Prediction method for creep inoculation period considering constraint effect under steady-state creep condition

Abstract

The invention discloses a prediction method for a creep inoculation period considering a constraint effect under a steady-state creep condition. A corrected prediction model for the creep inoculationperiod under the steady-state creep condition is provided; a ductility exhaustion damage model is utilized; a constraint parameter Q is introduced; and the creep inoculation period considering the constraint effect is calculated. A creep simulation experiment is carried out by applying a main load by using a compact tensile sample (CT), and the creep inoculation period under a plastic condition can be concisely and effectively predicted in a structure. The method has the beneficial effects that the simplified prediction method for the creep inoculation period under the steady-state creep condition is provided, so that the creep inoculation period under the plastic condition can be concisely and effectively predicted in the structure.

Description

technical field [0001] The present invention relates to the engineering critical evaluation of the creep incubation period of a high-temperature structure considering the restraint effect under the condition of steady-state creep, which is to determine when there are surface cracks in the structure and it is under the condition of steady-state creep stress, to evaluate the high-temperature structure Creep crack initiation life. Background technique [0002] The coal-based energy structure is one of the main causes of smog in my country, and coal-fired power generation is currently the most important power generation method in my country, and this trend will exist for a long time. Therefore, in addition to changing the energy structure, developing efficient and clean ultra-supercritical (USC) units is one of the important ways to save energy and reduce emissions. However, the increase of parameters such as steam temperature and pressure has led to a very harsh service enviro...

AI Technical Summary

Problems solved by technology

The creep incubation period is the longest stage in the creep process, and the accurate prediction of the incubation period is of great significance for the prediction of the creep life of high-temperature structures; the incubation period prediction model proposed by Davies et al. based on the ductile dissipation model considers The integrity of the stress change in the creep process, but the influence of the restraint effect of the structure on the incubation period has not been studied; in recent years, researchers have conducted a lot of research on the influence of the restraint effect on the growth of creep cracks

Images