ANALYSIS OF STRESS DISTRIBUTION AND PREDICTION OF FAILURES FOR T-SHAPED WOOD SCREW JOINTS USING THE FINITE ELEMENT METHOD (FEM)
amir Lashgari, Seyyed Khalil Hosseini Hashemi
In this study, finite element analysis was used to investigate the deflection, stiffness, and failure characteristics of case furniture. Tests were performed to evaluate the tensile stress distribution in screw joints under tensile load. To meet this objective, the effects of two screw diameters (4 and 5 mm) were studied using beech (Fagus orientalis), alder (Alnus subcordata), and white spruce (Picea Abies) wood species. The finite element analysis method (FEM) with ANSYS software was utilized to evaluate the distribution and concentration of stress in the joints, as well as variations of stress due to the mentioned variables. In order to perform the numerical computations, the T-shaped specimens had dimensions of 50 × 50 × 25 mm to meet EN 789 modified standard requirements, and the screw models had diameters of 4 and 5 mm, with a length of 50 mm. The results showed that stress concentration was between the screw threads. The stress in the joint model was less than that of the screw model. The larger screw diameter experienced a larger amount of stress but did not follow a constant trend, showing that screw diameter should be proportional to surface area. It was concluded that the finite element method is a suitable method with the use of exact numerical calculations to check the loads imposed on the structures. The FEM can be used as a suitable non-destructive technique for determining structural strength at various times.
Tensile stress distribution; Screw joint; Beech; Alder; White spruce; Finite element method (FEM)