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Depth-Sensing Indentation as a Micro- and Nanomechanical Approach to Characterisation of Mechanical Properties of Soft, Biological, and Biomimetic Materials

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School of Engineering, Cardiff University, Cardiff CF24 3AA, UK
2
College of Aerospace Engineering, Chongqing University, Chongqing 400044, China
3
Department of Functional Morphology and Biomechanics, Zoological Institute of the University of Kiel, Kiel 24118, Germany
*
Authors to whom correspondence should be addressed.
Nanomaterials 2020, 10(1), 15; https://doi.org/10.3390/nano10010015
Received: 20 November 2019 / Revised: 13 December 2019 / Accepted: 14 December 2019 / Published: 19 December 2019
(This article belongs to the Special Issue Soft, Biological and Composite Nanomaterials)
Classical methods of material testing become extremely complicated or impossible at micro-/nanoscale. At the same time, depth-sensing indentation (DSI) can be applied without much change at various length scales. However, interpretation of the DSI data needs to be done carefully, as length-scale dependent effects, such as adhesion, should be taken into account. This review paper is focused on different DSI approaches and factors that can lead to erroneous results, if conventional DSI methods are used for micro-/nanomechanical testing, or testing soft materials. We also review our recent advances in the development of a method that intrinsically takes adhesion effects in DSI into account: the Borodich–Galanov (BG) method, and its extended variant (eBG). The BG/eBG methods can be considered a framework made of the experimental part (DSI by means of spherical indenters), and the data processing part (data fitting based on the mathematical model of the experiment), with such distinctive features as intrinsic model-based account of adhesion, the ability to simultaneously estimate elastic and adhesive properties of materials, and non-destructive nature. View Full-Text
Keywords: characterization of materials; depth-sensing indentation; adhesion; the BG method; non-destructive testing characterization of materials; depth-sensing indentation; adhesion; the BG method; non-destructive testing
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Perepelkin, N.V.; Borodich, F.M.; Kovalev, A.E.; Gorb, S.N. Depth-Sensing Indentation as a Micro- and Nanomechanical Approach to Characterisation of Mechanical Properties of Soft, Biological, and Biomimetic Materials. Nanomaterials 2020, 10, 15.

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