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本文选用增韧 E-51 为基体分别与碳纤维、玻璃纤维和混杂纤维复合,测定了这两种复合材料的层间剪切强度、纵向冲击强度和层间断裂韧性。又通过扫描电镜观察断口形貌来研究增强材料与基体的界面粘结对复合材料力学性能的影响。研究结果表明增韧 E-51 基体在玻璃纤维表面形成一层厚度均匀的包复层。复合材料的破坏主要发生在包复层与基体之间,裂纹分枝多,G_c 值高,而碳/增韧 E-51中的碳纤维表面没有包复层,破坏发生在纤维与基体之间,裂纹分枝少,层间剪切强度与玻璃纤维复合材料相近而G_c值很低。 本文还对比了增韧E-51基体与F-46基体在界面粘接中的作用。研究结果表明,用玻璃纤维与F-46复合,界面粘结牢固,复合材料的层剪强度很高,G_c 值低。
In this paper, toughening E-51 as the matrix were combined with carbon fiber, glass fiber and hybrid fiber, the interlaminar shear strength, longitudinal impact strength and interlaminar fracture toughness of the two composites were measured. The morphology of the fracture surface was observed by scanning electron microscopy to study the effect of interfacial adhesion between the reinforcing material and the matrix on the mechanical properties of the composites. The results show that the toughened E-51 matrix forms a uniform thickness of cladding on the glass fiber surface. The failure of the composites occurred mainly between the cladding and the matrix, the cracks had many branches and the G_c value was high. However, the surface of carbon fiber in the carbon / toughening E-51 had no cladding and the damage occurred between the fibers and the matrix. Less cracked branches, similar interlaminar shear strength to glass fiber composites and low G_c value. The article also compared the role of toughened E-51 matrix and F-46 matrix in interfacial bonding. The results show that, with glass fiber and F-46 composite, the interface bonding firm, the shear strength of the composite material is high, G_c value is low.