Effect of Initial Void Shape on Void Growth of Structural Steels Based on Micromechanical RVE Models
Publication: Journal of Materials in Civil Engineering
Volume 34, Issue 4
Abstract
This paper aims to study the effect of initial void shape on void growth of structural steels, which is a critical stage for ductile fracture of steel. Typical void shapes of structural steels were characterized by an in situ high-resolution micro X-ray computed tomography (μXCT) technique, including spherical, elliptical, and cylindrical voids. Then, a micromechanical representative volume element (RVE) model containing a single void was established with periodic boundary conditions. On this basis, impacts of the void shape on void growth were analyzed through Python-based parametric modeling in ABAQUS with respect to the stress triaxiality, aspect ratio, orientation, and initial void volume fraction, respectively. The results indicate a significant effect of the void shape on void growth under low stress triaxialities, and the effect tends to decrease with the increase of the stress triaxiality. Under low stress triaxialities (e.g., 0.33), there is a remarkable void growth difference between cylindrical and elliptical voids with the same initial aspect ratio, and this difference tends to disappear when the stress triaxiality increases to a high value, e.g., 0.8. Compared with the void orientation aligned in a coordinate axis, the off-axis one presents a smaller void growth difference induced by the void shape when the stress triaxiality is low, but reverse under high stress triaxialities. Finally, accurate and simplified formulas were proposed to consider the effects of void shape on void growth at the mesoscale.
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Data Availability Statement
All data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The financial support from the National Natural Science Foundation of China (NSFC) with Grant No. 51820105013 is greatly acknowledged. This study was also supported by the Scientific Research Fund of Institute of Engineering Mechanics, China Earthquake Administration (Grant No. 2019 EEEVL0302).
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Published In
Journal of Materials in Civil Engineering
Volume 34 • Issue 4 • April 2022
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© 2022 American Society of Civil Engineers.
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Received: May 19, 2021
Accepted: Aug 13, 2021
Published online: Jan 19, 2022
Published in print: Apr 1, 2022
Discussion open until: Jun 19, 2022
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