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| Long Term Aging and Failure Behaviors of Polymer Composites in Simulated Marine Environments |
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| DOI：10.7643/issn.1672-9242.2023.06.009 |
| KeyWord:glass fibre reinforced polymer composites simulated aging mechanical properties corrosion behaviors failure mode unsaturated polyester vinyl ester |
| Author | Institution |
| WANG Deng-xia |
Shandong Institute of Non-metallic Materials, Jinan , China |
| XIE Ke-yong |
Shandong Institute of Non-metallic Materials, Jinan , China |
| LIU Jun-cong |
Shandong Institute of Non-metallic Materials, Jinan , China |
| AN Qi |
Shandong Institute of Non-metallic Materials, Jinan , China |
| WANG Xin-bo |
Shandong Institute of Non-metallic Materials, Jinan , China |
| ZHONG Yong |
Southwest Institute of Technology and Engineering, Chongqing , China |
| DING Kang-kang |
725th Institute of China Shipbuilding Industry Corporation, Shandong Qingdao , China |
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| Abstract: |
| Two kinds of resin based lightweight composites:glass fiber reinforced unsaturated polyester (GF/197S) and glass fiber reinforced vinyl ester (GF/905-2) were selected to carry out accelerated tests in simulated marine environment of salt spray aging, hydrothermal aging and salt water immersion for 9 600 h in laboratory. The effects of the three aging environments on properties of the GFRPC showed that the failure sequence of the three aging methods on the composites was 70℃/95% RH (relative humidity), 35 ℃ salt spray, normal temperature salt water immersion. Deterioration behaviors of GFRPC were studied based on various mechanical properties. The tensile strength, flexural strength, compressive strength and interlaminar shear strength of materials changed significantly with the aging hours. The tensile strength of GF/197S, mainly reflecting reinforced fiber performance, decreased slowly with the aging time, while the compressive and shear properties, which reflected the matrix resin performance, decreased dramatically firstly and then increased with the aging time. For vinyl ester based composites, the tensile properties decreased slowly with the aging time, while the compressive and shear properties maintained firstly and then decreased rapidly with the aging time. Fourier transform attenuated total reflection infrared spectroscopy (ATR-FTIR) was used to analyze the changes of resin matrix with the aging time. The fracture morphology of tensile failure samples was observed by a camera and analyzed by a SEM. At the same time, the change of resin/fiber interface of the bending destruction sample was detected by ultrasonic scanning imaging for the first time. The two detection results clearly showed that the main failure mode in the bending destruction process was resin debonding from fiber. The effects of three accelerated aging methods on the thermal properties of GFRPCs were analyzed by differential scanning calorimetry (DSC) and thermogravimetric analysis (TG). The results showed that the decrease of glass transition temperature (tg) caused by thermal environment mainly led to the decrease of compressive and shear strength of GFRPCs. Failure process of GF/197S in tensile destroy process in hydrothermal atmosphere is as follows:resin debonding from fiber in early aging stage followed by resin degradation in later aging stage. The failure mode of tensile destroy process of GF/905-2 in hydrothermal atmosphere is as follows:the resin fiber is pulled out from the resin mass in the early aging stage, and the resin begins to degrade in the later aging stage. The research results of aging behavior, degradation mechanism and failure mode of two advanced lightweight resin matrices under simulated marine environment lay a foundation for environmental adaptability evaluation and service life prediction of high-performance resin matrix composites. |
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