Detection of edge delamination in surface adhered active fiber composites

Dwo Wen Wang, Ching-Chung Yin*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


A simple method has been developed to detect the bonding condition of active fiber composites (AFC) adhered to the surface of a host structure. Large deformation actuating capability is one of important features of AFC. Edge delamination in adhesive layer due to large interfacial shear stress at the free edge is typically resulted from axial strain mismatch between bonded materials. AFC patch possesses very good flexibility and toughness. When an AFC patch is partially delaminated from host structure, there remains sensing capability in the debonded part. The debonding size can be determined through axial resonance measured by the interdigitated electrodes symmetrically aligned on opposite surfaces of the patch. The electrical impedance and modal response of the AFC patch in part adhered to an aluminum plate were investigated in a broad frequency range. Debonding ratio of the AFC patch is in inverse proportion to the resonant frequency of the fundamental mode. Feasibility of in-situ detecting the progressive delamination between AFC patch and host plate is demonstrated.

Original languageEnglish
Pages (from-to)633-644
Number of pages12
JournalSmart Structures and Systems
Issue number6
StatePublished - 1 Jan 2009


  • Active fiber composite
  • Delamination
  • Electric impedance
  • Resonance

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