玻纤和碳纤在低温下的强度统计特性

Statistical Characteristics of Strength at Low Temperature for Glass and Carbon Fibers

利用纤维强伸实验仪和自制的低温实验装置,研究了碳纤维与玻璃纤维在低温(77K)下的拉伸力学性能.由测试数据发现,低温下纤维的强度分布具有统计性,采用Weibull统计分布可以较好的进行描述.在低温下,两种纤维的强度Weibull分布尺度参数和平均强度都有不同程度的提高,而形状参数和弹性模量则基本保持不变.

A series of single fiber tensile tests were conducted at 77K and room temperature for glass and carbon fibers. The results show that at low temperature the statistical characteristics of the tensile strength can still be described by Weibull distribution function and the average strengths are increased with different degree to the case of room temperature for both types of the fibers. The scale parameter exhibits remarkable rising at 77K for glass fiber, while it is slight for carbon fiber. However, the shape parameters and tensile modulus have no obvious change to the case of room temperature for both types of the fibers.