Mechanical, structural and scaling properties of coals: depth sensing indentation studies

Kossovich, Elena L., Borodich, Feodor M. ORCID: https://orcid.org/0000-0002-7935-0956, Epshtein, Svetlana A., Galanov, Boris A., Minin, Maxim G. and Prosina, Vera A. 2019. Mechanical, structural and scaling properties of coals: depth sensing indentation studies. Applied Physics A: Materials Science and Processing 125 , -. 10.1007/s00339-018-2282-1

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Abstract

This paper discusses special features of mechanical behaviour of coals discovered using depth-sensing indentation (DSI) techniques along with other traditional methods of material testing. Many of the special features are caused by the presence of multiscale complex heterogeneous internal structures within the samples and brittleness of some coal components. Experimental methodology for studying mechanical properties of coals and other natural extreme materials like bones is discussed. It is argued that values of microhardness of bituminous coals correlate strongly with the maximum load; therefore, the use of this parameter in application to coals may be meaningless. For analysis of the force-displacement curves obtained by DSI, both Oliver–Pharr and Galanov–Dub approaches are employed. It is argued that during nanoindentation, the integrity of the internal structure of a coal sample within a small area of high stress field near the tip of indenter may be destroyed. Hence, the standard approaches to mechanical testing of coals should be re-examined

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Engineering
Publisher:	Springer Verlag (Germany)
ISSN:	0947-8396
Date of First Compliant Deposit:	22 February 2019
Date of Acceptance:	24 November 2018
Last Modified:	26 Nov 2024 08:00
URI:	https://orca.cardiff.ac.uk/id/eprint/119777

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