A Contribution to the Mechanical Characterization of Cu ETP Used in the Electric Motors Industry

• Type: Article in International Conference Proceedings Book
• Date: 2013

Authors

Moreira, PMGP (Author) FEUP; de Figueiredo, MAV (Author) FEUP; de Castro, PMST (Author) FEUP

Conference proceedings International

Title: ADVANCED MATERIALS FORUM VI, PTS 1 AND 2

Pages: 679-684

6th International Materials Symposium (MATERIALS 2011)/15th Meeting of SPM

Guimaraes, PORTUGAL, APR 18-20, 2011

Indexing

ISI Web of Knowledge - 0 Citations

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Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-005-3PN

DOI: 10.4028/www.scientific.net/msf.730-732.679

Abstract (EN): The analysis of Cu ETP of a component of electric motors manufactured by WEG is presented. The work included three main tasks: metallographic analyses at the micro and macro levels; mechanical testing; scanning electron microscopy observations. The objective was the evaluation of the state of bars material before and after service. It was found that material in both conditions presents similar microstructures. This indicates that, despite the rotor working at temperatures above 300 degrees C, no grain recrystallization can be identified. It was verified that the copper bar base material presents higher hardness values of than the copper ring. A decrease of yield and rupture stresses as the temperature increases was observed during tensile tests at different temperatures. During testing, a fatigue life of 10(7) cycles for a remote stress of approximately 134MPa is estimated. It can be concluded that the material after and before service presents different properties, the first one presenting lower strength. This behavior is reflected in lower hardness, yield and rupture stress of the material taken from the fractured rotor bars. This observation can be a result of the high temperature (above 300 degrees C) that is present in the rotor during each start.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6