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Title: Tip radius variation with elastic indentation depth

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.
Authors:
 [1] ;  [2] ;  [3]
  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)
Publication Date:
Report Number(s):
SAND-2018-10179J
Journal ID: ISSN 0167-577X; 667940
Grant/Contract Number:
AC04-94AL85000
Type:
Accepted Manuscript
Journal Name:
Materials Letters
Additional Journal Information:
Journal Volume: 227; Journal ID: ISSN 0167-577X
Publisher:
Elsevier
Research Org:
Sandia National Lab. (SNL-CA), Livermore, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE
OSTI Identifier:
1477973

Jankowski, Alan F., Ahmed, H. S. Tanvir, and Brannigan, Eric M.. Tip radius variation with elastic indentation depth. United States: N. p., Web. doi:10.1016/j.matlet.2018.05.045.
Jankowski, Alan F., Ahmed, H. S. Tanvir, & Brannigan, Eric M.. Tip radius variation with elastic indentation depth. United States. doi:10.1016/j.matlet.2018.05.045.
Jankowski, Alan F., Ahmed, H. S. Tanvir, and Brannigan, Eric M.. 2018. "Tip radius variation with elastic indentation depth". United States. doi:10.1016/j.matlet.2018.05.045.
@article{osti_1477973,
title = {Tip radius variation with elastic indentation depth},
author = {Jankowski, Alan F. and Ahmed, H. S. Tanvir and Brannigan, Eric M.},
abstractNote = {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.},
doi = {10.1016/j.matlet.2018.05.045},
journal = {Materials Letters},
number = ,
volume = 227,
place = {United States},
year = {2018},
month = {5}
}