Journal
COMPOSITES PART B-ENGINEERING
Volume 80, Issue -, Pages 291-298Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compositesb.2015.06.010
Keywords
Prepreg; Impact behaviour; Non-destructive testing; Ultrasonic Lamb waves
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This work assesses the suitability of the two zero-order Iamb wave modes to detect multiple barely-visible impact damage in composite material. Three specimens were subjected to damage at three different low-energy levels and one was left as an undamaged reference sample. Ultrasonic Lamb wave modes were selectively generated by surface-bonded piezoceramic wafer transducers in two tuned configurations. By using an algorithm based on the Akaike Information Criterion the time-of-flight of the Lamb modes was determined, allowing their threshold detection capabilities for the studied application to be successfully benchmarked. The results were consistently validated by digital shearography, ultrasonic C-scan and optical microscopy. A study of the effects on structural integrity was completed with an assessment of the damping ratio and residual bending strength proving to be sensitive parameters to the induced damage. (C) 2015 Elsevier Ltd. All rights reserved.
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