Tip radius variation with elastic indentation depth

Journal Article · Wed May 16 00:00:00 UTC 2018 · Materials Letters

DOI: https://doi.org/10.1016/j.matlet.2018.05.045 · OSTI ID:1477973

Jankowski, Alan F. ^[1]; Ahmed, H. S. Tanvir ^[2]; Brannigan, Eric M. ^[3]

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1. Sandia National Lab. (SNL-CA), Livermore, CA (United States)
2. Intel Corporation, Portland, OR (United States)
3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

The reduced elastic modulus of a material is measured with a nanoindenter probe that is operated in the tapping mode. The resonant frequency of a freely oscillating cantilever is reduced when contact is made between the indenter tip and surface under investigation. It’s shown using elasticity theory that the elastic deformation is a function of the indenter tip radius. A deeper penetration within the elastic range can change the tip radius, and introduce an error of 10% in calculating the reduced elastic modulus.

• Research Organization: Sandia National Laboratories (SNL-CA), Livermore, CA (United States)
• Sponsoring Organization: USDOE National Nuclear Security Administration (NNSA)
• Grant/Contract Number: AC04-94AL85000; NA0003525
• OSTI ID: 1477973
• Report Number(s): SAND--2018-10179J; 667940
• Journal Information: Materials Letters, Journal Name: Materials Letters Vol. 227; ISSN 0167-577X
• Publisher: ElsevierCopyright Statement
• Country of Publication: United States
• Language: English