Experimental Studies and Models for Ductile Fracture in ASTM A992 Steels at High Triaxiality
Publication: Journal of Structural Engineering
Volume 140, Issue 2
Abstract
This study presents the results of experimental investigation and models for ductile fracture in the ASTM A992 structural steels subjected to high stress triaxiality. To this end, uniaxial tension tests on the notched tensile specimens are conducted, and subsequent scanning electron microscopy (SEM) studies are performed on the fractured surfaces. From this SEM analysis, the fracture initiation mechanism in ASTM A992 steels is found to be the ductile fracture; however, the fracture propagation mode can be either ductile or cleavage fracture. Nonlinear finite-element analysis of the notched specimens is carried out to obtain the stress triaxiality distributions, and the location of the peak stress triaxiality is found to be strongly correlated to the location of the ductile fracture initiation zones. Finally, two uncoupled ductile fracture prediction models, the void growth model (VGM) and the stress modified critical strain model (SMCS), are calibrated, and the model parameters are provided for A992 steels.
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Acknowledgments
The presented work is supported in part by the U.S. National Science Foundation through grant CMS-0928547. Any opinions, findings, conclusions, and recommendations expressed in this paper are those of the authors and do not necessarily reflect the views of the sponsors.
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Published In
Journal of Structural Engineering
Volume 140 • Issue 2 • February 2014
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Jun 21, 2012
Accepted: Feb 15, 2013
Published online: Feb 18, 2013
Published in print: Feb 1, 2014
Discussion open until: Mar 1, 2014
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