Folding properties of carbon fiber triaxial woven fabric/epoxy resin composites
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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。
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关键词:
- 碳纤维三轴机织复合材料 /
- 弯折性能 /
- 损伤力学模式 /
- 各向同性 /
- 力学响应
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. -
图 3 碳纤维TWF/EP复合材料在宏观尺度上的弯折过程及其损伤形貌:((a1)~(a7)) TWF/EP复合材料的弯折响应过程;(a8) 不同角度试样的弯折断口走向;(b) 断口的细观形貌;((c1)~(c2)) 断口的微观形貌
Figure 3. Folding process of carbon fiber TWF/EP composites on macro scale: ((a1)-(a7)) Folding response process TWF/EP composites; (a8) Trend of folding fracture of samples with different angles; (b) Micro morphology of fracture; ((c1)-(c2)) Micro morphologies of fracture
Y—Displacement
表 1 三轴机织复合材料结构参数
Table 1. Structural parameters of triaxial woven fabric composites
No. Carbon fiber Yarn width/mm Yarn center distance/mm Porosity/% Thickness/mm Area density/(g·m−2) Fiber volume/vol% 3-1 T300-3 k 1.4 4.5 34 0.389 250.0 33.3 3-2 5.5 41 0.345 212.2 27.9 6-1 T300-6 k 2.1 5.5 34 0.458 383.3 35.7 6-2 6 37 0.403 330.3 32.4 -
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