A FEM Analysis of Mortise and Tenon Joint Within Chairs

Abstract

This paper presents an analysis of a basic model of wooden chair. The aim of the paper is to optimize chair itself as joints using finite element analysis. Contact forces and deformations of two mostly used joints in furniture industry: oval tenon and a mortise, and dowel and a hole was analysed. The theoretical analysis was performed using the finite elements method, whereas experimental verification of the results, was obtained by invasive methods by testing samples on rigidity and durability according to European norms. Verification of the obtained stresses and strains was carried out using strain gauges positioned on chair samples. During the production of test pieces types of fit and types of joints were varied. Presented results showed that connection between side rail and rear leg presents the most critical spot in chair construction. Comparative analysis of the results obtained by finite element method and rigidity tests, showed that setup of parameters during finite element analysis was well done and presents recommendations for further research.