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TECHNICAL PAPERS

A New Method Developed for Brittle and Ductile Materials to Evaluate Mechanical Properties of a Lump Specimen in the Use of Indentation Test

[+] Author and Article Information
Pal Jen Wei

Department of Mechanical Engineering, National Cheng Kung University, Tainan, 701 Taiwan

Jen Fin Lin1

Department of Mechanical Engineering, National Cheng Kung University, Tainan, 701 Taiwanjflin@mail.ncku.edu.tw

1

Corresponding author.

J. Eng. Mater. Technol 129(2), 284-292 (Nov 11, 2006) (9 pages) doi:10.1115/1.2712465 History: Received July 22, 2003; Revised November 11, 2006

In this study, the load-depth (Ph) relationships matching the experimental results of the nanoindentation tests exhibited at the subregions of small and large depths are obtained, respectively. The relationships associated with these two subregions are then linked by the hyperbolic logarithm function to attain a single expression that is applied in the evaluation of the specimen’s elastic recovery ability, as shown in the unloading process. A new method is developed in the present study to evaluate both Young’s modulus and the yield strength of either a ductile or brittle material through the uses of the appropriate Ph relationships developed in the load and unloading processes. The results of the Young’s modulus and the yield strength achieved by the present method are compared to those obtained from the conventional material tests for a lump material. The scattering of the experimental data shown in the loading and unloading processes are also interpreted by different causes.

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Copyright © 2007 by American Society of Mechanical Engineers
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Figures

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Figure 1

Load-depth profiles obtained from the indentation tests of quartz under different loads

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Figure 2

Experimental results of the loading and unloading processes regressed by different P‐h relationships at different indentation-depth subregions first and then linked by the hyperbolic logarithm function. The materials of specimens are (a) 6061 aluminum, (b) 304 stainless steel, (c) quartz, and (d) silicon (110).

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Figure 3

Schematic load-depth profiles are marked by the deformation style, the P‐h relationship and the indenter shape to describe the variations of the indentation behavior arising at (a) the brittle and (b) the ductile materials

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Figure 4

Variations of elastic recovery with the maximum indentation depths for two ductile materials and two brittle materials

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Figure 5

Probability density functions expressed as a function of the normalized error square for four kinds of materials

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