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Comparison of the Young's moduli of polymers measured from nanoindentation and bending experiments

Published online by Cambridge University Press:  21 July 2014

Ricardo Martinez  and
L. Roy Xu
Ricardo Martinez
Affiliation:
Department of Mechanical Engineering, University of Texas at El Paso, El Paso, Texas 79968
L. Roy Xu*
Affiliation:
Department of Mechanical and Aerospace Engineering, New Mexico State University, Las Cruses, New Mexico 88003
*
Address all correspondence to L. Roy Xu at [email protected]
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Abstract

Spherical and conical nanoindentation experiments were performed for the same polymer specimens to compare Young's moduli measured from the elastic loading and unloading curves, and bending experiments. Finite-element simulation was employed to ensure pure elastic deformation during spherical nanoindentation. The moduli measured from the elastic loading curves using Hertz's contact law are very close to the bending moduli, because both measurements were conducted under the same elastic deformation. However, the moduli measured from the elastic unloading curves are up to 60% higher than the bending moduli owing to plastic deformation close to the sharp conical indenter tip.

Type
Research Letters
Information
MRS Communications , Volume 4 , Issue 3 , September 2014 , pp. 89 - 93
Copyright
Copyright © Materials Research Society 2014 

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