MONITORING FATIGUE CRACK GROWTH IN MULTI-LAYERED TENSILE SPECIMENS USING GUIDED ULTRASONIC WAVES.

Autor:	Kostson, E., Fromme, P.
Předmět:	ULTRASONIC waves ALUMINUM alloys LASER interferometers SIMULATION methods & models FINITE element method
Zdroj:	AIP Conference Proceedings; 2/22/2010, Vol. 1211 Issue 1, p1425-1432, 8p, 1 Black and White Photograph, 1 Diagram, 3 Graphs
Abstrakt:	This contribution presents a study for the monitoring of fatigue crack growth at fastener holes in multi-layered aircraft structures using low frequency guided ultrasonic waves. The investigated model multi-layered structure consists of two adhesively bonded aluminum alloy tensile specimens. Guided ultrasonic waves were excited using multiple piezoelectric discs bonded to the surface of the multi-layered structure. The wave propagation in the tensile specimen was measured using a laser interferometer and compared to numerical simulations. Experiments and 3D Finite Element (FE) simulations show a change in the scattered field around fastener holes caused by a defect in the 2nd layer. During fatigue crack growth, changes in the amplitude of the ultrasonic signal at a single point were monitored and correlated to the optically measured crack length. [ABSTRACT FROM AUTHOR]
Databáze:	Complementary Index
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