Effects of Different Joint Techniques on Withdrawal Strength of T-Type Furniture Joints

Abstract

In this study, withdrawal strengths of T-type furniture joints prepared from different wood species and connected with different joint methods were compared. Specimens were constructed of Turkish beech (Fagus orientalis L.), Scotch pine (Pinus sylvestris L.), Sessile oak (Quercus petraea Liebl), Anatolian chestnut (Castanea sativa Mill) and Common Walnut (Juglans regia L.). Dowel and mortise and tenon joints were considered as glued joints, while screwed joint, minifix and maxifix joints were considered as without glue joints. In the glued joints, polyvinylacetate (PVAc) and polyurethane (Pu) adhesives were utilized. A total of 350 specimens that included 5 wood species, 7 joint methods, and 10 replications for each were prepared and tested under static direct withdrawal loads. As a result of the tests, the highest withdrawal strengths were obtained with oak while the lowest withdrawal strengths were obtained with scotch pine and Anatolian chestnut. Mortise and tenon joints were showed the best results while minifix and maxifix joints were yielded the worst among the connection types. For glued joints, PVAc gave higher values than Pu and mortise and tenon joints gave better results than dowel joints.