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Shearographic visualization of lamb waves in carbon epoxy plates interaction with delaminations*

Published online by Cambridge University Press:  15 January 2000

F. Taillade ,
J.-C. Krapez ,
F. Lepoutre  and
D. Balageas
F. Taillade*
Affiliation:
ONERA, Department of Solid Mechanics and Damage, B.P. 72, 29 avenue du Général Leclerc, 92332 Châtillon Cedex, France
J.-C. Krapez
Affiliation:
ONERA, Department of Solid Mechanics and Damage, B.P. 72, 29 avenue du Général Leclerc, 92332 Châtillon Cedex, France
F. Lepoutre
Affiliation:
ONERA, Department of Solid Mechanics and Damage, B.P. 72, 29 avenue du Général Leclerc, 92332 Châtillon Cedex, France
D. Balageas
Affiliation:
ONERA, Department of Solid Mechanics and Damage, B.P. 72, 29 avenue du Général Leclerc, 92332 Châtillon Cedex, France
*
[email protected][email protected][email protected][email protected]
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Abstract

This article presents an application of a speckle interferometry technique with video doubling, called "shearography". This technique can be used for near real time imaging of Lamb waves in continuous or burst modes, revealing the presence of delaminations in a carbon epoxy plate. The amplitude of the displacements is measured with a typical uncertainty of the order of 1 nm. The nominal Lamb wave can be suppressed from the shearographic image by optical filtering, to show only the wave interaction with any defects that may exist in the plate. This method is especially advantageous for non-destructive testing.

Keywords

Type
Research Article
Information
The European Physical Journal - Applied Physics , Volume 9 , Issue 1 , January 2000 , pp. 69 - 73
Copyright
© EDP Sciences, 2000

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Footnotes

*

This subject was presented at C21′98 at Cachan the November 18-19, 1998.

References

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