Effect of wood species and glue type on contact stresses in a mortise and tenon joint

Abstract

New technologies for wood building construction continue to employ various profileadhesive joints, with mortise and tenon joints being the most popular. Their strength depends both on the wood species and type of the applied glue, as well as the execution accuracy of individual elements. The aim of the performed experiments was to determine the size of normal stresses in places of mutual pressures of the tenon and mortise and the impact of the change of wood species and the type of glue (or lack of glue) applied to the joint on the value of those stresses. It was established, on the basis of numerical calculations, that the phenomena of the tenon and mortise contact are caused both by the bending of the tenon as well as by the torsion of the glue bond. Stresses in the direction perpendicular to the fibre course generating pressures exceeding wood compression strength turned out to be the most dangerous for the tenon and mortise joint. The value of the linear elasticity modulus of the glue bond exerts a decisive influence on the stress values caused by the mutual pressures of the elements of the examined joint.

Effect of Veneer Composition on the Stiffness and Stress of Laminated Wood

“…are presented in Tab. 1 [10]. Appropriate elastic properties for analysis in the LT plane were selected.…”

“…Elastic properties of beech (Fagus silvatica L.) [10] Investigations were conducted on the laminated beams with six different veneer compositions. Orientation and thickness of veneers are shown in Fig.…”

Design Methodology of New Furniture Joints

“…In the case of skeleton furniture, it can be said that a considerable number of furniture joints consists of a tenon and mortise (Dzięgielewski and Zenkteler, 1975 Smardzewski, 2008Smardzewski, , 2015. Such joints are characterised by very good technical properties as well as by the fact that they are invisible outside.…”

Stiffness Analysis of Wood Chair Frame

“…A 0,1 mm thick gap was placed between the tenon and the mortise in which a glue bond was formed. The selected elastic properties of the polyvinyl acetate (PVAC) glue are E=465,74 MPa and =0,29 [6]. The shoulder of the tenon was contact-connected to the wall of the mortise.…”

“…The limitations of numerical analysis are the complexity of numerical models related to the orthotropic properties of the applied materials and complexity of network geometry. As design and optimization of structure have been largely related to the design of the joint, an attempt has been made to replace whole structure analysis with the consideration of critical structural points (joint) only [5,6,7,8,9].…”