On the Interpretation of the Acoustic Emission Signals

Abstract

The A.E. signals are of nonstationary random type, the nonstationarity being connected with the evolution of the source, whose characterization is here pursued by the development of methodologies of statistical analysis of non stationary signals. The A.E. signal is hypothesized to be constituted by a combination of a stationary random component and a deterministic one, whose behavior represents the evolution of the source. The determination of this latter component is carried out for signals from tensile tests on C.T. specimens. A second approach to the signal interpretation problem is also presented. It is based on the representation of the A.E. signal as random pulses of varying duration and amplitude.