Cyclic Void Growth Model to Assess Ductile Fracture Initiation in Structural Steels due to Ultra Low Cycle Fatigue
Publication: Journal of Engineering Mechanics
Volume 133, Issue 6
Abstract
A new model is proposed to simulate ductile fracture initiation due to large amplitude cyclic straining in structural steels, which is often the governing limit state in steel structures subjected to earthquakes. Termed the cyclic void growth model (CVGM), the proposed technique is an extension to previously published models that simulate ductile fracture caused by void growth and coalescence under monotonic loading. The CVGM aims to capture ultra low cycle fatigue (ductile fracture) behavior, which is characterized by a few (generally, less than 20) reverse loading cycles to large inelastic strain amplitudes (several times the yield strain). The underlying mechanisms of low-cycle fracture involve cyclic void growth, collapse, and distortion, which are distinct from those associated with more conventional fatigue. The CVGM represents these underlying fracture mechanisms through plastic strain and stress triaxiality histories that can be modeled at the material continuum level by finite-element analyses. Development and validation of the CVGM is substantiated by about 100 notched bar tests, with accompanying finite-element analyses, metallurgical tests, and fractographic examinations of seven varieties of structural steels.
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Acknowledgments
This paper is based upon research supported by the National Science Foundation under the United States and Japan Cooperative Research for Urban Earthquake Disaster Mitigation Initiative (Grant No. CMS 9988902). Advice provided by Robert Dodds (University of Illinois) and Reiner Dauskardt (Stanford University) are gratefully acknowledged. Additional support was provided by the Steel Structures Development Center of the Nippon Steel Corporation (Futtsu, Japan), which provided steel materials, machining services, and fracture data, and by donations of steel material from the Garry Steel Company (Oakland, Calif.), and the ATLSS Engineering Research Center (Bethlehem, Pa.). Computational simulations and input from Ben Fell (University of California at Davis) is greatly appreciated.
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Information & Authors
Information
Published In
Journal of Engineering Mechanics
Volume 133 • Issue 6 • June 2007
Pages: 701 - 712
Copyright
© 2007 ASCE.
History
Received: May 25, 2006
Accepted: Dec 14, 2006
Published online: Jun 1, 2007
Published in print: Jun 2007
Notes
Note. Associate Editor: Christian Hellmich
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