Abstract:
Full-field deformation measurements are crucial
as it offers detailed information to better understand both micro
and macroscopic nature of material behavior. The practice of
employing Digital Image Correlation (DIC) based measuring
techniques in experiments has increased due to its ability to
generate full-field deformation information with minimal effort.
Even though DIC systems are commercially available, the
affordability of those systems is questionable in local context due
to high capital costs. Most of the past studies related to DIC were
focused on testing concrete, masonry and metallic alloy
specimens, and little effort has been made on materials with
recoverable large elongations. This paper presents a 3D fullfield
deformation measuring system that has been developed
with a special focus on hyperelastic materials. The proposed
system requires two common digital cameras for image
acquisition, as the depth information is of interest. Images are
then processed using the MATLAB-based algorithm developed
to produce the full-field deformation map. Hyperelastic
specimens of two different thicknesses were tested over 70%
strain and the accuracy of the strain measurement using the
proposed system is validated against physical measurements.
The results have shown that the strains can be captured to an
accuracy greater than 90% using the proposed technique.
Citation:
S. Nadarajah, V. Arulkumar and C. Mallikarachchi, "3D Full-Field Deformation Measuring Technique Using Digital Image Correlation," 2020 Moratuwa Engineering Research Conference (MERCon), 2020, pp. 1-6, doi: 10.1109/MERCon50084.2020.9185343.