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采用光学显微镜和 JEM- 6 30 1F场发射扫描电镜 ,观察了多向编织碳纤维 /环氧树脂复合材料在不同载荷下的断口和微损伤形貌 ,并分析其破坏形式和损伤过程。目的是为复合材料的结构设计和制造提供依据。实验结果表明 :低速加载下断裂过程依赖于应力的传递特性 ,表现为脆断 ,纤维断裂主要是由纤维表面缺陷引起的。在爆炸冲击下 ,试件碎裂区纤维呈现出剪切断裂和脱粘拔出 ,纤维间树脂呈层状或河流状花样 ;爆炸产生的复杂应力将首先择优作用于编织束界面上 ,形成沿束界面扩展的裂纹
Optical microscopy and JEM-6 30 1F field emission scanning electron microscopy were used to observe the fracture and micro-damage morphologies of multidirectional braided carbon fiber / epoxy composites under different loads. The damage forms and damage processes were also analyzed. The purpose is to provide the basis for the structural design and manufacture of composite materials. The experimental results show that the fracture process depends on the stress transfer characteristics under low-speed loading, showing brittle fracture. The fiber fracture is mainly caused by the fiber surface defects. Under the impact of explosion, the fibers in the fracture zone of the specimen show shear fracture and debonding, and the resin between the fibers presents a layered or river-like pattern. The complicated stress generated by the explosion will firstly preferentially act on the braided beam interface to form a Beam interface to extend the crack