セラミックスの安定破壊が可能な三点曲げ試験装置の開発

概要

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A three-point bending machine for controlled crack extension in brittle ceramics is described. Based on analysis of Gibbs free energy, the machine is designed to be much stiffer than the specimen, thereby the stable crack extension can be achieved without additional devices, e.g. crack stabilizer. The specimens are loaded with a piezotranslator in a stiff steel frame. Applied load and displacement are measured with a quartz force transducer and a laser scanning micrometer, respectively. Conventional JIS R 1607 type three point bend SEN specimens are tested to confirm the ability of the machine. Experimentai results for Al_2O_3,Y-PSZ, SiC and Si_3N_4 specimens are presented. The stable crack extension is obtained successfully in each material, which demonstrates that the machine is a useful tool for R-curve determination and in-situ observation of an extending crack tip.
公益社団法人精密工学会の論文
1998-06-05