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随着纤维增强复合材料的广泛应用,研究其在湿热环境下的动态力学性能具有重要的理论研究意义与工程应用价值。首先对碳纤维增强环氧树脂基(Carbon/Epoxy)复合材料层合板试件进行了湿热处理,其后采用分离式霍普金森压杆(SHPB)技术开展了干/湿态试件高应变率压缩实验并对实验结果进行分析。结果表明:材料脱(吸)湿过程呈现出两段式特点,存在二次脱(吸)水现象;Carbon/Epoxy复合材料层合板的强度在垂直铺层方向具有显著的应变率敏感性,随着应变率从1 500s-1增加至6 000s-1,其强度增加近3倍,与此同时应变率对其弹性模量的影响却非常微弱;此外,湿热处理有助于提升该材料的动态力学性能,经20d吸湿后材料动态强度有最大12.45%的增幅,吸湿使得材料动态强度的上升在应变率较低时比较明显。
With the wide application of fiber-reinforced composites, it is of great significance to study the dynamic mechanical properties of fiber-reinforced composites in theoretical research and engineering application. Firstly, wet-heat treatment was performed on carbon / epoxy composite laminates. High-strain-rate compression of dry / wet specimens was carried out by using split Hopkinson pressure bar (SHPB) Experiment and analyze the experimental results. The results show that the wet-out process of material exhibits a two-stage characteristic with the phenomenon of secondary desorption water. The strength of Carbon / Epoxy composite laminates has significant strain rate sensitivity in the direction of vertical layup. The strain rate increases from 1 500s-1 to 6 000s-1 and its strength increases nearly 3-fold. At the same time, the effect of strain rate on the elastic modulus is very weak. In addition, wet heat treatment helps to improve the material’s dynamic Mechanical properties, the dynamic strength of the material after 12d moisture absorption has the largest increase of 12.45%, moisture absorption makes the material dynamic strength rise is obvious when the strain rate is low.