RT Journal Article
SR 00
A1 Canal Casado, Luis Pablo
A1 González Martínez, Carlos Daniel
A1 Molina Aldareguía, Jon M.
A1 Segurado Escudero, Javier
A1 Llorca Martinez, Francisco Javier
T1 Application of digital image correlation at the microscale in fiber-reinforced composites
JF Composites Part A: Applied Science and Manufacturing
YR 2012
FD 2012-10
VO 43
IS 10
SP 1630
OP 1638
AB Digital image correlation (DIC) is applied to analyzing the deformation mechanisms under transverse  compression in a fiber-reinforced composite. To this end, compression tests in a direction perpendicular  to the fibers were carried out inside a scanning electron microscope and secondary electron images  obtained at different magnifications during the test. Optimum DIC parameters to resolve the displacement  and strain field were computed from numerical simulations of a model composite and they were  applied to micrographs obtained at different magnifications (250_, 2000_, and 6000_). It is shown that  DIC of low-magnification micrographs was able to capture the long range fluctuations in strain due to the  presence of matrix-rich and fiber-rich zones, responsible for the onset of damage. At higher magnification,  the strain fields obtained with DIC qualitatively reproduce the non-homogeneous deformation pattern  due to the presence of stiff fibers dispersed in a compliant matrix and provide accurate results of the  average composite strain. However, comparison with finite element simulations revealed that DIC was  not able to accurately capture the average strain in each phase.
PB Elsevier
SN 1359-835X
LK http://oa.upm.es/16007/
UL http://www.sciencedirect.com/science/article/pii/S1359835X1100220X