Knap, J. and Ortiz, M. (2003) Effect of Indenter-Radius Size on Au(001) Nanoindentation. Physical Review Letters, 90 (22). Art. No. 226102. ISSN 0031-9007. doi:10.1103/PhysRevLett.90.226102. https://resolver.caltech.edu/CaltechAUTHORS:20171128-115314976
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Abstract
We address the question of whether results obtained for small indenters scale to indenter sizes in the experimental range. The quasicontinuum method is used in order to extend the computational cell size to 2 × 2 × 1 μm^3, nominally containing of order 2.5 × 10^(11) atoms, and in order to permit consideration of indenter radii in the range 70−700 Å. The dislocation structures for the large indenter are found to be less sharp and to extend over a larger region than for the small indenter. In addition, the large-indenter force-displacement curve differs from that corresponding to the small indenter in one important respect, namely, the absence of force drops during indentation, despite profuse dislocation activity. Based on these observations, we conclude that the indenter force is not a reliable indicator of the onset of dislocation activity and plastic deformation for indenter sizes in the experimental range.
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| Additional Information: | © 2003 American Physical Society. (Received 3 November 2002; published 3 June 2003) Support from the DOE through Caltech’s ASCI/ASAP Center for the Simulation of the Dynamic Response of Solids is gratefully acknowledged. | |||||||||
| Group: | GALCIT | |||||||||
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| Issue or Number: | 22 | |||||||||
| DOI: | 10.1103/PhysRevLett.90.226102 | |||||||||
| Record Number: | CaltechAUTHORS:20171128-115314976 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20171128-115314976 | |||||||||
| Official Citation: | Effect of Indenter-Radius Size on Au(001) Nanoindentation J. Knap and M. Ortiz Phys. Rev. Lett. 90, 226102 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 83530 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Lydia Suarez | |||||||||
| Deposited On: | 28 Nov 2017 21:23 | |||||||||
| Last Modified: | 15 Nov 2021 20:12 |
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