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Open AccessArticle

Multiscale Simulation of Surface Defects Influence Nanoindentation by a Quasi-Continuum Method

1
Department of Aeronautics and Astronautics, Fudan University, Shanghai 200433, China
2
Shanghai Institute of Measurement and Testing Technology, Shanghai 201203, China
*
Author to whom correspondence should be addressed.
Crystals 2018, 8(7), 291; https://doi.org/10.3390/cryst8070291
Received: 13 June 2018 / Revised: 11 July 2018 / Accepted: 12 July 2018 / Published: 14 July 2018
Microscopic properties of nanocrystal aluminum thin film have been investigated using the quasicontinuum method in order to study the influence of surface defects in nanoindentation. Various distances between the surface defect and indenter have been taken into account. The results show that as the distance between the pit and indenter increases, the nanohardness increases in a wave pattern associated with a cycle of three atoms, which is closely related to the crystal structure of periodic atoms arrangement on {1 1 1} atomic close-packed planes of face-centered cubic metal; when the adjacent distance between the pit and indenter is more than 16 atomic spacing, there is almost no effect on nanohardness. In addition, the theoretical formula for the necessary load for elastic-to-plastic transition of Al film has been modified with the initial surface defect size, which may contribute to the investigation of material property with surface defects. View Full-Text
Keywords: nanoindentation; quasicontinuum method; surface defect; multiscale simulation nanoindentation; quasicontinuum method; surface defect; multiscale simulation
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MDPI and ACS Style

Zhang, Z.; Ni, Y.; Zhang, J.; Wang, C.; Jiang, K.; Ren, X. Multiscale Simulation of Surface Defects Influence Nanoindentation by a Quasi-Continuum Method. Crystals 2018, 8, 291.

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