Analysis of fracture failure of fir-tree serrations of stage II turbine disks |
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| Affiliation: | 1. Failure Mechanics and Engineering Disaster Prevention and Mitigation Key Laboratory of Sichuan Province, College of Architecture and Environment, Sichuan University, Chengdu 610065, China;2. Key Laboratory of Deep Underground Science and Engineering, Ministry of Education, Sichuan University, Chengdu 610065, China;3. State Key Laboratory of Long-Life High Temperature Materials, DongFang Turbine Co., Ltd, Deyang 618000, China;4. DongFang Boiler Group Co., Ltd, Zigong 643001, China;5. Chengdu Push Automobile Mold Co., Ltd, Chengdu 610100, China;6. School of Architecture and Civil Engineering, Chengdu University, Chengdu 610106, China;1. School of Mechanical and Electrical Engineering, University of Electronic Science and Technology of China, Chengdu 611731, China;2. Department of Mechanical Engineering, Politecnico di Milano, Milan 20156, Italy;1. School of Energy and Power Engineering, Beihang University, Beijing 100191, China;2. Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100191, China;3. Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials, Beijing Institute of Aeronautical Material, Beijing 100095, China;4. China Gas Turbine Establishment, Aero Engine Corporation of China, Sichuan 621300, China;1. Surface Engineering Institution, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;2. Aviation Key Laboratory of Advanced Corrosion and Protection on Aviation Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;3. School of Material Science and Engineering, Nanchang Hangkong University, Nanchang 330063, China;4. School of Mechanical Electronic and Information Engineering, China University of Mining and Technology, Beijing 100083, China;5. School of Mechanical Engineering and Automation, Fuzhou University-Qishan Campus, Fuzhou, Fujian 350116, China;6. National Key Laboratory of Advance High Temperature Structural Materials, AECC Beijing Institute of Aeronautical Materials, Beijing 100095, China;1. School of Energy and Power Engineering, Beihang University, Beijing 100083, China;2. Collaborative Innovation Center of Advanced Aero-Engine, Beijing 100083, China;3. Beijing Key Laboratory of Aero-Engine Structure and Strength, Beijing 100083, China;4. Mining and Materials Engineering, McGill University, Montreal, QC H3A 0C5, Canada;5. Experimental School of Beihang University, Beijing 100083, China;6. School of Automation Science and Electrical Engineering, Beihang University, Beijing 100083, China |
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| Abstract: | This paper presents an analysis of fracture failure of fir-tree serrations in stage II turbine disks in a certain type of engine. On the basis of statistical analysis, basic fracture features and fracture mechanisms of stage II turbine disk serrations have been summarized. The reasons for the serration fracture failure are: (a) the first order bending resonance k=5 in the turbine blade occurring at the speed of 9700 rpm; (b) the unreasonable design of the five-serration structure, which causes each serration to bear non-uniform stresses; (c) the disk being made of the alloy GH2036 having a low fatigue resistance; (d) the high intergranular corrosion sensitivity of GH2036. Finally, measures, i.e. the change of the five-serration structure into a three-serration structure and the replacement of GH2036 with GH2132, have been given to prevent the fracture failures, and the application has indicated that these measures are effective. |
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