning by the application of the applied load if it is high enough to cause changes in the internal structure. This problem is specific for creep at high temperatures and significant differences in the loading levels (contrary to the small-strain plasticity studied usually at low temperatures, where the model parameters can be considered the same for different loadings). and Obsahuje seznam literatury
Author‘s general mesomechanical concept is applied to explanation of the physical background of the phenomenon of springback and to its modeling. The internal elastic stress field in the material is modeled on the mesoscale and the variations of this field clarify the main features of springback that are observed experimentally in the process of loading, unloading and loading-free creep. Attention is not paid to minute description of the stress-strain diagram appearing in the course of unloading, but to the value of the residual strain after unloading, which is important from the technical point of view. It is shown how creep after unloading depends on stored energy. and Obsahuje seznam literatury a názvosloví