Variation of the Tensile Strength and the Modulus of Elasticity through the Thickness of Oriented Strand Lumber

Abstract

To evaluate and optimize new engineered wood products such as oriented strand lumber (OSL), it is necessary to investigate their mechanical properties and the influence of the manufacturing process on these mechanical properties. In a conventional manufacturing process, the vertical density profile (VDP) of OSL is typically nonuniform through its thickness. In this study, the relationships between VDP, tensile strength, and modulus of elasticity (MOE) through the thickness of OSL were investigated. The scope was primarily experimental. OSL specimens were sliced into thin layers, and tension tests performed with these layers. Based on the test results, tensile strength and MOE were determined and related to the respective density of each layer. Equations to predict tensile strength and MOE based on density were also developed.