Fatigue Reliability Analysis of a Turbine Blade Under CCF Load
- PDF / 721,930 Bytes
- 7 Pages / 595.276 x 790.866 pts Page_size
- 83 Downloads / 231 Views
TECHNICAL ARTICLE—PEER-REVIEWED
Fatigue Reliability Analysis of a Turbine Blade Under CCF Load Guang-Jun Jiang . Zong-Yuan Li . Jiang Liu . Hong-Xia Chen . Hong-Hua Sun . Zhi-Yong Yue
Submitted: 4 May 2020 Ó ASM International 2020
Abstract The severity of failure consequences of turbine blades, e.g., aero engine turbine blades, is critical which calls for comprehensive reliability analysis as a basis of that to ensure safe operations. Hence, in order to analyze the fatigue reliability of turbine blades subjected to combined high and low cycle fatigue (CCF), a fatigue reliability analysis is conducted in this study. Initially, the uncertainties related are considered by determining the distributions of strength as well as load parameters. Subsequently, a dynamic reliability model is established by using strength damage interaction method from fatigue accumulation perspective, in which the load spectrum of CCF test is applied. The validation of the proposed method is carried out by a numerical example of turbine blades. The results indicate that the model proposed is capable for quantitatively analyzing the effects of variation in stress and strength parameters on fatigue reliability of turbine blades. Keywords CCF Dynamic reliability analysis Damage accumulation Turbine blade
Introduction The reliability and safety of turbine blades, for instance, aero engine turbine blades, are of great importance than ever for failure consequences of those items are increasingly severe. However, the functional and failure
G.-J. Jiang Z.-Y. Li J. Liu (&) H.-X. Chen H.-H. Sun Z.-Y. Yue School of Mechanical Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China e-mail: [email protected]
correlation between turbine blades has always been one of the main difficulties for conducting comprehensive reliability analysis for those items [1–3]. Conventional analysis and calculation of system reliability under independent assumptions will lead to unneglectable errors; meanwhile, the stress–strength interference (SSI) model, a mature and typical tool for the reliability analysis in such sectors, ignores the diversities of stress and strength of turbine blade and their dynamic features over time [4–6]. In the engineering practice, however, the load as well as the strength of turbine blades varies with time and the correlation between them is nonlinear. Moreover, the nonlinear relationship would impact on the reliability analysis results of turbine blades and their upper systems. Based on the SSI model, reliability model of single mechanical component can be developed, but the reliability calculated is larger than the actual when the strength degradation is failed to be taken into account [7]. Accordingly, the investigations of the reliability of turbine blades under various features of load and strength are of great need which can lead to a more precise reliability analysis result. For instance, Qin et al. [8] analyzed the dynamic reliability of the transmission system of wind turbin
Data Loading...
