Abstract
This paper describes creep rupture model considering interfacial debonding and relaxation on interfacial shear stress in broken fibers in unidirectional phenol matrix composites reinforced with glass fibers. Interfacial debonding is accompanied with fiber breaks under the tensile load. It depends on the strain of the composites and is represented as a function of the strain by considering the energy balance equation of interface. Interfacial debonding length, fiber failure probability and interfacial shear stress are measured experimentally on fragmentation test and then formulated as a function of the strain. Interfacial debonding length is taken in Curtin's model that is considering break of fiber and creep rupture time is predicted. Relaxation on interfacial shear stress is also taken in creep rupture model in a long time.
