Si_3N_4系セラミックスの衝撃圧縮下の降伏特性(<小特集>衝撃小特集)

概要

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In oder to study the yielding property etc. under shock compression of the Si_3N4 ceramics, the Hugoniot curve measuring experiments were performed in the pressure range up to 35 GPa. Two different kind of sintered specimen (the normal and fine sintered ones) were used to examine the effect of fine structure on the yielding property. The Hugoniot parameters were measured by the inclined-mirror method combined with the keyed-powder gun. The Hugoniot-Elastic limit (HEL) stresses of the normal and fine sintered ones were determined to be 10.2〜15.5 and 15.0〜22.0 GPa, respectively, and both Hugoniot compression curves converge each other in the plastic region.As a result, it was found that, although these Si_2N_4 ceramics behave as elastoplastic solids under shock compression,hugoniot-elastic limits are strongly influenced by its fine structure.
社団法人日本材料学会の論文
1990-12-15