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将中等模量的TORAYCA T-800碳纤维进行不同等级的表面处理,用于BASF 5245C改性双-马来酰亚胺树脂体系的层压复合材料,以改进其损伤容限。研究了树脂-纤维界面及其对复合材料强度和断裂形态的影响。使用扫描电子显微镜检测横向拉伸试样中平行于纤维方向的断裂面,发现经标准的表面处理后的表面形态,出现了纤维拔出和纤维表面缺少基体粘附的区域。在较高等级表面处理的情况下,断裂的引发主要出现在树脂基体中,而不是在纤维-树脂基体的界面上。就复合材料损伤容限性能来说,由于增加了表面处理,测得的冲击后的压缩强度提高了20％。列出了复合材料的横向弯曲、横向拉伸和EDS性能。研究了用这些纤维增强的复合材料的ModeⅠ和ModeⅡ的微观力学性能,以便来说明层间断裂韧性的特性。根据对ModeⅠ或ModeⅡ断裂面的观察,表面处理的方法影响甚微;表面断裂与所获得的ModeⅠ/Ⅱ值有小的差异。
The medium modulus TORAYCA T-800 carbon fibers were subjected to different grades of surface treatment for the laminated composites of BASF 5245C modified bis-maleimide resin system to improve their damage tolerance. The resin-fiber interface and its effect on the strength and fracture morphology of the composites were investigated. Scanning electron microscope (SEM) was used to detect the fracture surface parallel to the fiber direction in the transverse tensile test. It was found that the surface morphology after standard surface treatment showed the fiber pull-out and the lack of matrix adhesion on the fiber surface. In the case of higher-grade surface treatments, the initiation of rupture occurs predominantly in the resin matrix rather than at the fiber-resin matrix interface. In terms of the composite material’s damage tolerance properties, the measured compressive strength after impact was increased by 20% due to the increased surface treatment. The transverse bending, transverse drawing and EDS properties of the composites are listed. The micromechanical properties of Mode I and Mode II of composites reinforced with these fibers were investigated in order to illustrate the interlaminar fracture toughness properties. According to the observation of Mode I or Mode II fracture surface, the surface treatment method has little effect; the surface fracture has small difference with the ModeⅠ / Ⅱ value obtained.