Análise do comportamento mecânico das argamassas de assentamento através do método dos elementos discretos formado por barras

Abstract

Simulating the fracture of materials through numerical methods is becoming increasingly common, but there is still no method with one hundred percent accuracy when comparing with practical results. This paper consists of using the discrete element method (DEM) to simulate the failure of mortar specimens subjected to axial compression. The DEM involves simulating the failure of materials through the continuum, which is represented by a spatial arrangement of bars with mass centered at their ends. The specimens will be subjected to compressive stresses, where the specimen body is composed of the mesh formed by the DEM and the mesh of the presses that perform the compressive stress is formed by the finite element method (FEM). In the contact area between the specimens and the presses two different contact laws will be used, where the rough contact law represents a grease between the specimen face and the press and the frictionless contact law represents zero friction between the specimen face and the press. After simulating the specimens with the different contact laws will be compared the results of modulus of elasticity, stress x strain graph, Poisson's coefficient, tensile strength and rupture of the specimens, for two different specimen heights, with heights of 33 mm and 100 mm, two which the will be compared with the practical results obtained in the course completion work (TCC) of Staler, 2019. The contact law that best represented the numerical results along with DEM and Stalter, 2019 was the frictionless contact law. Rough only expressed unsatisfactory results in the parameters of shear stresses and Poisson's coefficient.