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vol. 4, nr. 3 (2004)
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Investigation of mechanical properties of faba bean for grinding behavior prediction
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Grzegorz Łysiak, Janusz Laskowski
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Department of Machine Operation in Food Industry, University of Agriculture ul. Doświadczalna 44, 20-236 Lublin |
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vol. 4 (2004), nr. 3,
pp. 753-762
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abstract:
The paper presents results of studies concerned with the relationships between mechanical properties of a material and grinding process parameters. Polish variety of faba bean cv. Nadwiślański was used in the studies. Universal testing machine Zwick Z020 was adapted to the material properties determination. On the basis of load-deformation curves, characteristic values of loads, seed deformation, and energy inputs during crushing were determined. Grinding experiments were made with the help of a small laboratory hammer mill. Influence of moisture on the character of load-deformation curves and specific energy requirements during grinding were evaluated. For low material moisture levels, sharp fracture as a result of load (internal stresses) was observed. More relevant contribution of strain, plastic in nature, for moist seeds resulted in their distinct fracture mechanism. The increase of seed moisture caused larger deformability relative to the loads applied. Grinding process of moist bean seeds required more energy to be utilized. Relevant relations of energy requirement according to change in seeds moisture and their mechanical properties were observed.
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keywords:
faba bean, mechanical properties, grinding
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original in:
English
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