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| Study on the Evolution of Mechanical Properties of Glass Fiber Reinforced Composite in Seawater Environment |
| Received:April 09, 2021 Revised:May 18, 2021 |
| View Full Text View/Add Comment Download reader |
| DOI：10.7643/issn.1672-9242.2021.08.011 |
| KeyWord:glass fiber reinforced composite immersion in seawater mechanical properties |
| Author | Institution |
| LI Jing |
Harbin Electric Machinery Company Limited, Harbin , China;State Key Laboratory of Hydropower Equipment, Harbin , China |
| GE Guang-nan |
Harbin Electric Machinery Company Limited, Harbin , China;State Key Laboratory of Hydropower Equipment, Harbin , China;School of Material Science and Engineering, Harbin Institute of Technology, Harbin , China |
| JIA Peng-gang |
Harbin Electric Machinery Company Limited, Harbin , China;State Key Laboratory of Hydropower Equipment, Harbin , China |
| ZHAO Peng |
Harbin Electric Machinery Company Limited, Harbin , China;State Key Laboratory of Hydropower Equipment, Harbin , China |
| HOU Shi-pu |
Harbin Electric Machinery Company Limited, Harbin , China;State Key Laboratory of Hydropower Equipment, Harbin , China |
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| Abstract: |
| The variation of mechanical properties of glass fiber reinforced composite for blades of marine current power generation units under artificial seawater was studied. In the laboratory, the water absorption characteristics of glass fiber reinforced polymer matrix composites for blades and the evolution of mechanical property parameters in the artificial seawater medium were investigated by seawater immersion test, tensile test, bending test and shear test. The results show that the water absorption of glass fiber reinforced polymer matrix composite increases initially and then gradually becomes stable with the increase of immersion time, and the final water absorption is about 0.075%. The tensile strength first decreases and then increases, and later it resumes decrease, while the maximum tensile strength can reach 1100 MPa and the minimum value is about 940 MPa. However, the elastic modulus and bending strength decrease gradually, and the decrease rates are about 9.5% and 30% respectively. The change range of bending modulus is within 15%. The shear strength of the material first increases and then decreases, with the minimum shear strength being 189 MPa, 10 MPa higher than the initial value. The shear modulus first decreases and then increases, and it decreased the lowest value, 16.4 GPa, after 28 d immersion. After immersion in seawater for a long time, the tensile and shear strength of the glass fiber reinforced resin matrix composites are slightly reduced, but the reduction is not large, while the bending strength are obviously reduced. Therefore, the negative effect of the degradation of the bending properties should be fully considered in the structural design and strength calculation of the blades. |
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