Interpretation of the signal of acoustic emission in the thin plate as the consequence of the properties of Lamb's waves

Abstract

The purpose of the present report consists in studying an opportunity of use of devices for registration of complex signals in thin-walled details of structures. Lamb’s wave properties were used for explanation of dynamic reaction of thin plate surface when in some place there is some source of impulse loading. The experiment on the study of some parameters of propagation of elastic waves in the plate from the Al-Cu aluminum alloy was carried out. Using the Lamb’s waves’ dispersion property, the formal simulation of waves interference was carried out. It was shown that dynamic reaction of thin plate surface can be explained as effect of several waves’ interference. More detailed researching of the structure and the parameters of signals, excited with the impact loading, composes the basis of this work.