Size effects on void growth in single crystals with distributed voids |
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Authors: | Ulrik Borg Christian F Niordson Jeffrey W Kysar |
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Institution: | 1. Department of Mechanical Engineering, Solid Mechanics, Technical University of Denmark, Kgs. Lyngby, DK-2800, Denmark;2. Department of Mechanical Engineering, Fu Foundation School of Engineering and Applied Science, Columbia University, 500 West 120th Street, New York, NY 10027, USA |
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Abstract: | The effect of void size on void growth in single crystals with uniformly distributed cylindrical voids is studied numerically using a finite deformation strain gradient crystal plasticity theory with an intrinsic length parameter. A plane strain cell model is analyzed for a single crystal with three in-plane slip systems. It is observed that small voids allow much larger overall stress levels than larger voids for all the stress triaxialities considered. The amount of void growth is found to be suppressed for smaller voids at low stress triaxialities. Significant differences are observed in the distribution of slips and on the shape of the deformed voids for different void sizes. Furthermore, the orientation of the crystalline lattice is found to have a pronounced effect on the results, especially for the smaller void sizes. |
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Keywords: | Void growth Strain gradient plasticity Single crystal Size effects |
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