Smart nonlinear acoustic based structural health monitoring system

Umberto Polimeno, Michele Meo, Darryl Almond

Research output: Contribution to journalArticlepeer-review

16 Citations (SciVal)


The objective of this work was to demonstrate the feasibility of nonlinear vibration/acoustic/ultrasonic diagnostic tools to be implemented in a structural health monitoring system for imaging damage. In particular, the sensitivity a second harmonic imaging technique (SHIT) based on material nonlinear elastic effect known as second harmonic generation (SHG) was investigated. Examples of the capability and limitations of the proposed damage detection process to detect and image barely visible impact damage (BVID) due to low velocity impact (<12J) are presented for various composite laminated. The presence of microcracks, debonding, delamination, etc… could induce the material to behave in a nonlinear elastic fashion and it is highlighted by the presence and amplitude of harmonics in the spectrum of the received signal. The results showed that the proposed SNIT methods appear to be highly accurate in assessing the presence and magnitude of damage with very promising future NDT and structural health monitoring applications. Moreover the technique was validated with two conventional NDT techniques: pulse thermography and thermosonic. The first failed in detecting the damage on the impact face, but delamination on back surface was localized. The second technique was capable of localising and quantifying the damage on the impacted surface agreeing well the results obtained using non linear method.
Original languageEnglish
Pages (from-to)426-434
Number of pages9
JournalAdvances in Science and Technology
Publication statusPublished - Sept 2008
Event3rd International Conference on Smart Materials, Structures and Systems - Emboding Intelligence in Structures and Integrated Systems, CIMTEC 2008 - Sicily, Italy
Duration: 8 Jun 200813 Jun 2008


  • Barely visible impact damage
  • Structural health monitoring systems
  • Non linear elastic material
  • Non-linear methods
  • Second-harmonic generations
  • Pulse thermographies
  • Received signals
  • Diagnostic tools
  • Low velocity impacts
  • Material nonlinear
  • Thermosonic
  • Detection process
  • Elastic effects
  • Second-harmonic imaging
  • Structural healths


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