碳纤维强度的统计特性及对复合材料线芯力学性能的影响

测试了国产T300级碳纤维的单丝和复丝拉伸强度,并用Weibull分布来描述碳纤维单丝平均拉伸强度。采用拉挤工艺制备出国产碳纤维复合线芯,测试了国产碳纤维复合线芯的弯曲强度和短梁剪切强度性能。结果表明:国产T300级碳纤维单丝拉伸强度性能达到东丽T300碳纤维水平,且分散性更小;复丝强度略低。国产T300级碳纤维集束性较差,在拉挤抽纱过程中,容易夹纱和起毛。在纤维体积含量基本相同情况下,国产T300级碳纤维复合线芯力学性能与东丽T700碳纤维复合线芯力学性能相差不大。

Study of statistical characteristics of carbon fiber and effects on mechanical properties of carbon fiber composite cores

Single fiber and fiber bundle tensile strengths of Chinese-made carbon fiber were tested and its average single fiber tensile strength was described by Weibull statistical method. Carbon fiber reinforced composite core was made by pultrusion process with the Chinese-made carbon fiber. The bending and shearing properties of the composite core were studied. Results show that, compared with the Toray T300 carbon fiber from Japan, Chinese-made carbon fiber has almost the same average single fiber tensile strength, lower discrete property and a little lower average fiber bundle tensile strength. The aggregation property of the Chinese-made carbon fiber is not good enough. Carbon fiber yarns were nipped and fluffed when being drawn out. No significant difference can be found for the mechanical properties of the composite cores made with the Chinese-made carbon fiber and the Toray T700 carbon fiber from Japan.