GB/T 43103-2023 specifies methods for the quantitative assessment of damage and life prediction of metallic materials (particularly applicable to critical components in high-temperature service, such as gas turbine and aero-engine blades) under the interaction of creep and fatigue loads. This standard provides various engineering assessment models and calculation procedures to determine the safe service life of materials under complex load spectra. The associated life assessment typically does not rely on a single instrument but is based on raw data obtained from material mechanical tests (e.g., high-temperature creep testing machines, fatigue testing machines) and component stress analysis, which are then calculated and synthesized according to the methods specified in this standard.