| DING Kunying,PEI Xiangzhong,LIU Zijian,WANG Mengxiao,JIA Zhihao.Calculation and Optimization of Impact and Wear Forces of Engine Sealing Coatings Based on Hertz Contact Model[J],53(5):184-193 |
| Calculation and Optimization of Impact and Wear Forces of Engine Sealing Coatings Based on Hertz Contact Model |
| Received:May 25, 2023 Revised:November 15, 2023 |
| View Full Text View/Add Comment Download reader |
| DOI：10.16490/j.cnki.issn.1001-3660.2024.05.019 |
| KeyWord:sealing coating atmospheric plasma spraying high speed impact and wear hertz model friction heating optimization coefficient |
| Author | Institution |
| DING Kunying |
Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin , China |
| PEI Xiangzhong |
Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin , China |
| LIU Zijian |
Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin , China |
| WANG Mengxiao |
Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin , China |
| JIA Zhihao |
Tianjin Key Laboratory of Civil Aircraft Airworthiness and Maintenance, Civil Aviation University of China, Tianjin , China |
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| Abstract: |
| The aircraft engine sealant coating can effectively improve the air tightness of the aircraft engine and improve the fuel utilization efficiency. However, due to the existence of friction between the blades and the coating, the coating often peels off and causes damage to the blades, resulting in economic losses. Therefore, it is necessary to analyze the friction between the blade and the coating. In this paper, four kinds of aluminum-silicon polyphenylene ester sealed coatings with different polyphenylene ester contents were prepared by atmospheric plasma spraying (APS). The hardness and elastic modulus of the coatings were obtained by a hardness test and an elastic modulus test, and the cross-sectional microstructures of the four coatings were observed with a scanning electron microscopy (SEM). It was found that the hardness of the coatings was related to the non-metallic phase content of the coatings. More pores, cracks and polyphenylene ester content resulted in smaller coating hardness, and the elastic modulus of the coatings increased with the increase of coating hardness. A high-speed bruising test machine was used to analyze the bruising force between the blade and the coating, and four bruising conditions were designed to conduct high-speed bruising tests on four coatings and the maximum normal bruising force during the bruising process was recorded; the maximum normal contact load on the coating during the bruising process was calculated based on the Hertzian contact model. The test values of the high speed contact test were compared with the theoretical calculated values, and it was found that the calculated values of the Hertzian contact model were always larger than the test values. In order to make the Hertzian contact model more accurate for the calculation of the contact force between the blade and the coating, the coefficients of the contact coefficient in the Hertzian contact model were optimized. The coefficients Δ β of the Hertzian contact model were optimized according to the adhesion of the blade tip and the average line roughness of the coating surface after the grinding test by means of a laser confocal microscope and a scanning electron microscope. The elasticity coefficients E in the Hertzian model were optimized by the effect of temperature change on the elastic modulus of the coating material during the bruising process. The optimized coefficients were substituted into the Hertzian contact model to recalculate the maximum normal contact load on the coating during the high speed bruising process, and the results of the optimized Hertzian contact model, the results of the Hertzian contact model before the optimized coefficients and the high speed bruising test values were compared. The results show that the actual contact between the blade and different coatings and the thermal aggregation effect caused by high blade speed are the main reasons for the deviation between the calculated results before the optimized factor and the test values. The Hertzian model after the optimization factor is closer to the experimental test value than the Hertzian model before the optimization factor, and the deviation from the test value is within 1%-11%. The reason for the deviation may be related to the coupling effect between the tangential force and the normal force. |
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