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Measuring the Young’s Relaxation Modulus of PDMS Using Stress Relaxation Nanoindentation

Published online by Cambridge University Press:  31 January 2011

Ping Du ,
Hongbing Lu  and
Xin Zhang
Ping Du
Affiliation:
pdu@bu.edu, Boston University, Mechanical Engineering, Boston, Massachusetts, United States
Hongbing Lu
Affiliation:
Hongbing.Lu@unt.edu, University of North Texas, Mechanical and Energy Engineering, Denton, Texas, United States
Xin Zhang
Affiliation:
xinz@bu.edu, Boston University, Mechanical Engineering, Boston, Massachusetts, United States
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Abstract

The Young’s relaxation modulus of Polydimethylsiloxane (PDMS) film specimens was measured by the nanoindenter with a flat punch indenter. In the stress relaxation test, the initial ramp part was carefully considered to develop an accurate viscoelastic contact model. This model was used to fit the load-time data from the experimental tests. The resulting relaxation function was expressed by a general Maxwell equation. In addition, a case study of PDMS micropillar bending tests was performed, and the viscoelastic constitutive law was applied to develop an analytical solution of the reaction force. The results show that the reaction force calculated from the corrected model is generally agreed well with the experimental data.

Keywords

polymerviscoelasticitynano-indentation
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1222: Symposium DD – Microelectromechanical Systems — Materials and Devices III , 2009 , 1222-DD02-03
Copyright
Copyright © Materials Research Society 2010

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