A study on compressive strength of carbon fiber considering nano-scale surface defect

在扫描电子显微镜下对单根碳纤维进行纵向直接压缩测试，并对碳纤维的纵向抗压强度进行了测量。试验使用了两种类型的碳纤维，即中等强度和高抗拉强度碳纤维。中等抗拉强度碳纤维的抗压强度和抗拉强度基本相同。而高强碳纤维的抗压强度远低于抗拉强度。高抗拉强度碳纤维的抗压强度低可能是高抗拉强度碳纤维制成的碳纤维增强塑料抗压强度低的主要原因。

Longitudinal direct compression testing of a single carbon fiber was performed in a scanning electron microscope, and the longitudinal compressive strength of a carbon fiber was measured. Two types of carbon fiber, i.e. intermediate and high tensile strength carbon fibers, were used for the test. The compressive and tensile strengths of the intermediate tensile strength carbon fiber were almost the same. In contrast, the compressive strength of the high strength carbon fiber was much lower than the tensile strength. The low compressive strength of high tensile strength carbon fiber could be the main cause of low compressive strength of a carbon fiber reinforced plastic made of a high tensile strength carbon fiber.