Understanding Acoustic Emission Testing- Reading 1 Part B-A

3. Have high amplitude acoustic emissions events occurred? If no, individual
fracture events have been relatively minor; if yes, major fracture events
have occurred.
4. Does acoustic emission occur if the structure has been unloaded and is
then reloaded to the previous maximum load? If no, there is no damage or
crack propagation under low cycle fatigue; if yes, internal damage exists
and the damage sites continue to spread even under low loads.
5. Does the acoustic emission occur only from a particular area? If no, the
entire structure is being damaged; if yes, the damage is localized.
6. Is the acoustic emission in a local area very localized? if no, damage is
dispersed over a significant area; if yes, there is a highly localized stress
concentration causing the damage.
Charlie Chong/ Fion Zhang