Parametry funkcji opisujących relaksację naprężeń jako wskaźniki uszkodzenia struktury materiału

On the basis of exponential and cooperative rheological models it lias been shown that the parameters apearing in these models when describing the stress relaxation are good indicators of a structure damage. As an example the stress relaxation in tensile uniaxial state in polypropylene has been used. The stress relaxation descriptions realized by different models (also newly introduced cooperative models) in metallic and nonmetallic materials has been compared.