An explanation for the shape of nanoindentation unloading curves based on finite element simulation

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Current methods for measuring hardness and modulus from nanoindentation load-displacement data are based on Sneddon`s equations for the indentation of an elastic half-space by an axially symmetric rigid punch. Recent experiments have shown that nanoindentation unloading data are distinctly curved in a manner which is not consistent with either the flat punch or the conical indenter geometries frequently used in modeling, but are more closely approximated by a parabola of revolution. Finite element simulations for conical indentation of an elastic-plastic material are presented which corroborate the experimental observations, and from which a simple explanation for the shape of the unloading … continued below

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6 p.

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Bolshakov, A.; Pharr, G. M. & Oliver, W. C. April 1, 1995.

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This article is part of the collection entitled: Office of Scientific & Technical Information Technical Reports and was provided by the UNT Libraries Government Documents Department to the UNT Digital Library, a digital repository hosted by the UNT Libraries. It has been viewed 208 times, with 7 in the last month. More information about this article can be viewed below.

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Current methods for measuring hardness and modulus from nanoindentation load-displacement data are based on Sneddon`s equations for the indentation of an elastic half-space by an axially symmetric rigid punch. Recent experiments have shown that nanoindentation unloading data are distinctly curved in a manner which is not consistent with either the flat punch or the conical indenter geometries frequently used in modeling, but are more closely approximated by a parabola of revolution. Finite element simulations for conical indentation of an elastic-plastic material are presented which corroborate the experimental observations, and from which a simple explanation for the shape of the unloading curve is derived. The explanation is based on the concept of an effective indenter shape whose geometry is determined by the shape of the plastic hardness impression formed during indentation.

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6 p.

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INIS; OSTI as DE95008905

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  • Fall meeting of the Materials Research Society (MRS), Boston, MA (United States), 28 Nov - 9 Dec 1994

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  • Other: DE95008905
  • Report No.: CONF-941144--99
  • Grant Number: AC05-84OR21400;AC05-76OR00033
  • Office of Scientific & Technical Information Report Number: 35341
  • Archival Resource Key: ark:/67531/metadc683517

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  • April 1, 1995

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  • July 25, 2015, 2:20 a.m.

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  • July 30, 2020, 10:40 p.m.

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Bolshakov, A.; Pharr, G. M. & Oliver, W. C. An explanation for the shape of nanoindentation unloading curves based on finite element simulation, article, April 1, 1995; Tennessee. (https://digital.library.unt.edu/ark:/67531/metadc683517/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.

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