三维四向编织碳纤维/环氧树脂复合材料在热环境中的拉压力学性能实验

Experimental investigation on the tensile and compressive properties of 3D 4-directional braided carbon fiber/epoxy resin composites in thermal environment

针对不同编织角度的三维四向编织碳纤维/环氧树脂复合材料,进行了热环境下的轴向拉伸和压缩力学性能实验研究,讨论了温度对三维四向编织复合材料的轴向拉伸和压缩力学性能的影响,并根据宏观断裂形貌和SEM图像分析了材料的破坏和断裂机制。结果表明,随着测试温度的升高,三维四向编织碳纤维/环氧树脂复合材料的纵向拉伸强度有小幅提高,而纵向压缩强度显著降低。在室温条件下,编织角对材料的纵向拉伸破坏特征没有影响,而对材料的纵向压缩破坏特征有较大影响。随着测试温度的升高,不同编织角度复合材料的纵向拉伸和压缩的损伤破坏形态均与室温条件下明显不同。

The longitudinal tensile and compressive experiments on 3 D 4-directional braided carbon fiber/epoxy resin composites with three different braiding angles were performed in thermal environments. The effects of temperature on the longitudinal tensile and compressive properties of 3 D braided composites were discussed. Macro fracture morphology and SEM micrographs were examined to understand the damage and failure mechanism. The results show that the longitudinal tensile strength of 3 D 4-directional braided carbon fiber/epoxy resin composites goes up slightly and the longitudinal compressive strength decreases obviously with the increase of testing temperature. The braiding angle has no apparent impact on the longitudinal tensile failure characteristics of composites. However, the effect of braiding angle on the longitudinal compressive failure characteristics of composites is obvious. As the temperature increases, the damage and failure patterns of 3 D braided composites with three different braiding angles are obviously different than in room.