Mechanical properties of materials in small-scale applications, such as thin coatings, are often different from those of bulk materials due to the difference in the manufacturing process. Indentation has been a convenient tool to study the mechanical properties in such applications. In this paper, a numerical technique is proposed that can identify the mechanical properties using optimization and evaluate the robustness of identified material properties using sensitivity analysis. First, two response surfaces are constructed for loading and unloading curves from the indentation experiment of a gold film on the silicon substrate. Unessential coefficients of the response surface are then removed based on the test statistics. Unlike the traditional methods of identification, the tip geometry of the indenter is included because its uncertainty significantly affects the results. In order to validate the accuracy and stability of the method, the sensitivity of the identified material properties with respect to each coefficient is analyzed. It turns out that the plastic hardening parameter is the most sensitive to the experimental data. In addition, all material parameters are sensitive to the coefficients of higher-order bases. However, their effects are diminished because the magnitudes of these coefficients are small.
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e-mail: ccdel@ufl.edu
e-mail: nkim@ufl.edu
e-mail: grb@ufl.edu
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July 2009
Research Papers
Material Property Identification and Sensitivity Analysis Using Micro-Indentation
Long Ge,
Long Ge
Department of Mechanical and Aerospace Engineering,
e-mail: ccdel@ufl.edu
University of Florida
, Gainesville, FL 32611
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Nam H. Kim,
Nam H. Kim
Associate Professor
Department of Mechanical and Aerospace Engineering,
e-mail: nkim@ufl.edu
University of Florida
, Gainesville, FL 32611
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Gerald R. Bourne,
Gerald R. Bourne
Research Faculty
Department of Mechanical and Aerospace Engineering,
e-mail: grb@ufl.edu
University of Florida
, Gainesville, FL 32611
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W. Gregory Sawyer
W. Gregory Sawyer
Professor
Department of Mechanical and Aerospace Engineering,
e-mail: wgsawyer@ufl.edu
University of Florida
, Gainesville, FL 32611
Search for other works by this author on:
Long Ge
Department of Mechanical and Aerospace Engineering,
University of Florida
, Gainesville, FL 32611e-mail: ccdel@ufl.edu
Nam H. Kim
Associate Professor
Department of Mechanical and Aerospace Engineering,
University of Florida
, Gainesville, FL 32611e-mail: nkim@ufl.edu
Gerald R. Bourne
Research Faculty
Department of Mechanical and Aerospace Engineering,
University of Florida
, Gainesville, FL 32611e-mail: grb@ufl.edu
W. Gregory Sawyer
Professor
Department of Mechanical and Aerospace Engineering,
University of Florida
, Gainesville, FL 32611e-mail: wgsawyer@ufl.edu
J. Tribol. Jul 2009, 131(3): 031402 (7 pages)
Published Online: June 1, 2009
Article history
Received:
August 13, 2008
Revised:
April 26, 2009
Published:
June 1, 2009
Citation
Ge, L., Kim, N. H., Bourne, G. R., and Sawyer, W. G. (June 1, 2009). "Material Property Identification and Sensitivity Analysis Using Micro-Indentation." ASME. J. Tribol. July 2009; 131(3): 031402. https://doi.org/10.1115/1.3142902
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