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Modified method for continuous stiffness measurement

Published online by Cambridge University Press:  31 January 2011

Pal Jen Wei  and
Jen Fin Lin
Pal Jen Wei
Affiliation:
Department of Mechanical Engineering, National Cheng Kung University, Tainan, Taiwan 701, Republic of China
Jen Fin Lin*
Affiliation:
Department of Mechanical Engineering, Center for Micro/Nano Science and Technology, and Institute of Nanotechnology and Microsystems Engineering, National Cheng Kung University, Tainan, Taiwan 701, Republic of China
*
a) Address all correspondence to this author. e-mail: jflin@mail.ncku.edu.tw
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Abstract

This study proposes a method developed to simultaneously solve contact hardness and reduced modulus by loading and unloading coefficients together with the inclined angle of an indenter. The ratios of the applied load to the squared slopes of load–depth curves during loading and unloading processes were used to determine loading and unloading coefficients. The values of the contact area estimated by the present method were found to be precise for a variety of materials. Compared to the reduced modulus, errors due to underestimated contact area were found more significant in the evaluation of contact hardness.

Keywords

HardnessNanoindentationPolymer
Type
Articles
Information
Journal of Materials Research , Volume 24 , Issue 3 , March 2009 , pp. 599 - 606
Copyright
Copyright © Materials Research Society 2009

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