Indenter tip dependence in the determination of elastic modulus in polymers

Seyed Hamid Reza Sanei, F. Alisafaei, Chung Souk Han

Research output: Chapter in Book/Report/Conference proceedingConference contribution

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.

Original languageEnglish (US)
Title of host publicationMicro- and Nano-Systems Engineering and Packaging
PublisherAmerican Society of Mechanical Engineers (ASME)
ISBN (Print)9780791856390
DOIs
StatePublished - Jan 1 2013
EventASME 2013 International Mechanical Engineering Congress and Exposition, IMECE 2013 - San Diego, CA, United States
Duration: Nov 15 2013Nov 21 2013

Publication series

NameASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE)
Volume10

Other

OtherASME 2013 International Mechanical Engineering Congress and Exposition, IMECE 2013
CountryUnited States
CitySan Diego, CA
Period11/15/1311/21/13

All Science Journal Classification (ASJC) codes

  • Mechanical Engineering

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  • Cite this

    Sanei, S. H. R., Alisafaei, F., & Han, C. S. (2013). Indenter tip dependence in the determination of elastic modulus in polymers. In Micro- and Nano-Systems Engineering and Packaging (ASME International Mechanical Engineering Congress and Exposition, Proceedings (IMECE); Vol. 10). American Society of Mechanical Engineers (ASME). https://doi.org/10.1115/IMECE2013-64831