Aplicação do método dos elementos finitos para análise da influência da geometria de furos em chapas sob carregamento alternado

Abstract

There are several applications of perforated plates in engineering and the study of the consequences caused by these discontinuities is of great value for structural improvement. The presence of perforations, in specific cases, improves the fatigue life of structures, by altering the distribution of internal stresses. This work initially sought to verify a computational model based on the Finite Element Method for application in fatigued perforated plates. Once the model's accuracy was verified, and a mesh convergence test was performed, it was used for the analysis of plates with holes of different geometries in order to correlate the hole shape with its influence on fatigue performance. It was observed that for perforations with the most elongated geometry, a better performance is obtained with a significant reduction in the mass of the plates. Also, when comparing holes with the same volume of material removed from each other, better performance is obtained using elliptical holes. For geometries where the dimension orthogonal to the direction of force remains fixed, slotted holes have superior fatigue performance. Keywords: Stress concentrators. Finite element method. Fatigue. Perforated plates.