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Updated: Jun 9, 2025

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Controlling strain localization in thin films with nanoindenter tip sharpness.

Stanislav Zak1

  • 1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, 8700, Leoben, Austria. stanislav.zak@oeaw.ac.at.

Scientific Reports
|October 27, 2024
PubMed
Summary
This summary is machine-generated.

The tip radius significantly impacts thin film mechanical property measurements. Understanding this parameter is crucial for accurate elastic modulus determination in nanoindentation experiments.

Keywords:
Finite element modellingNanoindentationStrain localizationThin filmThin multilayer

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Area of Science:

  • Materials Science
  • Mechanical Engineering
  • Nanotechnology

Background:

  • Thin film mechanical property measurement is vital for diverse applications.
  • Substrate influence complicates accurate elastic modulus determination.
  • Existing methods lack comprehensive analysis of influencing parameters.

Purpose of the Study:

  • To quantify the effect of tip radius on strain fields during nanoindentation.
  • To investigate parameters enhancing thin film mechanical property measurement accuracy.
  • To highlight the importance of tip radius in nanoindentation analysis.

Main Methods:

  • Utilized three Berkovich indentation tips with varying radii.
  • Performed thin multilayer nanoindentation experiments.
  • Employed numerical modeling for simulation and analysis.

Main Results:

  • Confirmed a large elastically deformed zone with strain localization under the indenter.
  • Demonstrated a direct correlation between tip radius and strain localization.
  • Showcased how tip radius influences experimental outcomes.

Conclusions:

  • Tip radius is a critical parameter influencing strain localization in nanoindentation.
  • Accurate knowledge of tip radius is essential for reliable thin film elastic modulus measurement.
  • This study emphasizes the need to consider tip radius for improved nanoindentation insights.