Análise dos critérios de falha por intermédio do método dos elementos discretos formado por barras

Abstract

There are many criteria that aim to analyze the behavior of failure by fracture, both for brittle materials and for ductile materials. In brittle materials the failure is characterized by the sudden rupture of the element / structure, in ductile materials the failure starts in flow caused by the shear, in other words, initially occurs the significant deformation of the material so that after the structure will rupture.The objective of this present study is to analyze the failure criteria obtained with the method of discrete elements formed by bars (DEM). In this method, the solid is represented by a spatial arrangement of bars with the concentrated masses at their nodes,and has in its structure a set of twenty bars interconnected with each other which represent the portion of the continuum that is desired to be modeled.The DEM is constitute as a very effective tool in the analysis of processes of quasi-brittle materials fracture. Considering that the simulations conducted through this method provide similar results to those found experimentally or in the bibliography. In this study,was compared the failure surface obtained by the DEM, with the surfaces of failure of existing criteria . After this procedure it is possible to relate the parameters in study with the surface shape obtained and know the values that must be considered in these parameters in order to obtain a ductile material or a brittle material.