بررسي تاثير ارتفاع و ضخامت زبانه اتصال ساخته شده از گونه هاي راش و ممرز روي مقاومت خمشي اتصال كام وزبانه

A Study of the Effects of height and Thickness of Tenon Made Out of Beech and Hornbeam on bending Strength of Mortise and tenon joint

The aim of this study was investigating the parameters of mortise and tenon joint made out of beech and hornbeam and develop formula to estimate ultimate bending strength. Mortis and tenon joint, one of the joints type, in placed in both form of corner and cross. In furniture industry, Mortis and tenon joint is widely used, because of its low cost and easy utilization. In this study, the effects of tenon height 2.5 ,3.5 and 5 cm, shoulder width 0/125, 0/25 and 0/375 cm on the resistance of Mortis and tenon against the ultimate bending strength were investigated. The results showed that the highest ultimate bending strength of Mortis and tenon in hornbeam possessed to the 5 cm tenon height and 0/25 shoulder width. Finally, it was found that the ultimate bending strength ( M) of the joint could be predicted by means of the formula M=2/55x£x(0/24d +0/57/z)xBxCxD, where M = ultimate bending strength , S = is shear strength of the wood, d = rail rail, h - tenon height, B = shoulder width factor, C = adhesive factor, D = tenon fit factor