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vol. 10, nr. 3 (2007)
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Uniaxial compression of rapeseed using apparatus with cuboid chamber
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Robert Rusinek1, Marek Molenda1, Joanna Sykut1, Natalia Pits2, Jerzy Tys1
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1 Institute of Agrophysics, Polish Academy of Sciences, ul. Doświadczalna 4, 20-290 Lublin |
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2 Karpenko Physico-Mechanical Institute of NAS of Ukraine, ul. Naukova 5, Lviv 79601, Ukraine |
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vol. 10 (2007), nr. 3,
pp. 677-685
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abstract:
A uniaxial compression apparatus was constructed, having a cubical test chamber of adjustable width. The bottom of the chamber and one of its walls were both supported on three load cells to permit determination of vertical and horizontal pressures. Tests were performed with rapeseed to validate the apparatus, to determine minimum specimen width, and to determine horizontal to vertical pressure ratio. Specimens 120 mm high (initially) and 120 mm long that had adjustable widths of 8, 14, 21, 27, 33, 39 and 44 mm were tested. Results showed that testing with specimens of width smaller than 10 seed diameters gave unstable values of pressure ratio. Results of tests with specimens wider than 10 seed mean geometric diameters gave values of pressure ratio consistent with those obtained earlier in cylindrical uniaxial compression apparatus.
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keywords:
granular material, minimum specimen dimension, pressure ratio, rapeseed, uniaxial compression, stress transmission
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original in:
English
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