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| Response Calculation and Fatigue Life Prediction of Thin-walled Conical Shell Structures under Thermal-acoustic Complex Environment |
| Received:July 25, 2018 Revised:December 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.12.017 |
| KeyWord:thermal-acoustic environment conical shell structure fatigue life coupled FEM/BEM method improved rain flow counting method |
| Author | Institution |
| WANG Jian |
1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu , China |
| SHA Yun-dong |
2. Liaoning Key Laboratory of Advanced Test Technology for Aeronautical Propulsion System, Shenyang Aerospace University, Shenyang , China |
| DU Ying-jie |
1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu , China |
| GU Song |
1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu , China |
| SUN Zhi-chao |
1. Department of Aircraft Maintenance Engineering, Chengdu Aeronautic Polytechnic, Chengdu , China |
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| Abstract: |
| Objective To study dynamic response and fatigue life of thin-walled conical shell structures in a thermal-acoustic complex environment. Methods The coupled finite element/boundary element (FEM/BEM) method was used to calculate the vibration stress under different thermal-acoustic loads. Based on the improved rain flow counting method, the fatigue life of the dangerous points and typical locations under different thermal-acoustic loads were estimated. Results The fundamental frequency of the thin-walled conical shell structure decreased firstly with the increase of the temperature before bending and then increased in certain temperature range after bending. The stress concentration of the thin-walled conical shell structure mainly occurred at the edge of the hole. The fundamental frequency played a dominant role in the thermal-acoustic excitation response. There were large peaks at the low-order natural frequencies and small peaks in the high-order frequency band with high modal density. Conclusion In thermal environment from 800 ℃ to 1000 ℃, the fatigue life can only be reached for a few hours, when the structures bear the strong acoustic loads. Hence, in the anti-acoustic fatigue structural design, the frequency distribution of the response spectrum should be considered, and it is important to pay more attention to design of structural hole edge. |
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