Method and system for determining critical inelastic strain rate during creep-fatigue damage process

A system for determining a critical inelastic strain rate during a creep-fatigue damage process, comprising:

• a material obtaining module configured to obtain a plurality of identical high-temperature equipment materials;
• a test module configured to, under a same temperature condition, conduct a creep test, a fatigue test, and a creep-fatigue interaction test on the high-temperature equipment materials, respectively, to obtain a creep test result, a fatigue test result, and a creep-fatigue interaction test result;
• a stress relaxation formula establishment module configured to establish a stress relaxation formula based on the creep test result, the stress relaxation formula being configured to calculate a critical stress after correcting a critical inelastic strain rate at an initial stage of strain holding;
• an establishment module for a fitting equation for an inelastic strain energy density at a failure configured to establish a fitting equation for an inelastic strain energy density at a failure based on the fatigue test result, the fitting equation for an inelastic strain energy density at a failure being configured to calculate a corrected inelastic strain energy density dissipation rate and creep damage per cycle;
• a net tensile hysteresis energy-induced fatigue damage equation establishment module configured to establish a net tensile hysteresis energy-induced fatigue damage equation based on the creep-fatigue interaction test result, the net tensile hysteresis energy-induced fatigue damage equation being configured to calculate fatigue damage per cycle;
• and
• a life calculation module configured to determine, according to a linear cumulative damage rule, a creep-fatigue life of the high-temperature equipment materials under creep-fatigue interaction based on the stress relaxation formula, the fitting equation for an inelastic strain energy density at a failure, and the net tensile hysteresis energy-induced fatigue damage equation.