|
| Fatigue Damage Analysis of Propellant Column in Solid Rocket Motor Based on Compiled Load Spectrum |
| Received:January 25, 2020 Revised:March 31, 2020 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2020.08.002 |
| KeyWord:load spectrum vibration solid rocket motor rainflow counting |
| Author | Institution |
| LIU Lei |
Naval Defense University, Yantai , China |
| LI Gao-chun |
Naval Defense University, Yantai , China |
| LIU Zhu-qing |
Unit 91458, Sanya , China |
| LI Jin-fei |
Naval Defense University, Yantai , China |
|
| Hits: |
| Download times: |
| Abstract: |
| The work aims to establish the long-term vibration load spectrum of solid rocket motor on duty in the sea, and analyze the damage of the propellant column caused by vibration. The partial load of the solid rocket motor on duty was obtained through data measurement. The long-term load spectrum of the motor was compiled by the nonparametric rainflow matrix extrapolation method and the time domain load reconstruction method. The stress distribution of the motor propellant column was established by finite element simulation. The propellant column damage was calculated by Miner’s linear cumulative damage theory. The extrapolated x, y, and z triaxial extreme load values were increased by 51%, 83%, and 115%, respectively. During vibration, the Mises stress inside the propellant column was small, and became larger as closing to the bonding interface. The propellant column near the front and rear heads generated stress concentration. The relationship between propellant stress amplitude and cumulative damage was deduced and the cumulative damage of the column during the single load spectrum period was 1.059×10−4. The nonparametric rainflow matrix extrapolation method and the time domain load reconstruction method can be used to quantitatively characterize the unobserved large-value loads in the measured data, and effectively establish the long-term load spectrum of the solid rocket motor in the sea. When the solid rocket motor is continuously on duty for 6 months, the cumulative damage to the column was 0.0323. |
| Close |
|
|
|