Eventos Anais de eventos
COBEM 2021
26th International Congress of Mechanical Engineering
Determination of Physical Coefficients by Monitoring Deformation
Submission Author:
Fernanda Novaes Santos , SP , Brazil
Co-Authors:
Fernanda Novaes Santos, Mauro Machado de Oliveira, Paulo Henrique Lixandrão Fernando, Kelly Cristina de Lira Lixandrão, Daniel Pezza Tchernov
Presenter: Fernanda Novaes Santos
doi://10.26678/ABCM.COBEM2021.COB2021-1015
Abstract
The digital image correlation (DIC) is a non-contact optical measurement technique. This technique consists of comparing sequential images of a surface filled with a random pattern, that can be to allow information to deformation and displacement of components body. The aim of this works is to determine the mechanical properties of different materials trough the analysis of deformation in a free software that uses DIC technology so-called GOM Correlate. Therefore, samples were obtained from ordinary plastic bags, in which the random pattern was applied. In this step, in order to guarantee a satisfactory analysis, it was necessary for the pattern to present a sharp contrast and for the surface to be matte, avoiding reflections that compromise the correlation. The tests were then carried out by subjecting the specimens to traction and capturing images during the process. This procedure allowed observing the deformation region through a color scale and obtaining quantitative data on the deformation along a given cross section. The results show that the samples underwent a high elongation, within the maximum extension allowed by the device, being also visible of the phenomenon of constriction. It is concluded that such observations are in agreement with the typical behavior of the tests material, that for plastic bags it is mainly high-density polyethylene (HDPE) and that adequate surface preparation is essential to determine reliable results. In addition, it was possible to confirm that the application of the DIC can be carried out at a low cost to determine the properties of certain material, in this case, in a simple manual device.
Keywords
Digital Image Correlation (DIC), Tensile Test, deformation analysis
