Prediction of fatigue life in multibody systems considering the increase of dynamic loads due to wear in clearances

Abstract The evolution of clearances in the joints of mechanisms due to the effect of wear has been already extensively addressed. This work goes a step beyond and studies the impact of clearance increase in the fatigue life of the machine. Moreover, a simplified method based on popular commercial software is proposed to analyze the effect of clearance evolution on the service life of machines, that requires a low effort from the user, thus being a suitable tool for industry. The method is first validated against an example from the literature and, then, it is applied to a real industrial machine. Results show that clearances may have a great impact in the service life of machines and, hence, they must be taken into account when seeking to make predictions at the design stage.

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