Acoustic emission and damage characteristics of alumina

Advanced multi-channels acoustic emission (AE) system is used to study the fracture process of alumina material subjected by three-point-bending loading. Using AE counts and AE hits, the location of damage and damage characteristics are discussed. AE energy, AE counts, AE amplitude changing with loading time are analyzed for the notched alumina specimen. It is indicated that AE characteristic parameters reflect the damage process and fracture of material.

► AE counts and AE events reflect the damage degree of alumina sample.
► AE characteristic parameters changing with time can describe dynamic fracture of material.
► We propose a simple method for location of crack source.
► Location of crack source is calculated using acoustic emission energy.