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| Impact damage evaluation of large volume glass fiber wrapped gas cylinder based on AE technology |
| LUO Hui, LI Tong, HUANG Qianghua, BO Ke, CHAI Sen, LI Xiang |
| China Special Equipment Testing and Research Institute, Beijing 100029, China |
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Abstract Through the step-up hydrostatic burst test of large-volume glass fiber wrapped composite cylinders, the acoustic emission technology was used to monitor the wrapped layer damage evolution behaviors during the step-up burst process and the acoustic emission signal response characteristics at different stages of boosting. The amplitude, count, cumulative count, and energy of acoustic emission signals in different stages were obtained. When the test pressure increased from 40 MPa to 50 MPa, the wrapped layer was damaged, the acoustic emission signal activity increases by about 90 times, and the fiber breaking signal strength was high, reached 1.0×108 aJ. On this basis, through the hydrostatic burst test of cylinders with different degrees of impact damage, the difference in acoustic emission response of cylinders with different damages in the 0-30 MPa stage was compared and analyzed. The test results show that the acoustic emission signal of the wrapped layer increased with the increase of the wrapped layer damage degree, and the signal activity and intensity increased. The signal activity of the wrapped layer of the critically damaged cylinder increased by 20 times, and the signal intensity reached 2.0×105 aJ. Therefore, during the hydrostatic test, the safely of impact damage of composite cylinder could be evaluated by compared the characteristics of the acoustic emission signal amplitude and count of the impact damage area and critical damage wrapped layer.
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Received: 03 November 2021
Published: 15 March 2023
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