碳纤维三轴机织物/环氧树脂基复合材料的弯折性能

Folding properties of carbon fiber triaxial woven fabric/epoxy resin composites

  • 摘要: 以碳纤维为增强材料,平面三轴机织物为增强体结构,环氧树脂为基体,通过真空辅助树脂传递模塑技术(Vacuum assisted resin transfer molding ,VARTM)制备了碳纤维三轴机织物增强环氧树脂基(Triaxial woven fabric/epoxy resin,TWF/EP)复合材料。借鉴金属材料薄板弯折性能试验方法,采用万能试验机开展TWF/EP的弯折实验,探究其弯折性能和损伤机制。研究结果表明:TWF/EP复合材料的弯折强度和模量与纤维束规格呈显著正相关性,与角度呈负相关性。在0°~30°范围内,TWF/EP复合材料的弯折性能变化幅度较小,表现出准各向同性。TWF/EP复合材料的力学响应表现为脆断,破坏模式分完全折断和不完全折断,TWF/EP复合材料的弯折断裂机制主要为纯剪切破坏、压剪耦合破坏及拉剪耦合破坏。

     

    Abstract: Carbon fiber triaxial woven fabric/epoxy resin (TWF/EP) composite was prepared by vacuum assisted resin transfer molding (VARTM) method, in which carbon fiber TWF was reinforced material, and epoxy resin was matrix. Referring to the metallic materials-sheet and strip-test method for bending and folding properties, the bending experiment of TWF/EP was carried out to explore its bending performance, and the damage morphology and damage mechanism were analyzed. The results show that the folding strength and modulus of TWF/EP composites have a significant positive correlation with the fiber bundle specification and a negative correlation with the angle. In the range of 0°-30°, the folding properties of TWF/EP composites change slightly and show quasi-isotropy. The mechanical response of TWF/EP composites is brittle fracture, and the failure mode can be divided into complete fracture and incomplete fracture. The folding fracture mechanisms are mainly pure shear failure, compression-shear coupling failure and tenso-shear coupling failure.

     

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