Analysis Of Contact Deformation Between
A Coated Flat Plate And A Sphere And
Its Practical Application
Author(s)
T. Motoda, M. Shima, T. Jibiki, S. Sasaki & K. Miyake
Abstract
Recently nano-indentation with a triangular pyramid indenter has been widely
used as a method of measuring Young’s modulus of materials as well as the
hardness. However, this method becomes difficult to measure Young’s modulus
of thin films less than 1 µm in thickness accurately since an indenter penetration
depth less than several tens nm is required avoiding the effect of the substrate. In
this study we attempt to measure Young’s modulus of coating film by the elastic
indentation of a spherical indenter into a coated flat. Young’s modulus of film
can be accurately measured without being affected by the substrate material if
the relation between the elastic normal approach and Young’s modulus of the
coating film can be obtained for a given thickness of the film and given
properties of substrate material. In order to attain the purpose an analytical
method, which takes the elastic deformation of the substrate into consideration,
is developed to calculate such the contact deformation, and the possibility of
applying the calculation to measurement of Young’s modulus of films is
examined.
Keywords: coating film, spherical indenter, Young’s modulus, Hertzian contact,
elastic indentation, new analytical method, nano-indentation.
1 Introduction
Young’s modulus of films coated on the surface of materials is an essential
physical parameter in analyses of the exfoliation of films or in analysis of the
elastohydrodynamic lubrication of coated machine parts. Recently, nano-
Keywords
coating film, spherical indenter, Young’s modulus, Hertzian contact,
elastic indentation, new analytical method, nano-indentation.
Related Book
Other papers in this volume
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