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| Load Conversion of Vibration Fatigue Test Based on Damage Equivalence |
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| DOI：10.7643/issn.1672-9242.2022.09.001 |
| KeyWord:vibration fatigue damage equivalent harmonic excitation spectral response accelerated fatigue test |
| Author | Institution |
| YIN Xiang-hong |
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| WANG Ke |
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| CHEN Guo-ping |
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
| YANG Li-bing |
State Key Laboratory of Mechanics and Control of Mechanical Structures, Nanjing University of Aeronautics and Astronautics, Nanjing , China |
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| Abstract: |
| The purpose of this paper is to use simple harmonic excitation instead of random flat spectrum excitation to carry out vibration fatigue test. This paper calculates the fatigue life of a typical aluminum alloy test piece under simple harmonic excitation and random flat spectrum excitation by finite element simulation, and analyzes the equivalent relationship of the two kinds of excitation when the life of the test piece is equal under the two working conditions. Then the paper carries out a set of constant frequency excitation tests and a set of spectral excitation tests to verify the feasibility of using simple harmonic excitation instead of random flat spectral excitation to carry out vibration fatigue test on a typical aluminum alloy test piece by comparing the test results. Through the study of the vibration fatigue life law of 2024-t4 aluminum alloy test piece under certain frequency non-resonant simple harmonic excitation and random straight spectrum excitation with test and simulation technology, this paper obtains the equivalent relationship of load when the test piece has the same life under different excitation. Based on damage equivalence, simple harmonic excitation can be used to replace random straight spectrum excitation in vibration fatigue test in engineering, so as to solve the problem of difficult loading of a kind of vibration fatigue test and realize the acceleration of vibration fatigue test. |
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