APPROACH FOR ANALYSIS OF STRAINS AND STRESSES IN AN UPHOLSTERED FURNITURE FRAME USING FINITE ELEMENTS BASED SYSTEM

An approach for analysis of strains and stresses in an upholstered furniture frame using finite elements based system is defined. A linear static analysis of the discrete 3D model of one-seat sofa frame was carried out with CAE system Autodesk Simulation Mechanical (R) by the method of finite elements (FEM) simulating light-service loading of the sofa frame. The orthotropic material characteristics of pine solid wood (Pines sylvestris L.) for the rails and particle boards (PB) for the side plates are considered in the analysis. FEA was performed with regard to laboratory established coefficients of rotational stiffness of used staple corner joints in the sofa frame case butt joints and end to face butt joints with staples and PVA glue. As results the distribution of stresses (von Mises and principal), displacements (linear and rotational) and equivalent strains in the discrete 3D model of upholstered furniture frame (skeleton) with staple corner joints are presented and analysed. The regions exposed to the largest strains and stresses are identified. The created new approach for defining of stress-strain state in the discrete 3D model of upholstered furniture frame, taking into account pliability of staple corner joints with CAE system Autodesk Simulation Mechanical (R) by the Finite Element Method (FEM) gives correct results and can be successfully used in designing and optimisation of upholstered furniture constructions.