MATERIALS INTERNATIONAL | https://materials.international | 318 Cite This Article: Ayrilmis, N.; As, N.; Dündar, T.; Şendağ, A. Determination of Bending Moment of L-Type Corner Joints Used in Chair Production and Their Effect on Mechanical Performance of Chairs. Mat Int 2020, 2, 0318-0323. https://doi.org/10.33263/Materials23.318323 Determination of Bending Moment of L-Type Corner Joints Used in Chair Production and Their Effects on Mechanical Performance of Chairs Nadir Ayrilmis 1,* , Nusret As 1 , Türker Dündar 1 , Akin Şendağ 2 1 Istanbul University-Cerrahpaşa, Faculty of Forestry, Bahcekoy, 34473, Sariyer, Istanbul, Turkey 2 Izmir Katip Celebi University, Faculty of Forestry, Cigli, 35620, Izmir, Turkey * Correspondence: nadiray@istanbul.edu.tr; Scopus ID: 8654839700 Abstract: The objective of the study was to determine the mechanical performance of L-type joints and chairs produced using mortise-tenon and dowel-joint techniques by diagonal compression tests and diagonal tensile tests. Two types of corner-joints were prepared from beech wood at the laboratory, which was mortise-tenon and dowel joints. Two grooved dowels were used in the dowel joints. The corner-joint samples were subjected to diagonal compression and tensile tests at the universal testing machine. The chairs were produced from these corner-joints, and their mechanical performance tested using furniture test equipment in accordance with EN 1728 standard. The mortise-tenon joint in the diagonal tensile testing had the highest bending moment with an average value of 673.28 Nm while the dowel-joint had the lowest bending moment in the diagonal compression testing with an average value of 75.36 Nm. A load-bearing capacity of 673.28 Nm was obtained from diagonal tensile testing, and 95.54 Nm was obtained from the diagonal compression test. All the chairs produced from mortise-tenon or dowel-joint did not show any failure at the corner-joint area. The chairs produced with a mortise-tenon joint had a better mechanical performance as the corner-joints test results were considered. The mortise-tenon joint showed better mechanical performance than the dowel-joint technique. The load-bearing capacities obtained from the diagonal tensile testing were found to be higher than those obtained from the diagonal compression test. The chairs produced from mortise- tenon or dowel-joint did not show any failure at the corner-joint area after the test specified in EN 1728 standard. Keywords: Corner joint; mortise-tenon joint; dowel-joint; mechanical performance; chair. © 2020 by the authors. This article is an open-access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/). 1. Introduction Furniture can be characterized as an aesthetic and functional consumption product. Furniture designs are expected to meet the functional purposes loaded, as well as satisfy the aesthetic demands of users. In addition, furniture should be economical in terms of material and production Volume 2, Issue 3, Pages 0318-0323 2020 Article ISSN: 2668-5728 https://materials.international https://doi.org/10.33263/Materials23.318323 Received: 28.05.2020 Accepted: 12.06.2020 Published: 15.06.2020