engleski

Plywood stress optimisation using the finite element method

In this paper, relevant stress and strain components are investigated with the aim to optimise a construction of veneer plywood under a bending load. For this purpose a veneer beech plywood of 13 plies is laboratory-made and its bending properties are measured. The laboratory results are used as the basic values for creating 2D models, which are used then for optimisation and analyses using the finite element method, depending of the thickness variations of outer plies. The obtained results indicate different relations of stress and strain distribution due to different type of plywood structure constructions and its grain directions. When the veneer thickness of the outer plies is increased, the values of Von Mises stress decreases according to different relation forms. It has a second-order polynomial form when the grain direction is parallel, but it has a third-order polynomial form when the grain direction is perpendicular to the load direction. As a difference of stress relations where both relations have decreasing form, the values of equivalent strains has the opposite relation form. A strain relation form decreases only if the grain direction is parallel, but it increases if the grain direction is perpendicular to the load direction.

plywood; optimisation; stress; strain; finite element method

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