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碳纤维属于脆性材料。抗拉强度随着测试样品长度的增加而降低,这是缺陷控制强度的主要实验依据,对于同样长度的测试样品,强度值的分散性非常大,这表明缺陷在碳纤维表面和内部是随机分布。碳纤维经气相氧化后,抗拉强度可得到提高,这归因于表面裂纹的消除,或因氧化刻蚀而使裂纹尖端钝化。碳纤维强度的统计性质可用Weibull统计理论来分析。Weibull模数m可作为裂纹频率分布因子。
Carbon fiber is a brittle material. Tensile strength decreases as the length of the test sample increases, which is the main experimental basis for the strength of the defect control. For the same length of the test sample, the dispersion of the strength value is very large, indicating that the defects are randomly distributed on the surface and interior of the carbon fiber. Tensile strength of carbon fibers after gas phase oxidation can be increased due to the elimination of surface cracks or the passivation of the crack tip due to oxidative etching. The statistical properties of carbon fiber strength can be analyzed using Weibull statistical theory. Weibull modulus m can be used as the crack frequency distribution factor.