Izvestiya of Saratov University.

Mathematics. Mechanics. Informatics

ISSN 1816-9791 (Print)
ISSN 2541-9005 (Online)

For citation:

Vatulyan A. O., Lyapin A. A., Kossovich E. L. Studying of Elastoplastic Properties of Coal Specimens Using Indentation Technique. Izvestiya of Saratov University. Mathematics. Mechanics. Informatics, 2018, vol. 18, iss. 4, pp. 412-420. DOI: 10.18500/1816-9791-2018-18-4-412-420, EDN: VQLCMW

This is an open access article distributed under the terms of Creative Commons Attribution 4.0 International License (CC-BY 4.0).
Published online: 
30.11.2018
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Language: 
English
Heading: 
Mechanics
Article type: 
Article
UDC: 
539.37
DOI: 
10.18500/1816-9791-2018-18-4-412-420
EDN: 
VQLCMW

Studying of Elastoplastic Properties of Coal Specimens Using Indentation Technique

Autors: 
Vatulyan Alexander Ovanesovitsch, Southern Federal University
Lyapin Alexander A., Southern Federal University
Kossovich Elena Leonidovna, Saratov State University
Abstract: 

A numerical study on elsatoplastic properties in problem of coals specimen nanoindentation by Berkovich pyramid is presented. The stress-strain state of specimen during indentation is calculated using finite element method including complex elastoplastic behaviour on the basis of Drucker-Prager model. The effective axisymmetrical indenter of cone shape is introduced and used for the simulation. The influence of basic geometrical and material parameters of the solid model on the indentation curve is studied. In addition, some new form of indentation curve approximation is proposed. For all the results calculated, the sets of approximation parameters are given. Using modern nanoindentation equipment the number of real experiments were performed and comparison with the mathematical model is presented.

Key words: 
coal
nanoindentation
material characterization
finite element method
elastoplastic
References: 
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Received: 
17.07.2018
Accepted: 
11.11.2018
Published: 
07.12.2018
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