文献类型：期刊文献

英文题名：A novel creep-fatigue life evaluation method for ceramic-composites components

作者：Liu, Changqi[1];Shi, Duoqi[1];Zhang, Bo[1];Yang, Xiaoguang[1];Chen, Haofeng[2,3]

机构：[1]Beihang Univ, Sch Energy & Power Engn, Beijing 100191, Peoples R China;[2]Univ Strathclyde, Dept Mech & Aerosp Engn, Glasgow G1 1XJ, North Ireland;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Shanghai 200237, Peoples R China

年份：2023

卷号：249

外文期刊名：INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES

收录：;EI(收录号：20231013692389);WOS:【SCI-EXPANDED(收录号:WOS:000962301100001)】；

基金：This work was supported by the National Natural Science Foundation of China (51772009, 52150710540 and 51911530201) , the Post- doctoral Research Foundation of China (2022M720352) , and the Opening Project of Science and Technology on Advanced Functional Composite Laboratory (6142906220202) .

语种：英文

外文关键词：Ceramic matrix composites; High-temperature fatigue; Creep; Micromechanics; Life prediction

摘要：A novel progressive creep-fatigue damage analysis method based on multiscale information was proposed to accurately predict the service life of SiC/SiC composites and their structural components under complex mechanical loads and external environments. First, the strength degradation of SiC fibers involving five damage mechanisms and degradation of the properties of the interface under high-temperature fatigue loading were described quantitatively based on experimental results. Subsequently, a micromechanical model incorporating the global load sharing model, two-parameter Weibull model, shear-lag model, property degradation models of various constituents, and the effect of the braiding angle was utilized to calculate the volume fraction of broken fibers. The fatigue life of 3D 4-directional SiC/SiC composites was predicted and exhibited a trend similar to that of the experimental data. The rupture life of the SiC/SiC composites was calculated considering the stress transfer among microscopic constituents and the influence of creep slow crack growth on the fiber strength. The volume fraction of broken fibers obtained in these micromechanical models was used to perform a gradual strength degradation in the novel progressive creep-fatigue damage analysis method. Microscopic constituents damage and macroscopic property degradation were quantitatively linked in this step. This infuses the micro information into the traditional phenomenological progressive damage method. The gradual stiffness degradation rules were derived from the fitting of the residual elastic modulus obtained from the fatigue and creep experiments. Finally, the damage evolution and service life of SiC/SiC turbine blades were simulated and evaluated as a preliminary validation of the entire process.