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Proceedings Paper

Measurement of local values of strains of the briquette by means of special resistance strain gauges
Author(s): Jozef Rysz
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Paper Abstract

Local measurement of the coal briquette strains during its destruction caused by sudden decrease of pressure of gas filling pores is difficult, because of high strain of coal (exceeds 16%), which results in bursting. A special type of an resistance-strain gauge, which is pressed into a defined position during briquette preparation was elaborated. This gauge is deformed just as the surrounding coal. The strain is measured as a difference in resistance of a mixture of coal grains (briquette material) and short, 8 micrometers dia. graphite fibers. A ca. 0.5 mm thick and ca. 1 mm long gauge was prepared. Its initial resistance constituted several hundreds ohms. The resistance vs. strain dependence is not linear but stable enough in time and does not depend on the type of gas filling briquette pores (e.g. CO2 and He).

Paper Details

Date Published: 13 February 1997
PDF: 4 pages
Proc. SPIE 3054, Optoelectronic and Electronic Sensors II, (13 February 1997); doi: 10.1117/12.266695
Show Author Affiliations
Jozef Rysz, Strata Mechanics Institute (Poland)

Published in SPIE Proceedings Vol. 3054:
Optoelectronic and Electronic Sensors II
Zdzislaw Jankiewicz; Henryk Madura, Editor(s)

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