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Published September 1994 | metadata_only
Journal Article

Evaluation of Ceramic Specimen Geometries Used in a Split Hopkinson Pressure Bar


Various ceramic specimen geometry and insert configurations being used for dynamic compression testing in a split Hopkinson pressure bar are analyzed numerically using DYNA2D. The objective of the analysis is to study the magnitude and locations of stress concentrations in the specimen, the degree to which the hard ceramic indents into the bar, the stress distribution with the specimen, and the effect of specimen size relative to the bar diameter. It is found that a "dog-bone" shaped specimen with end diameter matching the bar diameter is an ideal geometry which yields a uniform stress distribution with the gage length of the specimen. A cylindrical specimen with impedance matched tungsten carbide inserts is also found to be a sound combination for obtaining reliable experimental data on the failure strength of ceramics. A cylindrical specimen with diameter matched conical alumina inserts performs equally well but has the disadvantage of additional machining costs in making the conical ceramic inserts.

Additional Information

© 1994 European Dymat Association. Received 29 March 1994, accepted 8 September 1994. The support provided by a Presidential Young Investigator Award to G.R. from the National Science Foundation grant No. MSS-9157846 and the matching funds provided by the Dow Chemical Company are gratefully acknowledged. The support of the Army Research Office through contract No. DAAL03-02-6-0192 is also gratefully acknowledged. The computations were performed on a Cray Y-MP at the San Diego Supercomputer Center (SDSC).

Additional details

August 20, 2023
August 20, 2023