Research on Creep Damage and Life Forecast of Rod Fastening Rotor Based on Damage Mechanics

2016 2nd International Conference on Mechanical and Aeronautical Engineering (ICMAE 2016)

机械制造;航空航天工程

Qiang, Liu^1,2 ; Ai-Lun, Wang^1,2

State Key Laboratory of High Performance Complex Manufacturing, Central South University, Changsha

410083, China^1

School of Mechanical and Electrical Engineering, Central South University, Changsha

410083, China^2

关键词: Contact effect;    Damage mechanics;    Equivalent stiffness;    Life predictions;    Nonlinear process;    Performance degradation;    Rod fastening rotors;    Virtual materials;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/187/1/012031/pdf
DOI  :  10.1088/1757-899X/187/1/012031

学科分类：航空航天科学

来源: IOP

【 摘 要 】

Rod fastening rotor (RFR) is the core part of gas turbine, the degradation of RFR has great effect on gas turbine's performance. One of the main reasons which cause the RFR performance degradation is creep damage, while few studies have been carried out in terms of it so far. In order to analyze the influence of preload on virtual material parameters, a dynamic model of RFR considering interface contact effect was built. Then equivalent stiffness of RFR and elements was analyzed as well. Furthermore, creep damage of elements under higher stress were analyzed with damage mechanics to get their influence on the total damage. Likewise, RFR were analyzed with damage mechanics to get the connection between the total damage and rupture life. The results showed that connection between the total damage and rupture life was a complicated, non-linear process. Moreover, the rods of turbine and combustion chamber were the biggest influencing factors. The results of this dissertation can be a support for structural design and life prediction of RFR.