Page Effects of Interfacial Strength on Tensile Fracture Mechanism of C/C Composites

摘要

Tensile fracture mechanisms of C/C (carbon fiber reinforced carbon matrix) composites have been thought to be inseparably connected with the interfacial properties between fiber and matrix. However, the interface effects on tensile strength have not been quantitatively understood. In the present study, interfacial debonding and sliding stresses by fiber bundle push-out tests were determined along with tensile fracture strain for various 2D and 3D composites. All the tested C/Cs exhibited higher fracture strain when interface was weaker. This tendency clearly indicates that tensile fracture strain is controlled by the penetration probability of matrix cracks into the reinforcing fiber.