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The application of contact mechanics...

Feng, Gang.

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The application of contact mechanics in the study of nanoindentation.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	The application of contact mechanics in the study of nanoindentation./
作者:	Feng, Gang.
面頁冊數:	114 p.
附註:	Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6210.
Contained By:	Dissertation Abstracts International66-11B.
標題:	Engineering, Materials Science. -
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3197428
ISBN:	0542431254

The application of contact mechanics in the study of nanoindentation.
Feng, Gang.

The application of contact mechanics in the study of nanoindentation. - 114 p.

Source: Dissertation Abstracts International, Volume: 66-11, Section: B, page: 6210.

Thesis (Ph.D.)--Stanford University, 2006.

Nanoindentation can be used to measure hardness ( H) and modulus (E) of materials at the nanometer scale. The indentation stress fields are important to understand characteristics of the indentation process, which is generally elastoplastic; the plastic deformation zone makes the problem very complex. In this dissertation, based on Johnson's expanding cavity model (K. L. Johnson, Contact mechanics, 1987, Cambridge University Press.) and Yoffe's surface inclusion model (E. H. Yoffe, Philosophical Magazine A, 1982, 46, 617-628.), we present a model that we call the Embedded-Center-of-Dilatation (ECD) model, matching with FEM results nearly perfectly up to the edge of the plastic zone.

ISBN: 0542431254Subjects--Topical Terms:

1017759
Engineering, Materials Science.

The application of contact mechanics in the study of nanoindentation.
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502 $a Thesis (Ph.D.)--Stanford University, 2006.
520 $a Nanoindentation can be used to measure hardness ( H) and modulus (E) of materials at the nanometer scale. The indentation stress fields are important to understand characteristics of the indentation process, which is generally elastoplastic; the plastic deformation zone makes the problem very complex. In this dissertation, based on Johnson's expanding cavity model (K. L. Johnson, Contact mechanics, 1987, Cambridge University Press.) and Yoffe's surface inclusion model (E. H. Yoffe, Philosophical Magazine A, 1982, 46, 617-628.), we present a model that we call the Embedded-Center-of-Dilatation (ECD) model, matching with FEM results nearly perfectly up to the edge of the plastic zone.
520 $a According to conventional plasticity theory, H is expected to be independent of indentation depth for a homogeneous material indented with a geometrically self-similar indenter, whereas numerous indentation studies have shown that H increases significantly for small indentations: this is called the indentation size effect (ISE). The model of Nix and Gao (NG) (W. D. Nix and H. J. Gao, J. Mech. Phys. Solids, 1998, 46, 411-425.) is one of the commonly cited treatments of this effect. We found that the NG model overestimates the hardness of MgO for indentation depths less than 200nm. The cause may be associated with a slight expansion of the plastic zone under the indentation, and a phenomenological model is presented to quantify the extent of the expansion of the plastic zone.
520 $a Nanoindentation may be used to test nanowires, which have attracted much interest due to their potential applications in small devices. A Nanoindenter XP was used to perform nanoindentations on GaN and ZnO nanowires. A two interface contact model has been developed for the nanoindentation of a nanowire on a flat substrate, with the two interfaces, indenter/nanowire and nanowire/substrate, being in series. The model has been used to analyze the nanoindentation data for GaN and ZnO nanowires. We found that the hardness of the GaN nanowire is 46.7+/-5.6GPa, which is much higher than that of the ZnO nanowire, 3.4+/-0.9GPa.
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