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.