Simulação computacional em camisas de motor construídas em liga de alumínio silício
Valter Barragan Neto
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia
DATA DE PUBLICAÇÃO
Automotive cylinder liners are mechanical components with the function of internal coating of the cylinder automotive engines. The liners have been made of cast iron, which meets the necessary requirements. The replacement of parts made of steel/ cast iron in aluminum alloys has been made with advantages not only in reducing weight as well as fuel consumption and emission of pollutants. This work has an objective to study the possibility to apply the cylinder liners built in aluminum and silicon alloy on engines with computer aided engineering help. The finite element method consists to generate a mathematical model with computational assistance, of geometry, representing several elements that have in common the node connection, forming the finite element, defined as a mesh. For each node the partial differential equations are solved by numerical methods. This study was aided by finite element software Hyperworks, where the mesh was generated and was exported to Abaqus where were performed the processing of input data. The starting point for the simulation of aluminum liners used in internal combustion engines was to define the format of the mesh for the engine block with less refinement, was chosen a mesh with tetrahedron elements of 4 nodes of with size ranging between 1 mm and 12 mm of edge element. The liners was designed with hexahedron elements of six nodes, which by definition are more consistent and have more accurate answers to the elements tetrahedrons and with a larger refinement, about 1 mm, both elements are first order elements with no nodes on edges midpoint . In function of the process of manufacturing the liners to be cast by centrifugation, layers of elements were created to meet the variation in the amount of the silicon liner, which in turn affects the physical properties of the liner along the thickness of the wall. With this model it was possible to show the viability of applying these liners in engine blocks of cast iron. The analysis has shown that a prototype could be build in order to test the cylinder liners application and also test the wear of the cylinder liner.
otto-cycle engine engine liner análise estrutural análise térmica camisa de motor motor a combustão interna motor ciclo otto engenharia de materiais e metalurgica structural analysis thermal analysis internal combustion engine
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