High Strain Rate Characterization of Ceramics in Shear
OHIO STATE UNIV COLUMBUS
Pagination or Media Count:
Ceramic materials are being used in applications that involve high rates of loading. Examples are jet engines and protective armor components. Most of the available data with regard to dynamic response of ceramics have been obtained from experiments that involve compressive loading. Two techniques, the normal plate impact and the compression split Hopkinson bar, are most commonly used for testing under high rate loading in compression. Results from normal plate impact tests generally show a increase in the yield strength when the Hogionot Elastic Limit HEL is transformed to uniaxial stress and compared with the static uniaxial yield stress. Tests on commercial aluminum oxides show a dynamic yield strength of 43 Kbars compared to a quasi-static yield strength of 19.3 Kbars. High strain rate tests with the compression split Hopkinson bar have been conducted. Results on aluminum oxides at various temperatures show an increase in the compressive strength with increasing strain rate.
- Ceramics, Refractories and Glass