Utilization of heat treated wooden material in the production of garden sitting furniture with the aid of engineering design principles

In this study, the effect of heat-treatment, wood and joint type on mechanical performance of T-type mortise and tenon post-rail joints prepared using Black pine (Pinus nigra L.), Scotch pine (Pinus slyvestris L.), Oriental Spruce (Picea orientalis L.), Iroko (Choropher excelsa) and Ash (Fraxinus excelsior L.) was investigated. Total of 240 T-type joint specimens including 5 wood material x 2 joint types (mortise-tenon and blind mortise-tenon) x 2 heat-treatment properties x 2 test types (bending strength and tension strength) x 6 replicates were prepared.According to bending strength results, the maximum bending strength was found in Iroko (hardwood) for blind mortise and tenon joints and Scotch pine (softwood) for mortise and tenon joints. In terms of joint stiffness, the maximum performance in joint stiffness was determined for Black pine for blind mortise and tenon joints and Scotch pine (softwood) for mortise and tenon joints. In analyzes of joint rigidity, the maximum performance was found in Black pine for blind mortise and tenon joints.The results of tension test showed that the maximum value of tension strength was obtained in Black pine (softwood) for blind mortise and tenon joints and Iroko (hardwood) for mortise and tenon joints.Mechanical performance of heat-treated wood material used to produce garden sitting furniture in terms of both tension and bending interactions were investigated. It was found that heat-treatment, wood and joint type had a significant effect on T-type mortise and tenon post-rail joints. In general, for garden sitting furniture constructions to be produced with heat-treated Black pine was found to be suitable using with blind mortise and tenon joints.