The self-healing fiber-reinforced composite (abbreviation: shFRC) was made by adding SiC, a self-healing material, between an Al₂O₃ matrix and an Al₂O₃ continuous fiber. shFRC has the characteristic of healing the reduced strength by self-healing. The purpose of this study was to evaluate the damage and healing of new composite material, shFRC, and define new failure criteria. The test method used in this study was a high temperature creep test. The interface fracture behavior with time was investigated by analyzing the creep rate. The creep test conditions were 137 MPa and 150 MPa at 1,000 ^oC, and 68.5 MPa, 100 MPa, and 137 MPa at 1,200 ^oC, respectively. As a result, the crack propagation of 1,000 ^oC was stopped by healing, and the creep rate was zero. The crack healing part was higher than the strength before the crack formation. Due to the rapid hardening of the interface and the decrease in strength of the fiber, delayed fracture behavior was not observed at 1,200 ^oC. If the crack is stopped by self-healing at a constant load, shFRC can use that load stress as the allowable stress. However, when the reaction rate of the interface is markedly rapid, crack propagation is difficult to control.

Keywords: Damage and healing behavior, self-healing, Fiber reinforced ceramics, Crack branching, Creep test, Crack suppression