Document Type : Research Paper

Authors

• amir lashgari ¹
• Peyman Sinambari ²

¹ Assistant professor, Islamic Azad University, Karaj Branch, Department of Wood and Paper Science and Technology, Karaj, Iran.

² Graduate student, Islamic Azad University ,Karaj Branch, Department of Wood and Paper Science and Technology, Karaj, Iran

Abstract

Effects of screw length (2, 2.5,3 inch), wood species (beech, alder, white spruce), and two screw interval (2, 2/5 cm) on bending strength of the T-type joints were investigated. In order to fabricate the T –shaped joints, dimensions of the parts were determined as 15*5/5*2/5 cm. From  the above variables, 18 combinations were reached. Four replications, and a total of 72 specimens were made and the mechanical strength of the specimens were measured by mechanical testing machine. Results indicated that the beech joints with 3-inch length screws had the highest bending strength, while the lowest bending strength was observed in spruce wood with 2-inch length screws. The study revealed statistically significant differences between the wood species, while there were not any difference between screw interval and bending resistance.

Keywords

• T- joints
• Bending strength
• screw length
• beech
• ALDER
• Spruce