| Numéro |
J. Phys. Colloques
Volume 46, Numéro C4, Avril 1985
International Conference on the Structure and Properties of Internal Interfaces
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|---|---|---|
| Page(s) | C4-613 - C4-626 | |
| DOI | https://doi.org/10.1051/jphyscol:1985466 | |
International Conference on the Structure and Properties of Internal Interfaces
J. Phys. Colloques 46 (1985) C4-613-C4-626
DOI: 10.1051/jphyscol:1985466
1 Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720, U.S.A.
2 Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaften, D-7000 Stuttgart 1, F.R.G.
J. Phys. Colloques 46 (1985) C4-613-C4-626
DOI: 10.1051/jphyscol:1985466
ON THE MECHANICS OF FAILURE IN CERAMIC/METAL BONDED SYSTEMS
A.G. Evans1, M. Rühle2 et M. Turwitt21 Department of Materials Science and Mineral Engineering, University of California, Berkeley, CA 94720, U.S.A.
2 Max-Planck-Institut für Metallforschung, Institut für Werkstoffwissenschaften, D-7000 Stuttgart 1, F.R.G.
Abstract
Stress concentrations that develop in metal/ceramic bonded systems have been evaluated and shown to encourage crack propagation at, or near, the edge of bonded interfaces. Experimental indentation observations on Nb/Al2O3 confirm the existence of the predicted stress concentrations. In this system, failure was invariably observed to initiate in the ceramic, such that quasi-static cracks located at the interface exhibited crack blunting. However, substantial dynamic reductions in the crack growth resistance of the interface are inferred from fracture surface observations. Implications for the optimal strengths of ceramic/metal bonded systems are presented.