Abstract
Several non-destructive testing techniques have been improved and tested in recent years. The non-destructive testing techniques using particle image velocimetry (PIV) and digital image correlation (DIC) differ from conventional testing techniques, as they allow making measurements indirectly. In this study, the elastic modulus in wood beams of Eucalyptus grandis and Pinus oocarpa were determined using PIV and DIC. The application of PIV and DIC techniques occurred during the static bending tests, when the displacements were also measured by the conventional method. The applied load values allowed calculating the elasticity modulus. In all regions of analysis, the mean values of the elasticity modulus found by the DIC, PIV and conventional method are statistically equivalent. It is concluded that the PIV and DIC testing techniques can be used to determine mechanical properties of wood.
Highlights
The non-destructive testing techniques are an alternative to conventional material characterization, as these techniques do not modify the material structure in a way that compromises its final use after the tests (Carrillo et al, 2019).For some time, non-destructive methods have been used to characterize different materials (Ettelaei et al, 2019; Osuna-Sequera et al, 2019)
The surface of the specimens was marked with black ink (Figures 2A and 2B) to allow, during the image processing by the particle image velocimetry (PIV) and digital image correlation (DIC) methods, the algorithms to identify the regions of interest and measure their displacements according to the load application on the static bending test
The elasticity modulus was determined by the slope of the secant line to the load × displacement curve in the mid-span, with the deformation values calculated by the PIV, DIC algorithms and the load values obtained from the UTM, according to the American Society for Testing and Materials (1995) ASTM D143-94
Summary
The non-destructive testing techniques are an alternative to conventional material characterization, as these techniques do not modify the material structure in a way that compromises its final use after the tests (Carrillo et al, 2019). The particle image velocimetry (PIV) technique allows obtaining the deformation from specific points in the material and is capable of measuring the mechanical properties. The PIV and DIC techniques are non-destructive optical testing techniques that can be applied to service structures (in loco), becoming options to obtain reliable results of the mechanical behavior of materials subjected to loading, such as wood (Pereira et al, 2018). The elasticity modulus in Eucalyptus grandis and Pinus oocarpa wood specimens using the PIV and DIC techniques were determined, and their accuracy and applicability in relation to the conventional testing technique were verified
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