COMPARISON OF SHEAR STRENGTH OF CERAMIC JOINTS DETERMINED BY VARIOUS TEST METHODS WITH SMALL SPECIMENS

Conference · Thu Jan 01 00:00:00 EST 2015

OSTI ID:1185434

Shih, Chunghao Phillip ^[1]; Katoh, Yutai ^[1]; Kiggans, Jr, James O ^[1]; Koyanagi, Takaaki ^[1]; Khalifa, Hesham ^[2]; Back, Christina A. ^[2]; Hinoki, Tatsuya ^[3]; Ferraris, Monica ^[4]

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1. ORNL
2. General Atomics, San Diego
3. Kyoto University, Japan
4. Politecnico di Torino

Four different shear test methods i.e. doubled notched shear test, asymmetrical four point bend test, Iosipescu test, and torsion test, were investigated for their ability to evaluate one standard SiC to SiC ceramic brittle joint while using small size specimens. Double notched shear test showed higher stress concentration at the notch base and a lower nominal shear strength. Both asymmetrical four point bend test and Iosipescu test utilized epoxy jointed metal extensors, which failed during test and caused misalignment and tensile type of failure. Torsion test can deliver true shear loading. However, base material failure was observed for the torsion joint samples in this study. None of the tests can successfully induce true shear failure of the joint because the joint is stronger and tougher than the SiC substrate. Torsion test appears to be promising because of the pure shear loading, less stress concentration, and easy alignment.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC05-00OR22725
• OSTI ID: 1185434
• Resource Relation: Conference: ICACC 2014, Daytona Beach, FL, USA, 20140126, 20140131
• Country of Publication: United States
• Language: English