Abstract
The reliability of any mechanical system, in which the linear displacement of a piston is converted into the rotation of a power transmission shaft, strongly depends on the reliability of the crankshaft. The crankshaft is the critical component and any damage occurring to the crankshaft may put the mechanical system out of order. The numerical finite element simulation of crankshafts with multiple rods is often time consuming even if quite accurate if the aim is to evaluate the stress-strain behavior at the notched area and verify the component. The development of a simplified numerical model would prove effective to reduce the time needed to reach a good approximation design of the crankshaft. The aim of this paper is to give the designer a numerical procedure that allows to determine the strain and stress state and verify crankshafts having two or more rods.
Highlights
Notwithstanding the combustion engine is a consolidated mechanical system due to its continuous developments during the decades, its components are still subject of research in terms of strength to mass ratio enhancement, acoustic, dynamic and vibration behavior, stress and fatigue assessment
The crankshaft is put in series to all the other components of the engine in the fault crankshaft analysis and the reliability of the whole system heavily depends on the reliability of the crankshaft
The aim of this paper is to provide the machine designer with a numerical model that would prove to be much more effective than the simple approximate ones and at the same time would not be as time consuming and expensive as the numerical based ones, would allow to reach a good design level for the crankshaft
Summary
Notwithstanding the combustion engine is a consolidated mechanical system due to its continuous developments during the decades, its components are still subject of research in terms of strength to mass ratio enhancement, acoustic, dynamic and vibration behavior, stress and fatigue assessment. The aim of this paper is to provide the machine designer with a numerical model that would prove to be much more effective than the simple approximate ones and at the same time would not be as time consuming and expensive as the numerical based ones, would allow to reach a good design level for the crankshaft. Such a design level may be enough in many engineering applications in which the need is to evaluate the strain-stress state and verify the fatigue resistance of the component
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