SYMPOSIA PAPER Published: 01 January 1992

Fracture Toughness Evaluation of Ceramic Bonds Using a Chevron-Notch Disk Specimen


The chevron-notched diametrally compressed disk specimen has been used to measure the fracture toughness of zirconia/zirconia bonds and zirconia/nodular-cast-iron bonds. The data are reasonably consistent with experience obtained using monolithic ceramics. In particular, the strain energy release rate increases with increasing shear:tension ratio, and the opening-mode fracture toughness measured using the disks is generally within 20% of the value obtained with bend beams. However, the shear toughnesses of the bonds investigated are approximately 2.4 times the opening toughness, a ratio somewhat higher than that for monolithic ceramics. The high ratio can be attributed to rubbing of mutually opposed crack faces, deviation of the fracture plane into higher-toughness zirconia prior to instability for the ceramic/ceramic bonds, and shear of the braze-metal interlayer in the case of the metal/ceramic bonds.

Author Information

Rosenfield, AR
Battelle Memorial Institute, Columbus, OH
Majumdar, BS
Battelle Memorial Institute, Columbus, OH
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Developed by Committee: E08
Pages: 63–73
DOI: 10.1520/STP24711S
ISBN-EB: 978-0-8031-5219-9
ISBN-13: 978-0-8031-1480-7