Engine Oil- Crankshaft Interaction Fem Modelling of an Air-Cooled Diesel Engine under Dynamic Severe Functioning Conditions
O. Keita
Département of Hydrologie, Université de N’Zérékoré, BP 50, N’Zérékoré, Guinée.
Y. Camara *
Département of Energétique, Institut Supérieur de Technologie de Mamou, BP 63, Mamou, Guinée.
J. Bessrour
Université de Toulouse, CNRS, Mines Albi, INSA, UPS, ISAE-SUPAERO, ICA (Institut Clément Ader), Campus Jarlard, F-81013 Albi, France.
V. Velay
Laboratoire de mécanique Appliquée et ingenierie, Ecole Nationale d'Ingénieurs de Tunis, BP 37 Le Bélvédère, Tunis 1002, Tunisie.
F. Rézai-Aria
Laboratoire de mécanique Appliquée et ingenierie, Ecole Nationale d'Ingénieurs de Tunis, BP 37 Le Bélvédère, Tunis 1002, Tunisie.
*Author to whom correspondence should be addressed.
Abstract
Taking into account the interaction between the engine oil and the crankshaft to model crankshaft thermomechanical behavior under dynamic loading is very important. In particular, when the crankshaft is working in severe conditions. This paper deal with an air cooled direct injection-type engine crankshaft thermomechanical FEM modelling account for engine oil-cranks half interaction in severe working conditions. As case of application we consider the diesel engine Deutz F8L413. The model takes into account 2 forced convectives heat flux: engine oil and crankcase air. The severe mechanical and thermal characteristics of engine are experimentally measured on a bench test equipped with a hydraulic brake. The temperature distribution inside the crankshaft was computed using the measured temperature as boundary conditions. The most thermo-mechanical stressed zones of the crankshaft have been determined. The fatigue resistance of the crankshaft under thermo-mechanical conditions was examined using Dang-Van multi-axial fatigue criteria. To prove our model efficiency, we have compared crankshaft damage in service to the numerical simulation results. It was found the breakage occurred in an area where the numerical simulations give the highest stresses.
Keywords: Crankshaft, thermo-mechanic, dynamic behavior, fatigue resistance, severe working, interaction.