TRANSPORT TECHNICS. INVESTIGATION OF ELEMENTS. RELIABILITY
Acoustic emission method of diagnostic of elevating rudder covering in places of lightning strikes impact
Acoustic emission (AE) is the process of emission of mechanical waves by materials caused by dynamic local restructuring of its internal structure under the influence of stresses of any kind. The source of AE is plastic deformation, the formation and growth of cracks, the outflow of a working fluid (liquid or gas) through holes. The AE method, unlike other methods of non-destructive testing (NDT), is passive, i.e. using the physical field of emission generated by the defects themselves. The acoustic emission (AE) method is based on the registration and analysis of acoustic waves arising in the process of plastic deformation and fracture (crack growth) of diagnostic objects. It makes possible to determine the places where the structure of the material changes when lightning strikes the covering of the elevating rudder for the composite laminate from which the elevating rudder of the RRJ aircraft is made.