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.
Highlights
The automotive crankshafts are working under severe thermo-mechanical conditions
In this paper we investigate the crankshaft thermomechanical modelling account for the engine oil crankshaft interaction effects in severe dynamic working conditions, which are deduced from experimental measurements on bench
The engine oilcrankshaft interaction under dynamic loading is studied on those different regimes numerically by the finite element method
Summary
The engine oil in forced convection with crankshaft air transports a significant heat flux to the crankshaft crankpin and crankshaft bearings. This interaction is very important and requires to be take into account to deal with the crankshaft thermo-mechanical problem under dynamic loading. This kind of study is seldom documented in the open literature. Crankshaft thermomechanical modelling account for the engine oilcrankshaft interaction in severe working conditions is seldom addressed, especially on engines with cylinders in V-type under maximum loading conditions (regime of maximum power and torque). The few thermomechanical models of crankshaft found in the literature seem more interested in the overall look of the set of crankcase-crankshaft thermal response
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