High-Temperature Creep and Long-Term Strength of Metallic Materials

Abstract

The article consideres the loosening of metallic materials and an irreversible change in density during high-temperature creep is considered as damage parameter. On the basis of this parameter and taking into account the law of mass conservation, interrelated equations for creep deformation and damage parameter are proposed. Approximate and exact solutions for creep deformation and continuity parameter are obtained and criteria for long-term strength are formulated. The corresponding theoretical curves are constructed. It is shown that the theoretical relationships for the damage parameter describe the experimental results on the density change during the high-temperature creep of various metallic materials well.