39 Citations (Scopus)

Abstract

A damage assessment methodology using a time-frequency signal processing technique is presented in this article. Delaminations are detected in composite structures with multiple stiffeners. Because Lamb waves are complex in nature, due to wave dispersion and scattering, a robust signal processing technique is required to extract features from Lamb wave signals. In this article, the matching pursuit decomposition algorithm is used for extracting wavelets from the Lamb wave signals in the time-frequency domain. A small time-frequency atom dictionary is defined to avoid the exhaustive search over the time-frequency domain and to reduce the computation costs. The propagation characteristics of Lamb waves in stiffened composite panels are investigated. The delaminations are detected by identifying the converted Lamb wave modes introduced by the structural imperfection. A two-step damage detection approach, which uses both pulse-echo and pitch-catch active sensing schemes, is developed for the identification of delaminations. The delamination is quantified using a signal energy-based damage index. The matching pursuit decomposition algorithm is further used to localize the delamination position by solving a set of nonlinear equations. The results show that the matching pursuit decomposition algorithm can be used to identify and localize the seeded delaminations in composite structures with complex geometries and material properties.

Original languageEnglish (US)
Pages (from-to)397-413
Number of pages17
JournalJournal of Intelligent Material Systems and Structures
Volume23
Issue number4
DOIs
StatePublished - Mar 2012

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Carbon fiber reinforced plastics
Delamination
Surface waves
Composite materials
Composite structures
Decomposition
Signal processing
Damage detection
Glossaries
Nonlinear equations
carbon fiber reinforced plastic
Materials properties
Scattering
Atoms
Defects
Geometry
Costs

Keywords

  • delamination
  • localization
  • matching pursuit decomposition
  • quantification

ASJC Scopus subject areas

  • Materials Science(all)
  • Mechanical Engineering

Cite this

Damage assessment of CFRP composites using a time-frequency approach. / Liu, Yingtao; Yekani Fard, Masoud; Chattopadhyay, Aditi; Doyle, Derek.

In: Journal of Intelligent Material Systems and Structures, Vol. 23, No. 4, 03.2012, p. 397-413.

Research output: Contribution to journalArticle

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