A three-dimensional viscoelastopalstic model for describing the behavior of an isotropic body is constructed based on the data of mechanically testing potassium salt specimens. The model is based on the evolutionary equations for two structural scalar parameters responsible for irreversible changes of the shape and volume of the body. The proposed method of the model identification is based on the results of uniaxial stress and uniaxial strain tests accompanied by registration of all non-zero strain and stress components. Due to the shortage of data the model identification, providing good agreement with the experiment, has been made for the one-dimensional variant of the description of the uniaxial stressed state.
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