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本文通过对于用中强碳纤维以高压工艺制得的三向增强碳-碳复合材料(简称三向碳-碳材料)进行拉伸性能测试和拉伸断口的扫描电镜观察,研究了三向碳-碳材料的拉伸断裂特性。三向碳-碳材料在拉伸应力作用下,其应力-应变曲线出现线弹性段和弹塑性段,显示“假塑性”特性。通过对三向碳-碳材料的微观结构和裂纹扩展的研究,提出了拉伸断裂的初步模式。在三向碳-碳材料中,纤维束是载荷的主要携带组元,纤维束中单丝的断裂是逐渐产生、发展和累积的结果,而不是突然发生的,因而认为三向碳-碳材料的拉伸断裂过程更接近于受累积断裂机理控制。
In this paper, by scanning electron microscopy (SEM) observation of tensile properties and tensile fracture of three-direction enhanced carbon-carbon composites made from medium-strength carbon fibers by high-pressure process (abbreviated as three-dimension carbon- Tensile fracture properties of carbon materials. Three-dimensional carbon-carbon materials under tensile stress, the stress-strain curve linear elastic section and elastic plastic section, showing the “pseudoplastic” characteristics. Based on the investigation of microstructure and crack propagation of three-way carbon-carbon materials, a preliminary mode of tensile fracture was proposed. In the three-way carbon-carbon materials, the fiber bundles are the main carrying components of the load. The rupture of monofilaments in the fiber bundles is the result of gradual generation, development and accumulation, rather than a sudden occurrence, so that the three-way carbon- The tensile fracture process is more closely controlled by the accumulated fracture mechanism.