On thresholds in the indentation size effect of polymers

Ashley N. Bucsek; Farid Alisafaei; Chung Souk Han; Nishant Lakhera

doi:10.1007/s00289-015-1517-y

On thresholds in the indentation size effect of polymers

Ashley N. Bucsek, Farid Alisafaei, Chung Souk Han, Nishant Lakhera

Aerospace Engineering and Mechanics

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Length scale-dependent deformation in polymers has been observed by various research groups in the last years. Here, the indentation size effect of polymers is studied where the hardness increases with decreasing indentation depth. As a model polymer, polydimethylsiloxane (PDMS) of two different cross-link densities is studied as it has been found in previous studies to exhibit very strong indentation size effects. It is found that there is an upper threshold in the indentation depth range of 17.9 and 41.6 μm, respectively, below which the indentation size effect can be observed and above which the hardness does not change with the indentation depth. Similar phenomena can be determined for other polymers, however, at much smaller length scales.

Original language	English (US)
Pages (from-to)	763-772
Number of pages	10
Journal	Polymer Bulletin
Volume	73
Issue number	3
DOIs	https://doi.org/10.1007/s00289-015-1517-y
State	Published - Mar 1 2016

Bibliographical note

Funding Information:
The support of this work through the National Science Foundation, Grants CMMI 1102764 and CMMI 1126860, is highly appreciated. ANB acknowledges her support by research fellowships of Wyoming EPSCoR.

Publisher Copyright:
© 2015, Springer-Verlag Berlin Heidelberg.

Keywords

Hardness
Indentation
Length scale-dependent deformation
Polymers

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10.1007/s00289-015-1517-y

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title = "On thresholds in the indentation size effect of polymers",

abstract = "Length scale-dependent deformation in polymers has been observed by various research groups in the last years. Here, the indentation size effect of polymers is studied where the hardness increases with decreasing indentation depth. As a model polymer, polydimethylsiloxane (PDMS) of two different cross-link densities is studied as it has been found in previous studies to exhibit very strong indentation size effects. It is found that there is an upper threshold in the indentation depth range of 17.9 and 41.6 μm, respectively, below which the indentation size effect can be observed and above which the hardness does not change with the indentation depth. Similar phenomena can be determined for other polymers, however, at much smaller length scales.",

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note = "Funding Information: The support of this work through the National Science Foundation, Grants CMMI 1102764 and CMMI 1126860, is highly appreciated. ANB acknowledges her support by research fellowships of Wyoming EPSCoR. Publisher Copyright: {\textcopyright} 2015, Springer-Verlag Berlin Heidelberg.",

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AU - Bucsek, Ashley N.

AU - Alisafaei, Farid

AU - Han, Chung Souk

AU - Lakhera, Nishant

N1 - Funding Information: The support of this work through the National Science Foundation, Grants CMMI 1102764 and CMMI 1126860, is highly appreciated. ANB acknowledges her support by research fellowships of Wyoming EPSCoR. Publisher Copyright: © 2015, Springer-Verlag Berlin Heidelberg.

PY - 2016/3/1

Y1 - 2016/3/1

N2 - Length scale-dependent deformation in polymers has been observed by various research groups in the last years. Here, the indentation size effect of polymers is studied where the hardness increases with decreasing indentation depth. As a model polymer, polydimethylsiloxane (PDMS) of two different cross-link densities is studied as it has been found in previous studies to exhibit very strong indentation size effects. It is found that there is an upper threshold in the indentation depth range of 17.9 and 41.6 μm, respectively, below which the indentation size effect can be observed and above which the hardness does not change with the indentation depth. Similar phenomena can be determined for other polymers, however, at much smaller length scales.

AB - Length scale-dependent deformation in polymers has been observed by various research groups in the last years. Here, the indentation size effect of polymers is studied where the hardness increases with decreasing indentation depth. As a model polymer, polydimethylsiloxane (PDMS) of two different cross-link densities is studied as it has been found in previous studies to exhibit very strong indentation size effects. It is found that there is an upper threshold in the indentation depth range of 17.9 and 41.6 μm, respectively, below which the indentation size effect can be observed and above which the hardness does not change with the indentation depth. Similar phenomena can be determined for other polymers, however, at much smaller length scales.

KW - Hardness

KW - Indentation

KW - Length scale-dependent deformation

KW - Polymers

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On thresholds in the indentation size effect of polymers

Abstract

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