Aplicação do método das diferenças finitas para a obtenção da deflexão de placas delgadas ortotrópicas bi-apoiadas

Abstract

In this work we present the numerical solution, by Finite Differences Method, of the fourth-order Partial Differential Equation that controls the bi-supported orthopropic thin plates’ deflection when subjected to an uniformly distributed load. This method transforms the partial differential equation into a system of linear equations. In order to obtain the solution of that system, the Gauss-Seidel iterative solution method was implemented. Finally, to facilitate the interpretation and reading of the results, a program compiled in MatLab R ’s language was developed, using its tool App Designer. The obtained results were compared with a commercial software, based on Finite Element Method. For comparison purposes, a geometric relations between length (L) and width (b) was used to compared both results, being L/b = 1 and L/b = 2, with error order of 0.59% and 0.84%, respectively. The relative error between the two results were relatively low.