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对比研究了环氧5228A树脂及碳纤维/环氧5228A树脂复合材料层合板在3种湿热环境(水煮、70℃水浸,70℃85%相对湿度)下的湿热性能,考察了湿热条件对复合材料层间剪切性能的影响规律,并从吸湿特性、物理化学特性、树脂力学性能、湿应力等方面分析了不同湿热环境下复合材料性能衰减的机制。研究表明,碳纤维/高温固化环氧树脂复合材料层间剪切性能主要是由吸湿率决定,相同吸湿率不同湿热条件下性能的下降幅度基本相同;3种湿热条件下该树脂及其复合材料未发生化学反应、微裂纹等不可逆变化,复合材料层合板湿热老化机制主要是吸入水分后基体增塑和树脂、纤维湿应变不一致导致的湿应力对复合材料性能的负面作用。
The wet-heat properties of epoxy 5228A resin and carbon fiber / epoxy 5228A resin composite laminates were compared under three hot and humid environments (boiled, 70 ℃ water immersion, 70 ℃ 85% relative humidity) The influence of moisture content, physical and chemical properties, resin mechanical properties and wet stress on the shear properties of the composite materials was analyzed. The mechanism of the composite material performance degradation under different wet and hot environments was analyzed. The results show that the interlaminar shear properties of the carbon fiber / high temperature cured epoxy composites are mainly determined by the moisture absorption rate, and the decrease of the performance under the same moisture absorption rate is basically the same. Under the three wet and heat conditions, the resin and its composites Chemical reaction and microcrack change irreversibly. The wet-heat aging mechanism of composite laminates is mainly due to the negative effect of wet stress on the properties of composites caused by plastic deformation of matrix and resin after wetting moisture.