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Analysis of nanoindentation of soft materials with an atomic force microscope

Notbohm, Jacob and Poon, Benny and Ravichandran, Guruswami (2012) Analysis of nanoindentation of soft materials with an atomic force microscope. Journal of Materials Research, 27 (1). pp. 229-237. ISSN 0884-2914. https://resolver.caltech.edu/CaltechAUTHORS:20120224-140640650

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Abstract

Nanoindentation is a popular experimental technique for characterization of the mechanical properties of soft and biological materials. With its force resolution of tens of pico-Newtons, the atomic force microscope (AFM) is well-suited for performing indentation experiments on soft materials. However, nonlinear contact and adhesion complicate such experiments. This paper critically examines the application of the Johnson-Kendall-Roberts (JKR) adhesion model to nanoindentation data collected with an AFM. The use of a nonlinear least-square error-fitting algorithm to calculate reduced modulus from the nanoindentation data using the JKR model is discussed. It is found that the JKR model fits the data during loading but does not fit the data during unloading. A fracture stability analysis shows that the JKR model does not fit the data collected during unloading because of the increased stability provided by the AFM cantilever.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1557/jmr.2011.252DOIUNSPECIFIED
http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8472884PublisherUNSPECIFIED
ORCID:
AuthorORCID
Ravichandran, Guruswami0000-0002-2912-0001
Additional Information:© 2011 Materials Research Society. Received 4 May 2011; accepted 2 August 2011. Published online by Cambridge University Press: 31 August 2011. This research was supported by the National Science Foundation (DMR no. 0520565) through the Center for Science and Engineering of Materials (CSEM) at the California Institute of Technology, and this support is gratefully acknowledged. J.N. is supported by the Department of Defense (DoD) through the National Defense Science & Engineering Graduate Fellowship (NDSEG) Program.
Group:GALCIT
Funders:
Funding AgencyGrant Number
NSF Center for Science and Engineering of Materials (CSEM)0520565
Department of Defense (DOD) National Defense Science & Engineering Graduate Fellowship (NDSEG) ProgramUNSPECIFIED
Issue or Number:1
Record Number:CaltechAUTHORS:20120224-140640650
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20120224-140640650
Official Citation:Analysis of nanoindentation of soft materials with an atomic force microscope preview Jacob Notbohm, Benny Poon and Guruswami Ravichandran Journal of Materials Research / Volume 27 / Issue 01, pp 229 - 237 Copyright © Materials Research Society 2011 Published online: 31 August 2011 DOI:10.1557/jmr.2011.252
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:29464
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:24 Feb 2012 22:40
Last Modified:09 Mar 2020 13:19

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