| HU Dian-yin1,2,3, ZHANG Ze-bang4, ZHANG Long1, MEI Wen-bin1, WANG Rong-qiao1,2,3.Fatigue Life Prediction Method for Ceramic Matrix Composites[J].航空发动机,2017,43(4):17-22 |
| Fatigue Life Prediction Method for Ceramic Matrix Composites |
| DOI： |
| Key Words:ceramic matrix composites fatigue life hysteresis loop S-N curves |
| Author Name | Affiliation | E-mail | | HU Dian-yin1,2,3, ZHANG Ze-bang4, ZHANG Long1, MEI Wen-bin1, WANG Rong-qiao1,2,3 | 1. School of Energy and Power Engineering, Beihang University, Beijing 100083, China
2. Beijing Key Laboratory of Aero-Engine
Structure and Strength, Beijing 100083, China
3. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100083, China
4.
Systems Engineering Research Institute, Beijing 100094, China | hdy@buaa.edu.cn |
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| Abstract:In order to establish fatigue life prediction method for Ceramic Matrix Composites and expand its application in aeroengine,
this work investigates that the CMC may appear four different kinds of fatigue hysteresis behavior under different peak fatigue stresses on
the basis of the BHE shear lag model. The stress and strain formulas of cyclic curves under each kind of hysteretic behavior were deduced.
By comparing with the experimental data, the accuracy of the hysteresis loop simulation was proved, and the degradation of the interfacial
shear stress with the cyclic number was obtained. The failure criterion of the cyclic process was determined by combining the shear stress
degradation model and the fiber strength degradation model, and a numerical method for calculating the stress and fatigue life of the fiber
was designed. According to the results of finite element analysis of a 2D woven CMC, the stress of the fiber was extracted and the fatigue life
of CMC was calculated. The S-N curve of fatigue life of CMC was deduced and the result was in agreement with the experimental data. The
fatigue life prediction method for 2D woven CMC can be employed to fatigue life prediction of the woven CMC turbine vanes. |
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