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Dynamic nanoindentation testing: is there an influence on a material's hardness?
A Leitner1, V Maier-Kiener2, D Kiener1
1Department Materials Physics, Montanuniversität Leoben, Leoben, Austria.
Materials Research Letters
|November 10, 2017
Summary
Dynamic nanoindentation tests reveal significant hardness differences compared to static tests, even at large displacements. This is due to changing indentation strain-rates during the hold segment, impacting material hardness measurements.
Area of Science:
- Materials Science
- Mechanical Engineering
- Nanotechnology
Background:
- Modern nanoindentation devices enable dynamic testing, offering continuous mechanical property recording.
- Debates exist regarding the influence of superimposed forces in dynamic tests on material hardness.
Purpose of the Study:
- To investigate and quantify hardness differences between dynamic and static nanoindentation tests.
- To identify the underlying causes for observed hardness variations.
Main Methods:
- Performed dynamic and static nanoindentation tests across a broad range of materials.
- Analyzed mechanical properties and indentation strain-rates during tests.
Main Results:
- Significant hardness differences were observed between dynamic and static tests, even at large displacements.
- A changing indentation strain-rate during the hold segment of dynamic tests was identified as the primary cause.
Conclusions:
- Dynamic nanoindentation testing yields different hardness values than static tests.
- The indentation strain-rate variation during the hold segment must be considered for accurate and comparable nanoindentation hardness data.
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