Applying the Cyclic Void Growth Model to Assess the Ultralow Cycle Fatigue Life of Steel Castings
Publication: Journal of Structural Engineering
Volume 144, Issue 8
Abstract
Steel castings have become an attractive option in the development of new seismic force-resisting systems because of their geometric freedom and ability to control material properties. Despite, in most past applications, being used as elements that remain elastic during seismic events, recent research has led to the development and validation of new systems that rely on their yielding response. As such, further study of their ultralow cycle fatigue (ULCF) life is essential to understanding their performance as yielding fuses. Fatigue laws are calibrated herein for multiple heats of cast steel using an existing law proposed for rolled steel. These laws are used to predict the ductile failure of steel castings in full-scale experiments. The concept of a characteristic cyclic coupon test to assess the castings’ ULCF life at the foundry is also discussed. It is found that the ULCF model provides good predictions of the onset of failure in full-scale steel castings. Finally, the initial investigation into relating the full-scale ULCF life to the steel microstructure and small-scale fatigue test results has shown promising results.
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Acknowledgments
The research presented in this paper complements previous research conducted by Dr. Michael Gray from Cast Connex in the field of steel castings. The advice provided by Dr. Michael Gray is very much appreciated. The assistance of the technical staff at the University of Toronto Structural Laboratories and Earth Sciences Centre is also acknowledged.
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Published In
Journal of Structural Engineering
Volume 144 • Issue 8 • August 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Apr 26, 2017
Accepted: Dec 13, 2017
Published online: Jun 15, 2018
Published in print: Aug 1, 2018
Discussion open until: Nov 15, 2018
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