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| Experimental Study on Rapid Aging of Tethered Balloon Envelope Materials |
| Received:January 29, 2019 Revised:July 25, 2019 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/ issn.1672-9242.2019.07.005 |
| KeyWord:tethered balloon envelope material solar radiation tensile strength service life |
| Author | Institution |
| ZHANG Zhi-fu |
No. 38 Research Institute of CETC, Hefei , China |
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| Abstract: |
| Objective To estimate the service life of a tethered balloon in a certain area. Methods The influences of envi-ronmental factors on tethered balloon were analyzed, and the method of rapid aging by solar radiation was determined to carry out aging test research on envelope materials. The time was 3000 hours. The test pieces were tested by the equal time interval method, with an interval of 375 hours and 9 tests. Each group of test pieces consisted of 5 pieces. The arithmetic average value of 5 test pieces was used to the test. The surface condition, tensile strength, change rate of tensile strength and elongation at break of the envelope material before and after aging were analyzed. Results After the test, the surface of the envelope material was yellow and had powdery particles, the tensile strength was 395.2 N/cm, which was decreased by 56.01%. And the elongation at break changed with time, ranging from 3.9%-7.7%. The laboratory aging radiation was equivalent to the outdoor ultraviolet radiation. According to the outdoor ultraviolet radiation accounting for about 8% of the outdoor natural aging solar radiation and the annual total solar radiation in a certain area, the laboratory aging of the envelope material was estimated to be equivalent to the outdoor natural aging time. The service life of the tethered balloon was evaluated according to the design restrictions of the envelope material. Conclusion The service life of a tethered balloon in a certain region can be estimated according to the aging test research with the method of rapid aging by solar radiation. |
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