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Saxonian Institute of Surface Mechanics

Reference scheme

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You need to do the following steps only to determine the real Young's modulus of a layer in any multi-layer coating by a common indentation measurement:

  1. Fitting an effective indenter to the unloading curve of an indentation measurement. Assuming a homogeneous half space preliminary, the classic Oliver and Pharr results can be used as starting parameters. figurative scheme ...
  2. The Young's modulus of the layer in question is fitted to the unloading part of the indentation curve, taking into account the effective indenter and the complete solution of the contact problem for layered materials (geometry of the system, parameters of additional layers etc.). As with all indentation based methods, an effective or contact modulus is obtained. Therefore, Poisson's ratio has to be estimated unless it is known in order to determine Young's modulus. figurative scheme ...
  3. This extended Oliver and Pharr method (Oliver&Pharr for Coatings) can determine the yield strength for many material configurations, too. In dependence on the experimental setup even other critical parameters (like critical tensile stress) can be obtained from the effective elastic field at the initiation of unloading. figurative scheme ...

Note that the approach outlined here, which is embodied in the module O&PfC® of our FilmDoctor® Studio, is a completely analytic methodology that is not based on a finite-element or another numerical approach. Therefore, this methodology gives a high accuracy and resolution which is determined solely by experimental factors.

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