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  • Correlation between fracture mechanics and acoustic emission detected during bending tests on ceramic materials by means of statistical methods

Abstract

The aim of this work is to observe whether and in what sense a correlation can be found between acoustic emission data and mechanical behaviour during bending tests of ceramic materials, moreover introducing some considerations on the level of brittleness showed at the moment of collapse. Such an assessment concerns especially the possibility of recognizing tenacization induced by adding Y(2)O(3) to ZrO(2) so to obtain a partially stabilized zirconia (PSZ). With this goal, a deeper analysis of acoustic emisison (AE) signals has to be carried out, inserting in this evaluation a compartive study between duration of acoustical activity during material failure and cumulative counts/cumulative energy ratio, related probably with real tenacization possibilities. This can resolve the discrepancies that divert data from a generally verified dependence between stress released energy and modulus of ruptive (MOR) values. So to resume the sense of the work, it can be concluded that AE observations are able to solve some residual doubts coming from scanning electron microscope (SEM) fractographies, measuring with a greater precision the criticality of an original defect, induced, for example, by machining.

Additional information

Authors: BILLI F, Università di Roma, La Sapienza (IT);SANTULLI, JRC Ispra (IT)
Bibliographic Reference: Paper presented: Saint Etienne (FR), November 15-16, 1995
Availability: Available from (1) as Paper EN 39471 ORA
Record Number: 199610102 / Last updated on: 1996-02-16
Category: PUBLICATION
Original language: en
Available languages: en