Guided wave based debonding detection in CFRP-reinforced steel structures

Jingrong Li, Ye Lu

Research output: Chapter in Book/Report/Conference proceedingConference PaperOther


Carbon fibre reinforcement polymer (CFRP) has proved to be effective in strengthening the ageing steel structures due to its outstanding properties. However, the debonding problem, which may occur at the interface during the installation stage or service life, will highly influence the performance of the retrofitted structures. In this paper, to achieve the detection of debonding, numerical simulation was first performed to verify the feasibility of guided wave based structural health monitoring (SHM) method. FRP-reinforced steel plates with different sizes of debonding were simulated where surface mounted piezoelectric (PZT) wafers were employed to excite and collect the signals. The incident wave was chosen to be the anti-symmetrical mode, which is more sensitive to debonding because of its dominant out-of-plane motion. The time-of-flight (ToF) of the first arriving wave package in the received signals was extracted from the time domain. The simulation results indicated that the ToF decreases linearly with the increase of debonding size. The corresponding experiment was then carried out to verify the simulation results and a similar trend was obtained.

Original languageEnglish
Title of host publicationAdvances in Asset Management and Condition Monitoring, COMADEM 2019
EditorsAndrew Ball, Len Gelman, B.K.N. Rao
Number of pages9
ISBN (Print)9783030577445
Publication statusPublished - 2020
EventInternational Congress on Condition Monitoring and Diagnostic Engineering Management 2019 - Huddersfield, United Kingdom
Duration: 3 Sep 20195 Sep 2019
Conference number: 32nd

Publication series

NameSmart Innovation, Systems and Technologies
ISSN (Print)2190-3018
ISSN (Electronic)2190-3026


ConferenceInternational Congress on Condition Monitoring and Diagnostic Engineering Management 2019
Abbreviated titleCOMADEM 2019
CountryUnited Kingdom
Internet address


  • Debonding detection
  • Finite element method
  • FRP-reinforced steel structures
  • Guided waves
  • Structural health monitoring

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