A mechanistic framework has been developed for interpreting scratch tests performed with spherical indenters on elastic∕plastic materials. The pertinent scaling relations have been identified through a plastic analysis and the model has been subsequently calibrated by finite element calculations. The results show that the ratio of scratch force to normal force (or apparent friction coefficient) can be partitioned into two additive components: one due to interfacial friction and another associated with plastic deformation. The plastic component scales parabolically with the normal force and depends only weakly on the true (elastic) friction coefficient. A simple formula for the scratch force, based on the plastic analysis and the numerical results, has been derived. Finally, experimental measurements on two material standards commonly used for nanoindenter calibration have been used to verify the theoretical results.
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November 2008
Research Papers
Scratching of Elastic∕Plastic Materials With Hard Spherical Indenters
Shane E. Flores,
Shane E. Flores
Materials Department,
University of California
, Santa Barbara, CA 93106
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Michael G. Pontin,
Michael G. Pontin
Materials Department,
University of California
, Santa Barbara, CA 93106
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Frank W. Zok
Frank W. Zok
Materials Department,
University of California
, Santa Barbara, CA 93106
Search for other works by this author on:
Shane E. Flores
Materials Department,
University of California
, Santa Barbara, CA 93106
Michael G. Pontin
Materials Department,
University of California
, Santa Barbara, CA 93106
Frank W. Zok
Materials Department,
University of California
, Santa Barbara, CA 93106J. Appl. Mech. Nov 2008, 75(6): 061021 (7 pages)
Published Online: August 22, 2008
Article history
Received:
January 22, 2008
Revised:
June 30, 2008
Published:
August 22, 2008
Citation
Flores, S. E., Pontin, M. G., and Zok, F. W. (August 22, 2008). "Scratching of Elastic∕Plastic Materials With Hard Spherical Indenters." ASME. J. Appl. Mech. November 2008; 75(6): 061021. https://doi.org/10.1115/1.2966268
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