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The concept of differential hardness in depth sensing indentation

  • Since in-depth sensing indentation load–depth data of the entire loading–unloading cycle are available, more information than a single hardness value and an elastic modulus can be extracted from the experimental data. The conventional hardness H (h) = F (h)/Ac(h) and the differential hardness Hd(h)=dF/dAc are calculated as continuous functions of depth h and compared to each other in this paper (F: load, Ac: contact area). It turns out that Hd describes the momentary material resistance to deformation, whereas H integrates over deformation states from first tip–sample contact to current penetration h. This difference is particularly important for materials not homogeneous in depth (e.g. layer systems), and for situations where time-dependent external factors influence the momentary deformation resistance. Photoplasticity is considered as an example for the latter.

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Author:Bodo Wolf, Asta Richter
URN:urn:nbn:de:kobv:526-opus4-5657
DOI (Version of Record):https://doi.org/10.1088/1367-2630/5/1/315
ISSN:1367-2630
Parent Title (English):New Journal of Physics
Document Type:Article
Language:English
Year of Publication:2003
Date of first Publication:2003/03/04
Publishing Institution:Technische Hochschule Wildau
Release Date:2016/06/14
Volume:5
Issue:15
First Page:15.1
Last Page:15.17
Source:B Wolf and A Richter 2003 New J. Phys. 5 15
Faculties an central facilities:Fachbereich Ingenieurwesen / Wirtschaftsingenieurwesen (bis 8/2014)
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):Creative Commons - CC BY-NC-SA - Namensnennung - Nicht-kommerziell - Weitergabe unter gleichen Bedingungen 3.0 Deutschland
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