WAVEFORM ANALYSIS OF ACOUSTIC SIGNALS FROM A MILD STEEL.
Abstract
Tensile specimens of AISI 1015 steel, with and without a sharp flaw, were pulled in tension to fracture while the acoustic signals emitted were detected using a wideband transducer and recorded for later analysis. It was found that the acoustic signals emitted from flawed specimens had a slightly higher amplitude, longer time duration and lower frequency content than those from unflawed specimens. The results show that various characteristics of the acoustic emission signal can be correlated to the state of strain and nature of the emission source.