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, cilt.140, ss.192-201, 2016 (SCI İndekslerine Giren Dergi) identifier identifier


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.