Fast-to-Compute Weakly Coupled Ductile Fracture Model for Structural Steels
Publication: Journal of Structural Engineering
Volume 140, Issue 6
Abstract
Ductile fracture in metals can be simulated either by coupled or by uncoupled fracture models. Although the coupled models simulate the gradual loss of strength resulting from the initiation of the damage attributable to microvoid nucleation, growth and coalescence, the uncoupled models can describe critical the conditions under which ductile fracture initiates. Even though the coupled models can completely characterize the ductile damage process, calibration of these models is difficult and their computational implementation is expensive when compared with the uncoupled fracture models. This study is concerned with development of a fracture model that can simulate the ductile fracture process in steels like coupled models with the computational efficiency of the uncoupled models. To this end, a weakly coupled fracture model that can efficiently simulate the ductile fracture process is introduced. The weakly coupled model is proposed based on a micromechanical void growth model and is calibrated using the experimental data from notched steel specimens. The weakly coupled fracture model is successfully used to simulate failure resulting from ductile fracture in specimens made up of different batches of ASTM A992 steels and in specimens made up of ASTM A572 steels.
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Acknowledgments
The presented work is supported in part by the US 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 6 • June 2014
Copyright
© 2014 American Society of Civil Engineers.
History
Received: Apr 1, 2013
Accepted: Dec 16, 2013
Published online: Feb 26, 2014
Published in print: Jun 1, 2014
Discussion open until: Jul 26, 2014
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