Evaluation of the Crack Face Bridging Mechanism in a MgAl2O4 Spinel |
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| Authors: | Kenneth W. White Girish P. Kelkar |
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| Affiliation: | Department of Mechanical Engineering, University of Houston, Houston, Texas 77204–4792 |
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| Abstract: | The effectiveness of a grain bridging mechanism in the following wake zone of two MgAl2O4 spinel microstructures has been demonstrated through renotching experiments with double-cantilevered-beam (DCB) specimens. Measurements of d KR /dδ a agree with previous crack growth resistance curves of similar materials, obtained from single-edgenotch-beam specimens. However, even the extended test ligaments available from the present DCB specimens did not permit the full development of the following wake zone of these coarse microstructures. |
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| Keywords: | fracture toughening mechanism monoliths crack growth resistance |
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