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vol. 19, nr. 3 (2012)
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Theoretical foundations of compaction and compression of granular materials of vegetable origin with properties of plasticity
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Jarosław Czaban, Zbigniew Kamiński
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Faculty of Mechanical Engineering, Bialystok University of Technology ul. Wiejska 45A, 15-351 Białystok |
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vol. 19 (2012), nr. 3,
pp. 487-500
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abstract:
The processes of compaction and compression of materials of vegetable origin can be used in loose pellets and briquette production for animal feeding and for fuel. These processes require large amounts of energy, up to 40-70 kWh t-1. The study was based on the yield condition formulated by Kuhn and Downey and its modifications. Physical relationships for the analysis of stress and strain in modelling of compaction process of materials of vegetable origin with properties of plasticity are described. The analysis uses the basic functions of porosity and the Amontons-Coulomb and Prandl laws of friction for porous materials. The experimental and theoretical tests of compression of fodder mixture with straw were performed in a closed chamber. The identification of material constants was made by using numerical methods and nonlinear regression equations describing the pressure on the stamp of the chamber. The results of experimental and theoretical compression of fodder mixture with straw indicated a possibility of wider use of the theory of plasticity in the modelling of other more sophisticated briquetting and pelleting processes of granular materials of vegetable origin in piston and rotary presses.
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keywords:
granular solids, compaction, compression, yield criterion
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original in:
Polish
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