Nano-impact indentation for high strain rate testing: The influence of rebound impacts

Impact nanoindentation using a pendulum-based nanoindenter is an attractive technique for characterizing the high strain rate behavior of materials. However, pendulum-based systems typically allow the impacting indenter to strike multiple times as the pendulum rebounds and settles against the sample...

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Bibliographic Details
Published inExtreme Mechanics Letters Vol. 26; pp. 35 - 39
Main Authors Wheeler, J.M., Dean, J., Clyne, T.W.
Format Journal Article
LanguageEnglish
Published Elsevier Ltd 01.01.2019
Subjects
Dynamic hardness
High strain rate
Impact
Nanoindentation
Impact
Dynamic hardness
High strain rate
Nanoindentation
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Summary:Impact nanoindentation using a pendulum-based nanoindenter is an attractive technique for characterizing the high strain rate behavior of materials. However, pendulum-based systems typically allow the impacting indenter to strike multiple times as the pendulum rebounds and settles against the sample surface. This causes uncertainty as to whether the deformation is caused solely by the first impact or whether additional deformation occurs during the additional impacts. This work answers this question by using a modified system with a catching solenoid to prevent rebounding impacts. The difference in residual impressions made over a range of incident velocities between rebounding and single impacts is characterized using AFM. The rebounding impacts appear to be purely elastic and any additional deformation appears to be within the variability of the test.
ISSN:2352-4316
2352-4316
DOI:10.1016/j.eml.2018.11.005