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| Design and Analysis of Test Pieces for Static and Dynamic Combined Fatigue of a Beam Structure |
| Received:June 07, 2018 Revised:September 25, 2018 |
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| DOI：10.7643/ issn.1672-9242.2018.09.003 |
| KeyWord:vibration fatigue nominal stress method linear cumulative damage fatigue life prediction |
| Author | Institution |
| ZHANG Ying |
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| WANG Ke |
College of Aerospace Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| Objective To solve the difficult problem of estimating fatigue life of engineering structure under joint action of alternating static and dynamic loads. Methods A beam structure test piece was designed to facilitate the application of static and dynamic loads, and have a suitable fatigue life for fatigue life prediction under static and joint load. The nominal stress method was used to calculate the life of the structure under static load. The frequency domain method was used to calculate the life of the structure under dynamic load alone. Based on the linear damage accumulation theory, the static load combined load was calculated in units of the load block. Results The test load was given initially. The service life of static and dynamic load under combined loading dangerous point of was 1225 s. Specimen failure was within 1 h, and met the design requirements. Conclusion The method can be used to check the actual life of the specimens, in order to design specimen. |
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