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Ingeniería Mecánica

On-line version ISSN 1815-5944

Abstract

GUERRA-FERNANDEZ, Yamira; ORDONEZ-HERNANDEZ, Urbano  and  GONZALEZ-FERNANDEZ, Vladimir. Failure analysis of polar shoes fixing bolts of a motogenerator. Ingeniería Mecánica [online]. 2019, vol.22, n.3, pp.156-160.  Epub Sep 24, 2019. ISSN 1815-5944.

In this work it was investigated the most probable causes of failure of a part of the fixing bolts of 5 of the 10 pole shoes of a generator belonging to a diesel-generator engine system of 2,5 Mw. The failure, due to its characteristics, caused the generator to be rendered useless. To investigate the most probable cause of the fault, some bolts were selected of those that could be recovered after the breakdown, and which were subjected to analysis, mechanical resistance tests and HRc hardness, metallographic analysis and an analysis of the characteristics of the fracture in the damaged bolts. Using the fracture mechanics, it was possible to conclude that the primary cause of the failure of the fixing bolts of five of the pole shoes of the generator, was probably due to the loss of the initial pretension of one or more of the bolts, to which also contributed to the existence of vibrations and electrodynamic forces that were always present and which finally caused the loosening of one or more of the bolts of five of the ten pole shoes.

Keywords : electro-energetic system; failure of bolts; pole shoes.

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