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


Mehdikhani M., Aravand M., Sabuncuoglu B., Callens M. G. , Lomov S. V. , Gorbatikh L.

COMPOSITE STRUCTURES, vol.140, pp.192-201, 2016 (SCI-Expanded) identifier identifier

  • Publication Type: Article / Article
  • Volume: 140
  • Publication Date: 2016
  • Doi Number: 10.1016/j.compstruct.2015.12.020
  • Journal Name: COMPOSITE STRUCTURES
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Page Numbers: pp.192-201
  • Hacettepe University Affiliated: No

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. (C) 2016 Elsevier Ltd. All rights reserved.