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ANALYSIS OF STRESS DISTRIBUTION AND PREDICTION OF FAILURE IN THE WOOD JOINT BY SCREW USING THE FINITE ELEMENT METHOD (FEM)

Seyyed Khalil Hosseinihashemi, Amir Lashgari

Abstract


Finite element methods of analysis were used to investigate the deflection, stiffness, and failure characteristics of furniture cases. This study was 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 method (FEM) and ANSYS software were used to evaluate the distribution and concentration of stress in the joints as well as the variation trend of stress due to the mentioned variables. In order to perform the numerical computations, the T joint model had dimensions of 50 × 50 × 25 mm 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 for the screw model.  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 and shows that screw diameter should be proportional to surface area. It was concluded that the finite element method is a general and 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


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