摘要:
采用中性盐雾条件模拟海洋大气环境进行加速老化试验, 评价玻璃纤维增强环氧改性酚醛树脂基复合材料( GFRP) 在海洋气候中的耐久性。通过该复合材料经盐雾老化后的质量变化和纵向拉伸强度、横向拉伸强度、压缩强度、层间剪切强度的变化, 结合湿热老化机理, 研究其老化规律。结果表明, 随着老化时间的增加, 复合材料的吸湿量增加, 力学强度下降, 压缩和层间剪切曲线表现出塑性特征。吸湿最初阶段对力学性能影响最大, 纵向拉伸强度、横向拉伸强度、压缩强度、层间剪切强度分别下降到56. 1 %、54. 7 %、54. 0 %、61. 0 %。其中拉伸强度变化趋势最稳定, 更适用于评价该复合材料的老化程度。
关键词:
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玻璃纤维
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树脂
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复合材料
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盐雾
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力学性能
Abstract:
The accelerated salt-spray test was used to simulate a marine environment and determine the durability ofglass fiber reinforced polymer ( GFRP) composites in marine environment s. Aging behavior af ter exposure in saltspray environment was studied by changes in mass gain and mechanical properties including tension , compressionand interlaminar shearing st rength. The mass gain increases and the mechanical properties decrease with the agingtime. Curves of the compression and interlaminar shearing test show more plastic than the original ones. Mechanicalproperties decrease quickly in the initial period of moisture absorption. The longitude tensile st rength , transversetensile st rength , compression strength and interlaminar shearing strength decrease to 56. 1 %, 54. 7 %, 54. 0 %, 61. 0 %,respectively. The tensile strength is more steady and more suitable for evaluating the aging degree of the composites.
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