A Direct Measuring Method of Bridging Stresses for Polycrystalline Ceramics

Abstract

A direct measuring method of bridging stresses for polycrystalline ceramics has been developed. Bridging stresses are measured by the stable fracture of the double-edge-notched specimen using the bridging stabilizer developed in this study. The opening displacement of the fracture surfaces is evaluated from the deformation of the bridging stabilizer and the double-edge-notched specimen without the need for microscopic measurement. As an example of the application, the bridging stresses of polycrystalline alumina are measured under monotonic load. The bridging characteristics measured using the present method are compared with those obtained by the other methods. An approximate expression of the bridging stresses obtained in this study is presented.