ABSTRACT

The creep characteristics, determined in experiments at constant temperatures, can also often be used when evaluating the efficiency of structures at changing temperatures. To determine the dependences describing the creep process, it is usually necessary to use the data obtained in the standard uniaxial tension tests. In the creep test a cylindrical specimen with thermocouples attached to it is secured in the clamps of a loading machine and placed in a furnace. The tensile loading of cylindrical metallic specimens in the high-temperature creep conditions in this approach consists of two consecutive stages. The possibility of using the creep theories for describing the fracture processes can be verified using the results of creep tests with the third stage taken into account. The most promising theory in the mechanics of solid media for describing the creep processes of constructional materials is the concept of the mechanical equation of state, proposed by Yu.N. Rabotnov.