Life Prediction And Endurance For Different Materials Under The Condition Of Creep And Fatigue Interaction

In order to ensure the safety and reliability of high temperature materials, the effect of creep-fatigue interaction on performance of high temperature materials must be taken into consideration. Thus, the life prediction model under the condition of creep-fatigue interaction is of great importance. This paper reviews the history of life prediction method with respect to creep-fatigue interaction. Some important parameters, which influence the life of materials due to creep-fatigue interaction, for instance, temperature, strain range, hold time, etc., are investigated and some relationships can be found on the basis of the data from the open literature. The accuracy and applicability of different life prediction models are studied in this paper. With regard to numerous creep-fatigue life prediction models have been proposed over the past half-century, a novel approach on the basis of Bayesian Information Criterions is applied to select the best model and estimate the capacities of life prediction model. By comparing with standard deviation, BIC got a well-established on critique life prediction models. In the process of analysis existing data, some relationships can be found on the basis of the data from the open literature, for instance, the relationship of actual life and hold time, the relationship of actual life and temperature, etc. On the basis of those relationships, a new various parameters liner regress phenomenological life prediction model is proposed. A lot of creep-fatigue data of different materials is used to verify new life prediction model and obtain a satisfied result. Hence, the research in this thesis could provide some important insight on development of designing methodology, life prediction and safety evaluation for high temperature materials and components.