Navegando por Autor "Medeiros, Evando E."
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Artigo Experimental and numerical analysis of vickers hardness testing(International Journal of Research and Reviews in Applied Sciences, 2013-11) Medeiros, Evando E.; Dias, Avelino Manuel da SilvaIndentation Tests have been largely used for determination of superficial hardness. Due to its great applicability, new methodologies are being developed in order to determine mechanical properties such as Young Modulus (E) and fracture toughness (KIC) for brittle materials. However, the Vickers indentation has several limitations and complications as methodology for characterization of these material properties. Thus, the use of a numerical technique able to determine fields of stress and strain during the indentation cycle may give a more reliable interpretation of this kind of test. Hence, this work aims to study the mechanical behaviour of a specimen of tungsten carbide cobalt (WC-Co) during a Vickers indentation test, based on FE calculations with the commercial solver MSC Marc. In a future development of this work, it will be developed numerical models to simulate the mechanisms of crack onset and their propagation during the tests.Artigo Numerical simulation of mechanical fracture testings(International Journal Of Materials Engineering, 2012) Medeiros, Evando E.; Dias, Avelino Manuel da Silva; Christoforo, André LuisThis paper deals with the determination of stress intensity factors in a WC-6Co sample through the Finite Elements Method (FEM). A compact specimen configuration, used in fracture testings, was numerically modelled with the FEM commercial code MARCTM. First, in studying of this specimen was considered a bidimensional strain plane analysis. Several meshes were used in the tested models and then results were compared with the experimental data, that can be found on technical literature. Finally, a tridimensional compact specimen was also modelled and studied. With these results, we were able to understand better the triaxial stress behaviour in the central portion of the specimen. It’s hopeful this methodology will be applied in nonconventional fracture mechanics testings, such as a Vickers indentation technique