Irregular section carbon fiber and its effects on mechanical properties of composite

A kind of irregular section carbon fiber and its epoxy composite were involved. The surface performance and fabric of carbon fiber were tested, and mechanical properties, damaged pattern and fiber arrange way of composite were analyzed. The irregular section fiber and its composite were compared with T300 and T300/epoxy composite. It was shown that the cross-section shape of irregular fiber was kidney-shaped, the surface of irregular fiber was smooth, the surface chemical activity of irregular fiber was weak and the degree graphitization of irregular fiber was low. But it was revealed that the irregular fiber had a larger specific surface area and greater wetting ability with liquid than T300. By the mechanical property measure, the performance of irregular fiber/epoxy composite approached to T300/epoxy composite. It was indicated by SEM that the interfacial adhesion of irregular carbon fiber/epoxy composite was poor and the distribution of irregular fiber in composite was uneven.