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13 February 1997 Measurement of local values of strains of the briquette by means of special resistance strain gauges
Jozef Rysz
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Proceedings Volume 3054, Optoelectronic and Electronic Sensors II; (1997) https://doi.org/10.1117/12.266695
Event: Optoelectronic and Electronic Sensors II, 1996, Szczyrk, Poland
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).
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Jozef Rysz "Measurement of local values of strains of the briquette by means of special resistance strain gauges", Proc. SPIE 3054, Optoelectronic and Electronic Sensors II, (13 February 1997); https://doi.org/10.1117/12.266695
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