Performance of interlayer toughened carbon fiber/epoxy composites of low areal density PA66 fiber veil
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摘要: 为改善碳纤维/环氧(CF/EP)复合材料的层间断裂韧性，通过湿法成网技术制备出四种不同面密度的聚酰胺66纤维网纱(PA66V)，随后将增韧网纱插入碳纤维单向布层间，借助真空辅助树脂灌注(VARI)工艺固化成型制备得到CF/EP复合材料。文中测试了增韧前后CF/EP复合材料的I型层间断裂韧性(GIC)和II型层间断裂韧性(GIIC)，结合断面SEM照片揭示了PA66V引入后CF/EP复合材料的增韧机制，并研究了网纱的引入对CF/EP复合材料其它力学性能的影响。结果表明，面密度为4 g/m2 PA66V的加入将CF/EP复合材料的GIC和GIIC分别提升了13.6%和139.8%，其增韧机制主要包括PA66纤维的桥接拔出、塑性变形以及引发裂纹偏转等；此时，CF/EP复合材料的层间剪切强度和拉伸强度也分别提高了6.5%和5.2%。Abstract: In order to improve the interlaminar fracture toughness of carbon fiber/epoxy (CF/EP) composites , four polyamide 66 fiber veils (PA66V) with different areal densities were prepared by wet-laid method, and then the toughened fiber veils was inserted into the carbon fiber unidirectional cloth layer, and the CF/EP composite material was prepared by curing and molding by vacuum assisted resin infusion (VARI) process. In this paper, the interlaminar fracture toughness of mode I (GIC) and mode II (GIIC) of CF/EP composites before and after toughening was tested, and the toughening mechanism of CF/EP composites after the introduction of PA66V was revealed by SEM photos of the cross-section, and the effect of the introduction of veils on other mechanical properties of CF/EP composites was studied. The results show that the addition of PA66V with an areal density of 4 g/m2 increases the GIC and GIIC of CF/EP composites by 13.6% and 139.8%, respectively, and its toughening mechanisms mainly include bridging and pulling, plastic deformation and crack deflection of PA66 fibers. At this time, the interlaminar shear strength and tensile strength of CF/EP composites are also increased by 6.5% and 5.2%, respectively.
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Key words:
- composite /
- interlaminar toughening /
- carbon fiber /
- polyamide 66 /
- fiber veil
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图 1 聚酰胺66纤维网纱(PA66V)制备流程示意图
Figure 1. Schematic diagram of the preparation process of polyamide 66 fiber veil (PA66V)
图 2 PA66V层间增韧碳纤维/环氧(CF/EP)复合材料制备流程示意图
Figure 2. Schematic diagram of the preparation process of PA66V interlayer toughened carbon fiber/epoxy (CF/EP) composites
图 3 不同面密度PA66V的表面形貌
Figure 3. Surface topography of PA66V with different areal densities
图 4 不同面密度PA66V层间增韧CF/EP复合材料的一型层间断裂韧性(GIC)测试结果：(a)样品的GIC值；(b)样品的R曲线
Figure 4. Mode I fracture toughness(GIC) test results of PA66V interlayer toughened CF/EP composites with different areal densities: (a) GIC of the sample;(b) R curve of the sample
图 5 不同面密度PA66V层间增韧CF/EP复合材料I型断面形貌图
Figure 5. Mode I fracture surfaces of PA66V interlayer toughened CF/EP composites with different areal densities
图 6 (a)参考样在I型测试过程中的碳纤维桥接;(b-c)I型断面SEM图像
Figure 6. (a) Carbon fiber of reference sample bridging during the mode-I test; (b-c) SEM images of mode I fracture surfaces
图 7 不同面密度PA66V层间增韧CF/EP 复合材料I型断面SEM图
Figure 7. SEM images of mode I fracture surfaces of PA66V interlayer toughened CF/EP composites with different areal densities
图 8 不同面密度PA66V层间增韧CF/EP复合材料的二型层间断裂韧性(GIIC)测试结果：(a)样品的载荷-位移曲线；(b)样品的GIIC值
Figure 8. Mode Ⅱ fracture toughness (GIIC) test results of PA66V interlayer toughened CF/EP composites with different areal densities: (a)Load-displacement diagram the sample; (b) GIIC of the sample
图 9 不同面密度PA66V层间增韧CF/EP复合材料的II型横截面图片
Figure 9. Mode II cross-sectional image of PA66V interlayer toughened CF/EP composites with different areal densities
图 10 不同面密度PA66V层间增韧CF/EP 复合材料II型断面SEM图
Figure 10. SEM images of mode II fracture surfaces of PA66V interlayer toughened CF/EP composites with different areal densities
图 11 不同面密度PA66V层间增韧CF/EP复合材料的层间剪切强度
Figure 11. ILSS of PA66V interlayer toughened CF/EP composites with different areal densities
图 12 不同面密度PA66V层间增韧CF/EP复合材料的拉伸性能
Figure 12. Tensile properties of PA66V interlayer toughened CF/EP composites with different areal densities
表 1 拉伸测试样品的纤维体积分数和平均厚度
Table 1. Fiber volume fraction and average thickness of the tensile test samples
Laminate for tensile The average thickness/mm Fiber volume fraction/% Ref 0.81 54.63 4 g/m2 0.90 49.47 6 g/m2 0.97 45.87 8 g/m2 1.02 43.46 10 g/m2 1.12 39.64 
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