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Indenter Tip Dependence in the Determination of Elastic Modulus in Polymers

[+] Author Affiliations
Seyed Hamid Reza Sanei, F. Alisafaei, Chung-Souk Han

University of Wyoming, Laramie, WY

Paper No. IMECE2013-64831, pp. V010T11A079; 5 pages
doi:10.1115/IMECE2013-64831
From:
  • ASME 2013 International Mechanical Engineering Congress and Exposition
  • Volume 10: Micro- and Nano-Systems Engineering and Packaging
  • San Diego, California, USA, November 15–21, 2013
  • Conference Sponsors: ASME
  • ISBN: 978-0-7918-5639-0
  • Copyright © 2013 by ASME

abstract

The two most common outputs of nanoindentation experiment are hardness and elastic modulus. Length scale dependent deformation in polymers has however been observed in different experiments such as microbeam bending, torsional thin wires and indentation testing which may affect the mechanical testing. Unlike in metals where the size dependency is attributed to necessary geometry dislocations, the origin of length scale dependent deformation in polymers is not well understood. In this study, elastic modulus of polydimethylsiloxane (PDMS) is determined using both Berkovich and spherical tips. Observing different trends for elastic modulus upon the change of indentation depth using these two different tips brings up the question which tip should be used to get the real mechanical properties of PDMS which is discussed here. Surface roughness, surface effects and the imperfection of the Berkovich indenter tip are negligible at the studied length scale.

Copyright © 2013 by ASME

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