Use of acoustic emission to dicriminate damage modes in composite-antenna-structure during buckling loading
Résumé
This paper investigates failure modes in composite-antenna-structures by using Acoustic
Emission (EA) with a multivariable parameter: wave form, FFT diagram, peak power,
frequency centroid, absolute energy, average frequency, peak frequency, duration and
amplitude. Tensile and buckling test were preformed to investigate damage accumulation in
composite laminate, while ARCAN-MINES test was used to characterize the delamination
modes in adhesive joints. Multivariable method enabled the identification and the
classification of AE signals belonging to fibre breakage, fiber/matrix debonding, matrix
cracking and delamination during tensile and buckling loading. Peak frequency is able to
classify damage modes occurring from the composite part and from the adhesive joint.
ARCAN-MINES test shows that a similar signal was observed for all modes of delamination.
Finally, the validation of AE clustering has been made on circular holed composite antenna
plates under buckling loading. Damage mode and location of AE clustering show a good
correlation with experimental results.