What is the peak stress in ceramic bar impacts?

Simha, C. Hari Manoj; Bless, S. J.; Bedford, A.
April 2000
AIP Conference Proceedings;2000, Vol. 505 Issue 1, p615
Academic Journal
The bar impact experiment has been extensively used to characterize the high strain rate properties of high strength ceramics. In particular, alumina AD-99.5 has been widely studied; both stress gauge and VISAR bar impact data are available for this material. We have performed plate-on-bar impact experiments using this material in some novel configurations. An interface was introduced in the target bar (by cutting it) in the zone where the material fails by axial splitting. Such experiments resulted in a dramatic drop in the peak stress measured in the experiment, when compared to experiments with no interface. We show that the damage kinetics in tension influence these measurements. Since the peak stress is dependent on the damage kinetics we conclude that the measurement cannot be correlated to some intrinsic strength of the ceramic.


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