文献类型：期刊文献

英文题名：System-level creep-fatigue reliability evaluation by engineering damage mechanics incorporating cumulative damage-damage threshold interference

作者：Gu, Hang-Hang[1];Wang, Run-Zi[1];Zhang, Kun[1];Wang, Ji[1,3];Sun, Li[1];Li, Kai-Shang[1];Liu, Yu[2];Zhang, Xian-Cheng[1,3];Tu, Shan-Tung[1]

机构：[1]East China Univ Sci & Technol, Key Lab Pressure Syst & Safety, Minist Educ, Shanghai 200237, Peoples R China;[2]Univ Elect Sci & Technol China, Sch Mech & Elect Engn, Chengdu 611731, Peoples R China;[3]East China Univ Sci & Technol, Sch Mech & Power Engn, Key Lab Pressure Syst & Safety, Minist Educ, Meilong Rd 130, Shanghai 200237, Peoples R China

年份：2023

卷号：176

外文期刊名：INTERNATIONAL JOURNAL OF FATIGUE

收录：;EI(收录号：20233114458669);WOS:【SCI-EXPANDED(收录号:WOS:001051672400001)】；

基金：Acknowledgement This work was supported financially by the National Key Research and Development Program (Grant No. 2022YFB4602100) , National Natural Science Foundation of China (Nos. 52005185, 51725503 and U21B2077) , and Young Elite Scientists Sponsorship Program by CAST (YESS20200029) .

语种：英文

外文关键词：Creep-fatigue; Reliability evaluation; System-level; Turbine disk; Surrogate model

摘要：Reliability assessment for structural system is of great significance in ensuring system safety, providing a scientific guidance for life management. In this work, a creep-fatigue reliability modeling method is developed for system-level perspective on the basis of cumulative damage-damage threshold interference. Probabilistic damage accumulations to given loading cycles are associated with the creep-fatigue models considering multi-source uncertainties and the damage threshold is regarded as a random variable. Particularly, a numerical procedure is proposed for practical application in engineering by combining the Monte Carlo simulation with Gaussian process regression-based surrogate model. Furthermore, a low-pressure turbine disk under creep-fatigue loading condition is taken as an instance to evaluate its reliability considering multiple weakness sites. Results show that the proposed method is better than the independent treatment because it is capable of avoiding the overly-conservative reliability estimation. In addition, the influence of damage summation rules and damage threshold on reliability is quantitatively analyzed in terms of the developed method. The effect of random parameters in structural system on computational efficiency of the proposed numerical procedure is investigated.