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vol. 2, nr. 1 (2003)
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Role of deformation velocity during measurement of seeds deformability coefficient
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Zbigniew Ślipek, Jarosław Frączek, Sławomir Francik
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Department of Machine Design, University of Agriculture, ul. Balicka 104, 30-149 Kraków |
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vol. 2 (2003), nr. 1,
pp. 243-253
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abstract:
The paper presents results of research aiming to define an effect of deformation velocity on a value of a seeds deformability coefficient En. The coefficient En was defined as amount of work Wn [J] required to deform seeds of given density ρ [kg m-3]. It was determined during a compression test of seeds squeezed between two parallel plates. The test was carried out with the Instron testing machine at five displacement velocities: 5, 10, 20, 30, 50 [mm min-1]. Reading of deformation values takes place at the pressure force equal to 20 [N]. The number of repetitions was equal to 50. The tests were conducted on six kinds of seeds, differing form each other by shape and size, namely Roma wheat, Dańkowskie Złote rye, Szelejewska vetch, Mirella lupine, Nike pea and Jubilatka bean. The moisture content of the tested seeds was equal to 0,23 [kg kg-1]. The analysis of obtained results showed that for determining the seeds deformability coefficient during the compression test of seeds squeezed between two parallel plates the deformation velocity should be equal to 10 [mm min-1].
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keywords:
elasticity, Young’s elasticity modulus, seeds, deformation velocity, modelling
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original in:
Polish
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