Particle Image Velocimetry for Estimating the Young’s Modulus of Wood Specimens

Abstract

Proposing technological innovations in the investigation of the structure and behaviour of wood is important to optimize its use. The assimilation of methods diffused in other areas, such as particle image velocimetry (PIV), can allow a rich range of information for different aspects. The aim of this study was to estimate the Young's modulus using the PIV technique, independently of the wood density. The Young modulus value was obtained by universal testing machine, transversal vibration and PIV technique. Cedrela spp. and Eucalyptus cloeziana wood specimens were analyzed and their Young modulus were compared and correlated. The PIV technique presented mean Young's modulus values statistically equal to those of the universal testing machine. The standard error of prediction from PIV approach was 0.46 and 0.97 GPa for Young's modulus estimates for Cedrela spp. and Eucalyptus cloeziana wood, respectively. v.25 n.2 2019 241 CERNE GUEDES et al.

Particle image velocimetry technique and ultrasound method to obtain the modulus of elasticity of Bertholletia excelsa wood

“…Other research has already proven the efficiency of the PIV technique and ultrasound method, compared to conventional methodologies, to estimate physical or mechanical parameters in wood (Pereira et al 2019, Guedes et al 2019, Gonçalez et al 2001, Ribeiro et al 2013.…”

“…These images are processed in a computational algorithm that calculates the displacement that occurred on the surface of the studied object (Pereira et al 2019). Guedes et al (2019) determined the modulus of elasticity of Cedrela spp. and Eucalyptus cloeziana wood submitted to static flexion using the PIV technique.…”

Particle image velocimetry technique for analysis of retractibility in woods of Pinus elliottii

“…Using the equations, it is possible to estimate the reduction in the area of Pinus elliottii wood during drying. Research has shown satisfactory results of the PIV technique compared to conventional methods, with respect to physical and mechanical parameters in wood (Braga Jr et al 2015, Pereira et al 2018, Guedes et al 2019). In the literature, a value of 3,85 % and 3,44 % was found for the radial contraction of Pinus elliotttii wood in a natural drying process until equilibrium moisture content, measured with a pachymeter (Acosta et al 2019, Juizo et al 2015.…”

“…These images are processed in a computational algorithm that calculates the displacements that occurred on the surface of the object studied. This technique was originally developed in the field of fluids and gases, but authors have studied its application for solid materials (Braga Jr et al 2015, Souza et al 2014, Pereira et al 2018, Guedes et al 2019. It is a technique capable of measuring deformations in situations where there is a variation between the final and initial position of the object and obtaining the mechanical properties.…”