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COBEM 2017
24th ABCM International Congress of Mechanical Engineering
NUMERICAL AND EXPERIMENTAL ANALYSIS OF A CRACKED SHAFT BASED ON STATIC AND DYNAMIC RESPONSES
Submission Author:
Izabela Batista da Silva , MG , Brazil
Co-Authors:
Tobias Morais, Aldemir Ap Cavalini Jr, Valder Steffen Jr, Izabela Batista da Silva
Presenter: Izabela Batista da Silva
doi://10.26678/ABCM.COBEM2017.COB17-2071
Abstract
Monitoring techniques devoted to rotating machinery are important tools used to provide safety operation conditions to these systems. Vibration based monitoring approaches are commonly used for crack detection in rotating shafts due to their ability to evaluate small changes in the physical parameters of the system. In this context, this paper aims at evaluating the effects of a transverse crack on a shaft-bearing test rig both from numerical and experimental results. The existence of a crack in the shaft introduces an additional flexibility, which is determined by using the strain energy density criterion and the linear fracture mechanics theory. This additional flexibility is taken into account from static and dynamic analyzes, in which a 2D finite element model of the shaft with an open crack is used. Additionally, a 3D non-linear model is formulated in the same conditions for comparison purposes. As a result, natural frequencies and strain measures of the healthy and cracked shaft are compared.
Keywords
rotating machines, monitoring technique, crack behavior, 2D and 3D finite element models
