NOVA METODOTOLOGIA PARA CLASSIFICAÇÃO DE PEÇAS DE MADEIRA POR MEIO DO INCREMENTO DE MASSA NA TÉCNICA DE VIBRAÇÃO TRANSVERSAL

Abstract

This is a study on the potential use of smartphones, through a new methodology of transverse vibration testing with an increase in mass, to determine the dynamic modulus of elasticity. The objective is to experimentally verify the correlation between the longitudinal modulus of elasticity, determined through the static bending test, in parts of varying dimensions, and the dynamic modulus of elasticity, determined by a new transverse vibration test methodology. To determine the modulus of elasticity using the transverse vibration method with mass increment, the fast Fourier transform (FFT) was used, which converts the acceleration signal obtained from the smartphone from the time domain to the frequency domain. With the frequencies determined, the dynamic longitudinal elasticity modulus is calculated according to the new methodology under study. As a comparison, static bending tests were carried out to validate the results. Analysis of variance was used and this analysis showed that there is no statistically significant difference between the modules obtained through the static bending test and the transverse vibration method by mass increment.