Large displacement micro-indentation tests have been performed on various polymeric solids to measure the plastic properties. Cylindrical flat-ended indenters with diameter in the range of are mostly used. The mechanism of large-strain indentation has been examined with optical microscopy and finite element simulations. Results show that under a flat-tipped indenter, the material can quickly reach a fully plastic state. The size (diameter) of the plastic zone is constant in large-strain regions and unaffected by the exact tip profile (flat, spherical, and conical). The indentation stress-displacement curve at large strains is linear as a result of the steady-state plastic flow, from which the mean indentation pressure, a measure of yield strength, can be readily extrapolated. The indentation stress-displacement response is independent of the indenter diameters but strongly dependent on the strain-hardening behavior of the material and the friction between a material and an indenter. Compared with other shaped indenters, the flat-ended indenter requires the least penetration depth in order to probe the plastic properties of a material or structure.
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e-mail: chlu@engr.uky.edu
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October 2008
Research Papers
Characterization and Modeling of Large Displacement Micro-/Nano-Indentation of Polymeric Solids
Y. C. Lu,
Y. C. Lu
Department of Mechanical Engineering,
e-mail: chlu@engr.uky.edu
University of Kentucky
, Paducah, KY 42002
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D. M. Shinozaki
D. M. Shinozaki
Department of Mechanical and Materials Engineering,
The University of Western Ontario
, London, ON, N6A 5B9, Canada
Search for other works by this author on:
Y. C. Lu
Department of Mechanical Engineering,
University of Kentucky
, Paducah, KY 42002e-mail: chlu@engr.uky.edu
D. M. Shinozaki
Department of Mechanical and Materials Engineering,
The University of Western Ontario
, London, ON, N6A 5B9, CanadaJ. Eng. Mater. Technol. Oct 2008, 130(4): 041001 (7 pages)
Published Online: August 26, 2008
Article history
Received:
July 13, 2007
Revised:
December 18, 2007
Published:
August 26, 2008
Citation
Lu, Y. C., and Shinozaki, D. M. (August 26, 2008). "Characterization and Modeling of Large Displacement Micro-/Nano-Indentation of Polymeric Solids." ASME. J. Eng. Mater. Technol. October 2008; 130(4): 041001. https://doi.org/10.1115/1.2969250
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