Abstract
Acoustic emission (AE) testing is one of the major nondestructive testing (NDT) techniques, and it can be used as the real-time monitoring method for the purpose of detecting fatigue damages. However, AE testing data for steels during the low-cycle fatigue test is rarely reported. In this study, AE monitoring was conducted during low-cycle fatigue test for austenitic stainless steel with the aim of detecting fatigue damages and identifying the source of AE. Those AE occurred in the process of increscent phase which is loading under tensile and unloading under compression and the contact of the crack surfaces were observed at the increscent phase. This means that friction of the crack surfaces induced AE. Therefore, the potential for monitoring low-cycle fatigue crack was demonstrated by focusing on the friction-induced AE (secondary AE).
