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研究了在机械/热模拟机上完成的三向编织碳/碳复合材料的高温拉伸力学性能实验及高温断裂特征。同时对断口形态进行了分析。实验结果表明:碳/碳复合材料在高温(1600～3000℃)拉伸曲线特征不同于它在较低温度及室温的特征。拉伸强度随温度的增高而增加,在2400℃时达到最大值,而后随温度增高而降低。断裂应变是随温度的增高而增加。断口分析发现碳/碳复合材料在高温下的断口组织要比低温光滑,且拉出纤维比低温少。
The high temperature tensile mechanical properties and high temperature fracture characteristics of three-direction braided carbon / carbon composites fabricated on a mechanical / thermal simulator were investigated. At the same time, the fracture morphology was analyzed. The experimental results show that the tensile characteristics of carbon / carbon composites at high temperature (1600 ~ 3000 ℃) are different from those at lower temperature and room temperature. Tensile strength increases with increasing temperature, reaches the maximum at 2400 ℃, and then decreases with increasing temperature. Fracture strain increases with increasing temperature. Fracture analysis revealed that the carbon / carbon composites were more stable at low temperature than those at low temperature, and the fiber was pulled out less than the low temperature.