What is the 10% Rule in Nanoindentation? - Micro Material UK

The 10% rule in nanoindentation is a guideline used to minimize the influence of the substrate when measuring the mechanical properties of thin films or coatings. It states that:

The indentation depth should not exceed 10% of the film thickness to ensure that the measured hardness and elastic modulus primarily reflect the film's properties rather than those of the underlying substrate.

Why is the 10% Rule Important?

• Avoids Substrate Effect: If the indentation is too deep, the measured values will be influenced by the substrate, leading to inaccurate results.
• Ensures Reliable Data: By keeping the penetration depth shallow, the mechanical properties of the thin film or coating can be measured more accurately.
• Common Practice in Material Testing: Researchers and engineers use this rule when testing coatings on metals, ceramics, and polymers to get reliable mechanical property data.

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