A novel prediction model for temperature-stress dependent creep rupture life in structural ceramics

In this study, based on the Force-Heat equivalence energy density principle and incorporating the theory of dissipated power, a theoretical model has been developed to predict the creep rupture life of structural ceramics. The novelty of this work lies in proposing a critical energy density for the creep rupture of structural ceramics under various temperature-stress combinations, and the life prediction model developed on this basis does not contain any adjustable fitting parameters. The theoretical model has been well verified by a large number of experimental results. Moreover, the model analysis indicates that increasing the fast-fracture strength of structural ceramics is beneficial for enhancing their resistance to creep, with this enhancement being more pronounced at high stress levels or elevated temperatures. This work contributes to a deeper understanding of the performance and reliability of structural ceramic materials throughout their service life under operating temperature conditions.