Material characterization of laminated composite materials using a three-point-bending technique

Tai-Yan Kam*, C. M. Chen, S. H. Yang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

13 Scopus citations


A three-point-bending technique is presented for identifying the elastic constants of laminated composite materials. In the proposed technique, three strains in the axial, lateral, and 45° directions on the bottom surface at the mid-span of a symmetric angle-ply beam subjected to three-point-bending testing are measured for elastic constants identification. The narrow beam theory together with the trial elastic constants is used to predict the theoretical strains of the beam. The theoretical and experimental strains of the beams are then used in a stochastic optimization method to identify the elastic constants of the beam. The accuracy and applications of the proposed technique are demonstrated by means of a number of examples on the elastic constants identification of graphite/epoxy (Gr/ep) or glass/epoxy (Gl/ep) laminated composite materials. The effects of specimen aspect ratio and thickness on the accuracy of the proposed method are investigated.

Original languageEnglish
Pages (from-to)624-628
Number of pages5
JournalComposite Structures
Issue number4
StatePublished - 1 May 2009


  • A. Composite beam
  • A. Composite materials
  • C. Finite element method
  • C. Identification
  • C. Optimization
  • D. Experimental verification

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