Since its inception as a technique of nondestructive evaluation, acoustic emission has held great promise for its ability to provide monitoring of structures on a continuing basis. Equipment development, however, has emphasized periodic testing and a lack of adaptation to the specific conditions of a given structure, such as aircraft, in terms of operating conditions, noise, vibration ... etc. Because of these factors, the use of acoustic emission for continuous monitoring of aircraft structures has been lacking. Recently, the author of the present paper has approached the problem from two angles. Firstly, he has developed a predictive approach for using acoustic emission to monitor fracture and fatigue of materials. In this approach, the relationship between acoustic emission and fatigue life (expressed as stress intensity factor or the number of cycles to failure) is defined both theoretically and experimentally. It is then possible, using techniques of dynamic pattern recognition, to obtain the status of a structure with respect to its remaining life. Acoustic emission maps for different materials failing by fatigue are produced. Secondly, he has patented a new acoustic emission system which relies on using intelligence and expert system software, as well as 'rules' for defining fatigue damage. The combination of these two approaches produces a significant development in using acoustic emission for continuous monitoring of aircraft and other structures and fulfills the promise held by AE in that direction.
Use of acoustic emission for continuous surveillance of aircraft structures
Die Anwendung der Schallemission für die kontinuierliche Überwachung von Flugzeugstrukturen
1990
6 Seiten, 7 Bilder, 9 Quellen
Aufsatz (Konferenz)
Englisch
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