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Nonlinear indentation of fibers

Published online by Cambridge University Press:  15 December 2011

Quinn P. McAllister
Affiliation:
Center for Composite Materials, Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716
John W. Gillespie Jr.*
Affiliation:
Center for Composite Materials, Department of Materials Science and Engineering, University of Delaware, Newark, Delaware 19716
Mark R. VanLandingham
Affiliation:
Weapons and Materials Research Directorate—Materials and Manufacturing Sciences Division, U.S. Army Research Laboratory, ATTN: RDRL-WMM-B, Aberdeen Proving Ground, Maryland 21005-5069
*
a)Address all correspondence to this author. e-mail: gillespi@udel.edu
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Abstract

An instrumented indentation method is established to accurately measure the local elastic-plastic material properties of a single fiber by accounting for the additional sources of compliance associated with fiber indentation. The Oliver-Pharr instrumented indentation data analysis method is compared for indentation of a standard, planar fused silica sample and in the radial direction of homogeneous, isotropic E-glass fibers of two different diameters. Compliance contributions from substrate deflection and other nonindentation-related fiber deflections are quantified and shown to be negligible. The added compliance observed is attributed to the lack of constraint due to the finite geometry of a curved fiber surface. This compliance contribution is accounted for by using a proposed area correction to capture the geometry of the curved fiber-probe contact combined with a structural compliance correction. Implementation of these corrections to experimental indentation curves results in accurate measurements of the fiber elastic modulus and hardness.

Type
Articles
Copyright
Copyright © Materials Research Society 2011

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References

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