CREEP AND RELAXATION MODELED ON THE MESOSCALE

摘要

The general mesomechanical model of the first author is applied to the description of creep and relaxation. Although the material properties and internal microstructures of different materials are different, the curves of creep and relaxation are usually very similar. Our model tries to grasp the common mesomechanical features that are responsible for the character of these curves. The method of determination of the model parameters is presented and exemplified. It is shown that with appropriate model parameters, the-experimental creep curve of the material chosen for demon-stration can be described very closely. The theoretical diagrams for different kinds of prescribed loading and constraint of deformation qualitatively agree with what is generally observed. It is hypothesized that the limited capacity of the material with regard to the comprised elastic energy described on the mesoscale could serve as the criterion of strength.