Full-field strain measurements at the micro-scale in fiber-reinforced composites using digital image correlation

Mahoor Mehdikhani, M. Ali Aravand, Baris Sabuncuoglu, Michael Callens, Stepan V. Lomov, larissa Gorbatikh

Research output: Contribution to journalArticlepeer-review

84 Citations (Scopus)

Abstract

Few studies have been conducted to monitor inter-fiber deformations in fiber-reinforced composites. In the present work, we demonstrate full-field strain measurements in the composites at the micro-scale, using digital image correlation (DIC). The study is performed on a unidirectional glass fiber reinforced composite loaded in transverse three-point bending inside an environmental scanning electron microscope. A nano-scale random speckle pattern of high quality is created. Validity of the measured fields is assessed against results of a finite element (FE) model with boundary conditions retrieved from the experiment. A good agreement is found between the DIC-measured and FE-predicted results. The precise recognition of very small-scale strain concentrations requires enhancement of the correlation process and removal of microscopy imperfections. The investigated methodology shows promise for real-time deformation measurements in composites at the micro-scale.
Original languageEnglish
Pages (from-to)192-201
Number of pages9
JournalComposite Structures
Early online date30 Dec 2015
DOIs
Publication statusPublished - 01 Apr 2016

Keywords

  • igital image correlation (DIC)Scanning electron microscopy (SEM)Micro-mechanicsPolymer-matrix composites (PMCs)Finite element analysis (FEA)

ASJC Scopus subject areas

  • Mechanics of Materials
  • Polymers and Plastics
  • Ceramics and Composites

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