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Grooves in scratch testing

Published online by Cambridge University Press:  31 January 2011

Witold Brostow,
Wunpen Chonkaew,
Lev Rapoport,
Yakov Soifer,
Armen Verdyan and
Yakov Soifer
Witold Brostow*
Affiliation:
Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering, College of Engineering, University of North Texas, Denton, Texas 76203-5310
Wunpen Chonkaew
Affiliation:
Laboratory of Advanced Polymers & Optimized Materials (LAPOM), Department of Materials Science and Engineering, College of Engineering, University of North Texas, Denton, Texas 76203-5310
Lev Rapoport
Affiliation:
Department of Sciences, Holon Institute of Technology, 58102 Holon, Israel
Yakov Soifer
Affiliation:
Department of Sciences, Holon Institute of Technology, 58102 Holon, Israel
Armen Verdyan
Affiliation:
Department of Sciences, Holon Institute of Technology, 58102 Holon, Israel
Yakov Soifer
Affiliation:
Department of Sciences, Holon Institute of Technology, 58102 Holon, Israel; and Department of Physical Electronics, Faculty of Engineering, Tel Aviv University, 69978 Tel Aviv, Israel
*
a)Address all correspondence to this author.e-mail: brostow@unt.edu
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Abstract

For a number of polymers with a variety of chemical structures and different properties, we have performed scratch-resistance tests and investigated the profiles of the grooves formed using a profilometer. Three main kinds of material response are seen: plowing; cutting; and densification. The cross-sectional areas of the grooves include the groove and side top-ridge areas. The latter are smaller than the former, an indication of densification at the bottom and the sides of the groove; the effect can be connected to molecular dynamics simulations of scratch testing. The sum of the groove and top-ridge areas is the highest for Teflon, thus providing another measure of its poor scratch resistance. The Vickers hardness of the polymers was also determined. An approximate relationship exists between the hardness and the groove area. An unequivocal relationship between the hardness and the total cross-sectional area of the material displaced by the indenter is found. The resulting curve can be represented by an exponential decay function.

Keywords

DensificationHardnessTribology

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Type
Articles
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Journal of Materials Research , Volume 22 , Issue 9 , September 2007, pp. 2483 - 2487
Copyright
Copyright © Materials Research Society 2007

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References

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