Elasto-Plastic Indentation of a Layered Medium

[+] Author and Article Information
F. E. Kennedy, F. F. Ling

Rensselaer Polytechnic Institute, Troy, N. Y.

J. Eng. Mater. Technol 96(2), 97-103 (Apr 01, 1974) (7 pages) doi:10.1115/1.3443202 History: Received May 10, 1973; Revised July 24, 1973; Online August 17, 2010


An analysis is performed, using the finite element method, of the indentation of a thin elasto-plastic layer resting on or attached to a substrate of a different material, which may also deform plastically. The indentation size, contact pressure, applied load, and amount of plastic deformation are found for the elasto-plastic case, and the results are compared with those found by an elastic analysis. It is found that plastic deformation, which occurs in all indentation tests, has a considerable effect on the results, and that the deformation in the indented layer is also affected by such variables as: the material properties of both layer and substrate, the thickness of the layer, and the condition of the interface between layer and substrate. The “piling-up” that has been observed experimentally in indentation tests is found to depend on the same variables and occurs especially when a thin layer is adhered to a more rigid substrate. The analysis is valid throughout the loading-unloading cycle.

Copyright © 1974 by ASME
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