Dynamic and static testing methods for shear modulus of oriented strand board

Abstract

In this work, a new dynamic and a new static method for testing shear modulus of oriented strand board (OSB) are proposed, respectively. ANSYS software was used to calculate the mode shape coefficient of the OSB free plate and cantilever plate specimens, and the relationship of the mode shape coefficient depending on the length-to-width and the width-to-thickness ratios of the plate specimen was given. According to the stress and strain analysis of static torsion of the square plate, the principle of static square-plate torsional test for testing the shear modulus of orthotropic materials was described and the scheme of pasting the strain gauges in the direction of ±45° was proposed to ensure the accuracy of testing static shear modulus of OSB. The correctness of the new method for dynamically testing OSB shear modulus was verified by static square-plate torsional test. The longitudinal elastic modulus Ex, transverse elastic modulus Ey, elastic modulus in the 45° direction E45°, shear modulus in the plane Gxy and shear modulus in the 45° direction G45° were measured dynamically. The measured results of Ex/Ey = 2.88 and G45° < Gxy for OSB indicate that the orthotropy of OSB cannot be simply dealt with as a unidirectional composite.