S042021 AE Detection of Microdamages and Long Term Reliability Assessment of ATZ Composite Ceramics for Artificial Joints

Abstract

The microdamages in ATZ composite ceramics during 4-point bending test were monitored by acoustic emission (AE) technique, and the rapid increase in cumulative AE energy prior to the final fracture was observed, which could be related with the maincrack formation as the origin of final fracture. The critical stress for maincrack formation σ_c was determined as the stress at rapid increasing point of AE signals. The stress increased with decreasing in Alumina weight fraction without 0% By increasing in ZrO_2, the growth grain size of Al_2O_3 was restrained and the flaw size turned smaller, since σ_c depends on the dispersion in the size and the distribution of initial failure.