Mechanism of stopping crack propagation in continuous fiber reinforced self-healing ceramic
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The self-healing fiber-reinforced composite (abbreviation: shFRC) was made by adding SiC, a self-healing material, betweenan 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 failurecriteria. The test method used in this study was a high temperature creep test. The interface fracture behavior with time wasinvestigated 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, andthe creep rate was zero. The crack healing part was higher than the strength before the crack formation. Due to the rapidhardening 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, whenthe reaction rate of the interface is markedly rapid, crack propagation is difficult to control.
Abstract
The self-healing fiber-reinforced composite (abbreviation: shFRC) was made by adding SiC, a self-healing material, betweenan 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 failurecriteria. The test method used in this study was a high temperature creep test. The interface fracture behavior with time wasinvestigated 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, andthe creep rate was zero. The crack healing part was higher than the strength before the crack formation. Due to the rapidhardening 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, whenthe reaction rate of the interface is markedly rapid, crack propagation is difficult to control.
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