INTEC   05402
INSTITUTO DE DESARROLLO TECNOLOGICO PARA LA INDUSTRIA QUIMICA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Contact and Wear Prediction in Internal Combustion Engine Valves
Autor/es:
FEDERICO CAVALIERI; ALBERTO CARDONA
Lugar:
Graz
Reunión:
Conferencia; 8th European Solid Mechanics Conference; 2012
Resumen:
Engine manufacturers are facing increasing market demands for augmenting the durability and strength of their products, while at the same time lowering the gases emissions to the environment and the fuel consumption. These requirements pose severe exigences on internal combustion engine valves. Several mechanical components have extended its life by improving the alloys and/or the heat treatment or the hard facing of materials. Nevertheless, in a context of low oil content, wear between valve and seat is a phenomenon that engineers have to take more and more into account in new designs. The use of simulation tools for contact and wear prediction, specifically the finite element method (FEM), can help to design products for these stringent conditions.The general objective of this investigation is to understand the wear mechanism in a typical bimetallic pair valve-seat for combustion engine valves. The current model equations for wear are based on the pioneer works of Archard [1], who proposed that the volume removed by the wear effects is inversely proportional to the indenter hardness and directly proportional to: i) the normal load applied to the surface by its counterpart; ii) a dimensionless factor k, usually called wear coefficient, which indicates the severity of the wear processes; iii) the tangential relative displacement between bodies.