Detection of stiffness degradation in laminated composite plates by filtered noisy impact testing

Sang Youl Lee, Guillermo Rus, Taehyo Park

Research output: Contribution to journalArticle

7 Citations (Scopus)

Abstract

The purpose of this paper is to detect damage (stiffness degradation) of laminated composite plates from noisy impact response data. The combined finite element method (FEM) with five degrees of freedom (DOF) and the advanced noise filtering algorithm described in this paper may allow us not only to detect the deteriorated elements but also to find their locations and the extents. A first order shear deformation theory (FSDT) is used to predict the structural behavior and to detect damage of laminated composite plates. The filtering procedure is designed by means of a wavelet decomposition together with a selection of the measuring points, and the optimization criterion is constructed on an estimate of the probability of detection using genetic algorithms. All these techniques are applied for the first time to composites. The effects of filtered noise associated with the uncertainty of measurements due to the complex nature of composites are considered for different layup sequences, number of layers, and length-thickness ratios. Several numerical results show that the noise filtering system is computationally efficient in identifying stiffness degradation for complex structures such as laminated composites.

Original languageEnglish
Pages (from-to)1-15
Number of pages15
JournalComputational Mechanics
Volume41
Issue number1
DOIs
StatePublished - 2007 Jan 1

Fingerprint

Impact testing
Laminated Plates
Laminated Composites
Composite Plates
Laminated composites
Noise Filtering
Stiffness
Degradation
Testing
Damage
Composite
Probability of Detection
Wavelet decomposition
Wavelet Decomposition
Combined Method
Deformation Theory
Shear Deformation
Composite materials
Complex Structure
Shear deformation

Keywords

  • Composite plate
  • Finite element method
  • Impact testing
  • Inverse problem
  • Noise filter
  • Wavelet analysis

Cite this

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Detection of stiffness degradation in laminated composite plates by filtered noisy impact testing. / Lee, Sang Youl; Rus, Guillermo; Park, Taehyo.

In: Computational Mechanics, Vol. 41, No. 1, 01.01.2007, p. 1-15.

Research output: Contribution to journalArticle

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