Carl Zeiss Optotechnik GmbH - Optische Messtechnik
%AM, %14 %041 %2014 %02:%Sep

Shearography on Aluminium Honeycomb Material

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SYSTEM
STEINBICHLER ISISmobile 3100

INTRODUCTION
Aircraft structures are facing high stress during the usage in their lifetime. Therefore, a constant control and maintenance of those structures is necessary. In this application report possible damages to aircraft structures on aluminium  honeycomb panel was simulated. Such as top-layer – core delaminations, back-layer core delaminations and Impact damages. An aluminium honeycomb core panel (400mm x 400mm x 27mm) was used for the measurements.

APPROACH
The specimen was tested using the Steinbichler shearography system ISISmobile 3100 with vacuum excitation.

RESULTS
Vacuum Loading Test
For the vacuum loading, a reference pressure of -40 mbars was set. After having reached the pressure level, the reference image was initiated. Then, the loading pressure of additional -40 mbars was applied to the structure.

Results show that the simulated top layer – core delamination is superposing the results of the other two damages that are slightly visible. Rescaling and exclusion of the superposing defects makes those defects clearly visible.

SUMMARY
The results of these images show that shearography is able to detect material anomalies in with different sizes even on the opposite side of a 27 mm aluminium honeycomb material.
As the main advantages of shearography are speed, full-field images (A4 or A3 paper size measurement fields) and contact-less operation, this method means a step forward in carrying out faster maintenance cycles and, thus, represents a reliable tool for the quick and reliable assessment of aircraft structures.

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