Aluminium skins + Aluminium honeycomb sandwich, perfect and defected (as resulting from coin tapping), subjected to compression tests.
Acoustic emission monitoring during step loading (each step 10% of ultimate stress)
(PAC LOCAN-AT AE system)
IR transient thermography monitoring using heating plate (AVIO thermal camera)
Acoustic emission was absent during holding at constant load up to 50% ultimate stress
Thermography during 15 sec. transient after heating for 3 sec. the defects were apparent as areas with different conductivity.
PRESENTED AT AIPnD CONFERENCE (TORINO 1995)
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