Indentation Fracture Response and Damage Resistance of Al2O3-ZrO2 Composites Strengthened by Transformation-Induced Residual Stresses |
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Authors: | James J Hansen Raymond A Cutler Dinesh K Shetty Anil V Virkar |
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Affiliation: | Ceramatec, Inc., Salt Lake City, Utah 84119;Department of Materials Science and Engineering, University of Utah, Salt Lake City, Utah 84112 |
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Abstract: | Indentation fracture behavior of three-layer Al2O3-ZrO2 composites with substantial compressive residual stresses was compared with the behaviors of monolithic Al2O3 and Al2O3-ZrO2 ceramics without intentionally introduced residual stresses. The indentation cracks were smaller in the three-layer specimens relative to the monolithic specimens in agreement with the predictions of indentation fracture mechanics theory. Indentation and strength testing were used to show that a residual compressive stress of approximately 500 MPa exists in the outer layers of the three-layer composites. The three-layer specimens showed excellent damage resistance in that the strength differential between the three-layer and monolithic indented specimens was maintained at indentation loads up to 1000 N, the maximum indentation load used in the experiments. |
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