【摘要】 多向编织碳纤维树脂基复合材料是航空、航天领域中的新型重要结构材料。为了研究这类材料的失效机理，在扫描电镜下进行了断口分析。研究了碳纤维与树脂及其界面在受力形变过程中裂纹形成与扩展的特性，探索了这类复合材料的损伤机理。结果表明： 编织参数对试件的力学性能有重要影响。随编织角减小，弹性模量和抗拉强度都明显增大，纤维与树脂间界面的粘结强度提高，脆性增大。在断裂过程中碳纤维多呈脆性断裂特征，断裂起源于纤维表面的薄弱处。更多还原

【Abstract】 Multi dimensional braided carbon fiber/epoxy resin composites are significant structural materials in the fields of astronautics and aeronautics. The fracture morphology was investigated by a scanning electron microscope (SEM), the damage mechanism of the multi dimensional braided carbon fiber/epoxy resin composites was analyzed. The results demonstrate that the mechanical properties can be significantly affected by the parameters of braiding. With the decreasing of braiding angles the elastic modulo E and ultimate tensile strength σ b increase obviously. Binding strength between fiber and epoxy is increased, The fracture morphology has the character of brittle fracture in carbon fiber and the cracks are always germinated at the defective places of the surface of carbon fiber.更多还原