Acoustic emissions are stress waves generated within a material by the release of stored strain energy during deformation, degradation and flaw growth. These stress waves propagate through the structure until they reach the surface where they may be detected by piezoelectric transducer responding at ultrasonic frequencies. The use of more than one transducer allows a triangulation to be performed to locate the acoustic emission source on the structure. Earthquake monitoring on a microscopic scale is a good analogy for acoustic emission. AE is both real-time and 100 % volumetric and is particularly suited to the monitoring of fatigue and proof testing of vehicle components and structures in metals, composites and plastics. In this paper we shall discuss some of the applications in which Gaydon Technology has successfully employed AE techniques. These include the detection of crack initiation and growth in components on fatigue test rigs, the location of fatigue cracks in vehicle structures on durability rig test, and the proof testing of welded components for quality assurance.
Progress in acoustic emission for component development
Fortschritte bei der Anwendung der Geraeuschemission zur konstruktiven Verbesserung von Bauteilen
16th ISATA, 16th Int. Symp. on Automotive Technol. and Automation ; 2 , May ; 381-404
1987
24 Seiten, 18 Bilder, 6 Quellen
Conference paper
English
Progress in acoustic emission for component development
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