Impact damage detection in composite chiral sandwich panels

A. Klepkal, W. J. Staszewski*, T. Uhl, D. Di Maio, F. Scarpa, K. F. Tee

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

19 Citations (Scopus)

Abstract

This paper demonstrates impact damage detection in a composite sandwich panel. The panel is built from a chiral honeycomb and two composite skins. Chiral structures are a subset of auxetic solids exhibiting counterintuitive deformation mechanism and rotative - but not reflective - symmetry. Damage detection is performed using nonlinear acoustics, involves combined vibro-acoustic interaction of high-frequency ultrasonic wave and low-frequency vibration excitation. High- and low-frequency excitations are introduced to the panel using a low-profile piezoceramic transducer and an electromagnetic shaker, respectively. Vibro-acoustic modulated responses are measured using laser vibrometry. The methods used for impact damage detection clearly reveal de-bonding in the composite panel. The high-frequency "weak" ultrasonic wave is also modulated by the low-frequency "strong" vibration wave when nonlinear acoustics is used for damage detection. As a result frequency sidebands can be observed around the main acoustic harmonic in the spectrum of the ultrasonic signal.

Original languageEnglish
Title of host publicationStructural Health Monitoring II
PublisherTrans Tech Publications Ltd
Pages160-167
Number of pages8
ISBN (Print)9783037854433
DOIs
Publication statusPublished - 2012
Externally publishedYes
Event2nd International Conference on Smart Diagnostics of Structures 2011 - Cracow, Poland
Duration: 14 Nov 201116 Nov 2011
Conference number: 2

Publication series

NameKey Engineering Materials
Volume518
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

Conference2nd International Conference on Smart Diagnostics of Structures 2011
CountryPoland
CityCracow
Period14/11/1116/11/11

Keywords

  • Chiral structures
  • Impact damage detection
  • Nonlinear acoustics
  • Piezo-ceramic transducers

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