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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 mortisetenon or dowel-joint did not show any failure at the corner-joint area after the test specified in EN 1728 standard.

Determination of Bending Moment of L-Type Corner Joints Used in Chair Production and Their Effects on Mechanical Performance of Chairs