Mechanical properties of sugar beet root during storage

Nedomová, Šárka; Kumbár, Vojtěch; Pytel, Roman; Buchar, J.

doi:10.1515/intag-2016-0081

Cited by 14 publications

(13 citation statements)

References 41 publications

(31 reference statements)

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“…These values were similar to those obtained by the other authors under quasi-static load conditions (Gorzelany and Sosnowski, 2003;Nedomova et al, 2017). Whereas the values of critical strains were over three times greater than those obtained by other researchers under the quasistatic load conditions (Nedomova et al, 2017). The time required to damage a sample at an impact velocity of 1 m s -1 is about 2.5 10 -3 s. In the case of a typical compression test of a 20 mm high sample at 20 mm min -1 it may take as long as 10 s. Besides tissue structures, the plant materials, which contain a large quantity of water, also contain some amounts of gases in the intercellular spaces.…”

Section: Results and Disscussionsupporting

confidence: 92%

“…As previously mentioned the tendency for a small drop in the critical stress values was observed during the experiment. These values were similar to those obtained by the other authors under quasi-static load conditions (Gorzelany and Sosnowski, 2003;Nedomova et al, 2017). Whereas the values of critical strains were over three times greater than those obtained by other researchers under the quasistatic load conditions (Nedomova et al, 2017).…”

Section: Results and Disscussionsupporting

confidence: 91%

“…Gorzelany and Matłok (2014) found some differences in the damaging force value depending on the variety studied. Nedomova et al (2017) compared the effectiveness of the tests of mono-axis compression of free sample and the penetration test during a 77 day storage period. They found that the root strength increases with storage time compared to the results obtained in the penetration test.…”

Section: Introductionmentioning

confidence: 99%

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Impact characteristics of sugar beet root during postharvest storage

2019

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The effects of time of sugar beet root storage on the parameters determined by impact testing were studied. The 9 mm diameter and 20 mm high cylindrical samples were cut crosswise and lengthwise along the root axis. The impact velocity was 1 m s-1 and the change in the response force over time was observed at both ends of the sample. The measurements were made directly after harvesting and after 24, 48, 96 and 120 h of storage at room temperature. Failure stress and strain, impact energy, absorbed energy, Young's modulus and shock wave speed were determined in the sample tissue from the change in the response force at both ends of the sample. A drop of 40% in the average values of the energy required to damage the samples was observed during 120 h of storage. A similar dependence was found for the energy absorbed by the sample as evidenced by the greater susceptibility of the roots to impact loads. The experiment confirms the importance of critical stress criterion for cylindrical samples of sugar beet. The velocities of shock wave propagation obtained from the samples during impact were in the range of 220-384 m s-1 and were not correlated with the other experimental parameters. K e y w o r d s: sugar beet root, impact energy, absorbed energy, storage time

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Section: Results and Disscussionsupporting

confidence: 92%

Section: Results and Disscussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Impact characteristics of sugar beet root during postharvest storage

2019

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“…4.06. The material stress and strain were calculated as the true stress and the Hencky's strain of the cylindrical pellet samples in compression loading (Nedomová et al, 2017). The loading curves of the dependence of the stress on the strain were made.…”

Section: Fig 1 Compression Test Of the Cylindrical Spruce Sawdust Pementioning

confidence: 99%

“…The apparent energy density W at failure was defined as the total work of deformation in the sample volume (Nedomová et al, 2017):…”

Section: Fig 1 Compression Test Of the Cylindrical Spruce Sawdust Pementioning

confidence: 99%

Spruce pellets in compression loading

Kubík¹,

Petrović²

2018

J Proc Ener Agri

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Compression loading of sawdust pellets could be useful for studying the mechanical and structural properties of materials. Mechanical properties such as the failure stress and strain, the modulus of elasticity, the bulk modulus, the compressibility and the deformation energy can be used to evaluate the behaviour of pellets under static loading. The deformation energy as the apparent energy density was determined by integrating loading stress-strain curves between the initial point and the point of strength failure. A testing machine Andilog Stentor 1000 was employed for compression testing. The pellet samples were tested at a constant speed of 10 mm.min-1. The true stresses and the Hencky's strain were determined in compression loading. The Cauchy's strain gives the relative deformation with regard to the initial sample height. The Hencky's strain derives from the integration of the infinitesimal strain. The true stress is evaluated using the instantaneous cross section of the sample. The loading curves of the dependence of the stress on the strain were realized, and the moduli of elasticity and the bulk moduli were determined from the compression diagrams respectively.

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Mechanical properties and compositional characteristics of beet (Beta vulgaris L.) varieties and their response to nitrogen application

Schäfer

Hale

Hoffmann³

et al. 2020

Eur Food Res Technol

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Mechanical properties of sugar beet are important during harvesting and processing. To potentially correlate mechanical properties with structural features of cell wall polymers, four different Beta varieties (Beta vulgaris L.) were characterized for their mechanical properties and cell wall composition. In addition, the influence of nitrogen fertilization was analyzed. Additional nitrogen fertilization only slightly influenced mechanical properties and cell wall composition. Hardly any structural differences of cell wall polysaccharides were observed for all Beta varieties. Slight differences in alcohol insoluble residue and protein contents, in amino acid profiles of proteins, and in esterification degree of pectins were found. The Beta varieties differed in their contents of cell wall bound phenolic components, and particularly in their dry matter contents. Analyses of mechanical properties of the Beta varieties demonstrated differences in tissue firmness and compressive strength. However, no evidence was found that the observed differences of cell wall composition are responsible for the divergent mechanical properties, with the exception of water contents that were higher in samples with less compressive strength.

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Mechanical properties of sugar beet root during storage

Cited by 14 publications

References 41 publications

Impact characteristics of sugar beet root during postharvest storage

Impact characteristics of sugar beet root during postharvest storage

Spruce pellets in compression loading

Mechanical properties and compositional characteristics of beet (Beta vulgaris L.) varieties and their response to nitrogen application

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