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研究了碳纤维/双马复合材料单向层板在三点弯曲载荷作用下70℃水浸的湿热特性,测试分析了层板的吸湿量、玻璃化转变温度、弯曲性能及其破坏模式随湿热时间的变化,通过对比研究弯曲载荷作用和无外载荷条件下层板湿热性能的差异,探讨了应力对复合材料湿热行为的作用规律。结果表明:弯曲载荷作用下试样整体的吸湿规律、剩余弯曲性能等方面与未加载情况相比没有显著差异,但弯曲加载试样吸湿饱和前相同吸湿率时玻璃化转变温度下降更多;弯曲加载试样受压应力部分吸湿速度小于受拉应力部分,同时弯曲断口的扫描电镜照片显示,与未加载情况相比弯曲加载试样受拉应力部分树脂与纤维粘结较弱,说明应力会对复合材料湿热性能产生影响,并且不同方向应力的作用规律不同。
The wet-heat characteristics of carbon fiber / double-horse composite unidirectional laminate under water immersion of 70 ℃ under three-point bending load were studied. The moisture absorption, glass transition temperature, bending property and failure mode of the laminate were tested. The effects of stress on the thermal and thermal behaviors of the composites were investigated by comparing the difference of the wet and hot plate properties under bending load and no load. The results show that there is no significant difference in the moisture absorption and the residual bending behavior of the specimen under bending load compared with the unloaded condition. However, the glass transition temperature decreases more when the same moisture absorption rate before the bending loading specimen. The results of scanning electron microscopy (SEM) images show that the compressive stress part of the specimen under the compressive stress is less than the tensile stress part, meanwhile the scanning electron micrograph of the bending fracture shows that the resin and the fiber are weakly bonded by the tensile stress part of the specimen under bending loading, The composite material has an influence on the wet and heat properties, and different directions of stress have different laws of action.