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Saxonian Institute of Surface Mechanics

O&PfC® for Creep, Visco-Elastic and Time-Dependent Material Behavior


When analysing instrumented indentation tests (e.g. nanoindentation, hardness test, etc.) on treated or coated surfaces with significant time-dependent material behavior (so-called creep: exponent often m>2 of the fit function), the time-dependent Young's modulus E(t) can now be calculated by our functional prototype O&PfC Light NG. This is not only important with respect to polymers, tissues, foams or similar materials, but also with respect to surfaces or coatings which are exposed to higher temperatures in service as they are closer to their melting point.

This functional prototype can compute the true time-dependent elastic modulus E(t) as well as dynamic properties like storage modulus E' and loss modulus E'' of the coating on the basis of the hold part of conventional load-depth curves. In addition, a new test procedure has been developed enabling a numerically more stable determination of the time-dependent elastic modulus as well as storage and loss modulus on the basis of several unloading curves with different strain rates. This approach assumes the whole sample as homogeneous half space for now. It will be extended to layered or graduated structures subsequently during the test period and provided to active prototype testers (minimum: one bug report) for free.

This special O&PfC Light NG prototype will be on sale at onetime 90% off while stocks last.

Effect of visco-elastic material behavior on indentation testing
Schemata of the effect of visco-elasticity (creep) of a plexiglass sample on instrumented indentation testing and evolution of stresses (von Mises comparison stress) in the material during holding part

Other Results

Of course, O&PfC NG can also calculate the following material properties which are known from our other products:

  • non-time-dependent real Young's modulus (elastic modulus) of each layer or substrate
  • yield strength of each layer or substrate
  • true hardness of the layer or the substrate
  • time-dependent elastic modulus of visco-elastic materials (e.g. foams, tissues, polymers)
  • dynamic parameters like storage modulus E' and loss modulus E''
Results of O&PfC Light NG
In addition to the regular results like coating hardness, O&PfC NG shows the dynamic results of the indentation analysis like time-dependent modulus of elasticity E(t), relaxation time τ, storage modulus E', and loss modulus E'' (highlighted by the red rectangle). The latters ones can also be plotted against angular velocity (lower diagram).

Information Material

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System Requirements

Minimum* Optimum
operating system: Microsoft Windows XP SP3
Microsoft Windows Vista
Microsoft Windows 8
Microsoft Windows 7
word size: 32 or 64 bit 32 or 64 bit
CPU: 2 cores
1 GHz
≥ 4 cores × 2 threads
≥ 2 GHz
RAM: 512 MB ≥ 4 GB
free HDD space: 24 MB (in system partition)
500 MB (for project files)
24 MB (in system partition)
≥ 3 GB (for project files)
screen: 1024 x 768 pixel
16 bit color depth
1920 x 1080 pixel
32 bit color depth
anti-virus software: Read information!
access rights for installation: administrator rights
access rights for use: user rights administrator rights
* If your computer meets only the minimum system requirements, the operation comfort (usability) and operating speed might be restricted.

Please ask us for more information!

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