The investigations of creep phenomenon of sugar beet tissue
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Institute of Agricultural Mechanization, University of Agriculture- Głęboka 28, 20-612 Lublin, Poland
Publication date: 2021-08-20
Int. Agrophys. 1994, 8(3): 485-488
The investigations aiming at the analysis of the phenomenon of creep of sugar beet roots with the use of the resistance machine INSTRON 6022 were carried out. The samples of root tissue were exposed to rapid load (deformation) up to the stress of 1.273 MPa and then were held under constant stress for 24 min. The experiment was performed for roots of PN Mono 1 variety, in 3 measuring zones of different location in the root and different wooden bundles arrangement. The creep phenomenon was described with a standard, triparameter model equations. As a result of the experiment the graphs of relative deformation dependence on time were obtained and the rheological model constants were calculated by means of the least squares method. There were: modulus elasticity, modulus of deformation relaxation and viscosity coefficient. Low matching errors and high correlation coefficients testify high consistence of experimental and theoretical results. The mechanical beet root tissue parameters are different in higher and lower part of root due to its untypical, diversified anatomical structure.
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