| Issue |
J. Phys. IV France
Volume 04, Number C8, Septembre 1994
EURODYMAT 1994 - 4th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
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| Page(s) | C8-689 - C8-694 | |
| DOI | https://doi.org/10.1051/jp4:19948105 | |
EURODYMAT 1994 - 4th International Conference on Mechanical and Physical Behaviour of Materials under Dynamic Loading
J. Phys. IV France 04 (1994) C8-689-C8-694
DOI: 10.1051/jp4:19948105
Dept. of Aeronautical Engineering, Kyoto University, Sakyo-ku, Kyoto 606, Japan
© EDP Sciences 1994
J. Phys. IV France 04 (1994) C8-689-C8-694
DOI: 10.1051/jp4:19948105
Crack stability in rate sensitive ceramics and their rate dependence
T. NojimaDept. of Aeronautical Engineering, Kyoto University, Sakyo-ku, Kyoto 606, Japan
Abstract
The crack stability condition in rate sensitive brittle materials is analysed. The analysis shows that a crack begins to extend before a maximum load (Pmax) appears in fracture toughness (KI) tests and the extension depends on the n-value in the aαKnI relation. This suggests that the evaluation of a true KI-value is quite difficult. An analytical method for using the KIi-value (the initial stress intensity evaluated by the Pmax and initial crack length) is proposed. Experimental data for an alumina ceramic and a glass are analysed by the method. The KIi-Tf relation of the glass consists of 4 regions over the range 10-5s <Tf<107s where Tf is the time to failure.
© EDP Sciences 1994