Validation of Cyclic Void Growth Model for Fracture Initiation in Blunt Notch and Dogbone Steel Specimens
Publication: Journal of Structural Engineering
Volume 134, Issue 9
Abstract
Tests and finite-element analyses of blunt notch and dogbone specimens are presented to demonstrate the application and validation of the cyclic void growth model (CVGM) to evaluate the initiation of ductile fracture under cyclic loading in steel structures. Modeling concepts and procedures for characterizing the CVGM material parameters using notched bar tests are described. Accuracy of the model is validated through a series of cyclic tests of 14 blunt notch compact fracture specimens and four dogbone specimens. Four types of moderate to high strength structural steels are investigated (two types of A572-Grade 50, A514-Grade 110, HPS70W). The test specimens reflect stress and strain conditions encountered in structural steel components and provide sufficiently strong stress and strain gradients to validate the characteristic length assumptions in the model. Detailed finite-element analyses that employ the CVGM criterion are shown to predict fracture with good accuracy across the specimen geometries, steel types, and loading histories.
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Acknowledgments
This paper is based upon research supported by the National Science Foundation under the U.S. Japan Cooperative Research for Urban Earthquake Disaster Mitigation initiative (Grant No. NSFCMS 9988902). The advice and guidance 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 (UC Davis) is greatly appreciated.
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Information & Authors
Information
Published In
Journal of Structural Engineering
Volume 134 • Issue 9 • September 2008
Pages: 1528 - 1537
Copyright
© 2008 ASCE.
History
Received: Jul 13, 2007
Accepted: Mar 21, 2008
Published online: Sep 1, 2008
Published in print: Sep 2008
Notes
Note. Associate Editor: Sashi K. Kunnath
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