scholarly journals Deformation energy of Jatropha curcas L. seeds under compression loading

2014 ◽  
Vol 60 (No. 2) ◽  
pp. 68-74 ◽  
Author(s):  
A. Kabutey ◽  
D. Herák ◽  
O. Dajbych ◽  
M. Divišová ◽  
W.E. Boatri ◽  
...  
Keyword(s):  
Moisture Content ◽  
Jatropha Curcas ◽  
Compressive Force ◽  
Smooth Curve ◽  
Deformation Energy ◽  
Deformation Curve ◽  
Wave Effect ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Function Smooth

The present research is a follow-up of the previous studies on mechanical behaviour of Jatropha curcas L. seeds under compression loading. The research describes in detail the deformation energy which was determined from the area under the force-deformation curve. The compression device ZDM 50-2313/56/18 with a chart recorder and pressing vessel of diameter 76 mm were used to record the force-deformation functions of varying moisture content between 8.46% and 36.50% w.b. of Jatropha curcas L. seeds. Under the force-deformation curve, three main descriptions namely the increasing function (smooth curve), wave-effect characteristics (serration effect) and whole area under the force-deformation curve were analysed. For each of the force-deformation curve descriptions, it was found that moisture content influenced the values of compressive force, deformation, deformation energy and seed hardness. Interestingly, the research findings conclude that moisture content is a primary factor contributing to the wave-effect characteristics on the force-deformation curve.  

scholarly journals Behaviour of different moisture contents of Jatropha curcas L. seeds under compression loading

2011 ◽  
Vol 57 (No. 2) ◽  
pp. 72-77 ◽  
Author(s):  
A. Kabutey ◽  
D. Herák ◽  
A. Sedláček
Keyword(s):  
Moisture Content ◽  
Jatropha Curcas ◽  
Unit Volume ◽  
Minimum Energy ◽  
Deformation Characteristic ◽  
Deformation Energy ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Moisture Contents ◽  
Jatropha Seeds

A study was conducted to investigate the behaviour of different moisture contents of Jatropha curcas L. seeds under compression loading. To obtain jatropha seeds of different moisture contents ranging from 1% (w.b.) to 37% (w.b.), the seeds were soaked in water and kept in a refrigerator at 5&deg;C for different number of days. Compression devices, namely ZDM 50-2313/56/18, pressing vessel with diameter of 76 mm and a pressing plunger of 90 mm height, were used. The amount of seeds in the pressing vessel was measured as 40 mm with compression force of 98,100 N. The results from the experiment showed that increasing the moisture content of the jatropha seeds influenced the force-deformation characteristic curve, deformation energy, maximum deformation and energy per unit volume. While moisture contents 1% (w.b.) and 10% (w.b.) displayed normal force-deformation characteristic, moisture contents 32% (w.b.) and 37% (w.b.) showed wave-effect characteristic. The R<sup>2</sup> coefficient of determination value of 0.87 obtained from the effect of moisture content on deformation energy and unit volume energy shows that jatropha seeds of moisture content 16% (w.b.) would require minimum energy but high efficiency during compression.

scholarly journals Comparison of the Mechanical Behaviour of Selected Oilseeds under Compression Loading

2012 ◽  
Vol 40 (2) ◽  
pp. 227 ◽  
Author(s):  
David HERAK ◽  
Abraham KABUTEY ◽  
Monika DIVISOVA ◽  
Tereza SVATONOVA
Keyword(s):  
Mechanical Behaviour ◽  
Compressive Force ◽  
Deformation Energy ◽  
Deformation Curve ◽  
Brassica Napus L ◽  
Compression Loading ◽  
Point Position ◽  
Deformation Ratio ◽  
Jatropha Seeds ◽  
Jatropha Seed

The present study provides information about the comparison of mechanical behaviour of selected oil bearing crops namely rapeseeds (Brassica napus L.), sunflower seeds (Helianthus annus L.) and jatropha seeds (Jatropha curcas L.) under compression loading. In this research, the compression device ZDM 50 with a chart recorder and a pressing vessel with diameter 100 mm were used to determine the relationship between the magnitude of the pressing force and deformation characteristics of the oilseed crops pressed at initial height 80 mm. From the compression test, the amounts of true deformation, maximal deformation energy and compressive force of the pressed samples were calculated and also mathematical equations describing the limit deformation, maximal deformation ratio, energy ratio and oil point deformation ratio were determined. The oil point position on the deformation curve, that is, the first leakage of oil from the pressing vessel of the various oilseeds was determined and compared. Based on the measured amounts rapeseeds achieved the highest values followed by jatropha seed and then sunflower seed. The amount of deformation energy required for the seed deformation gives the indication the amount of energy needed for obtaining the oil from the seed. It was found that the measured amounts as well as the oil point position on the force-deformation curve of the pressed samples showed varying results due to the seeds physical and inherent characteristics.

scholarly journals Estimation of Energy Requirement of Jatropha Curcas L. Seedcake Briquettes under Compression Loading

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1980 ◽  
Author(s):  
Tatiana Ivanova ◽  
Abraham Kabutey ◽  
David Herák ◽  
Cimen Demirel
Keyword(s):  
Mechanical Behaviour ◽  
Jatropha Curcas ◽  
Energy Requirement ◽  
Testing Machine ◽  
P Value ◽  
Force Coefficient ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Deformation Curves ◽  
Deformation Coefficient

The energy requirement of Jatropha curcas L. seedcake of different dimensions (4.5, 5.6, 6.7, 8 and 10 mm) for briquette compaction was investigated under compression loading (100, 200, 300 and 400 kN) using the universal compression-testing machine. The parameters measured and/or calculated were the deformation, thickness, numerical energy and theoretical energy. The statistical analysis results show that compression forces had a significant effect (P-value < 0.05) on the amounts of deformation and thickness, while that of the dimensions of the sample did not. The increase in compression forces increased the numerical energy while that of samples dimensions caused a decrease. Using the tangent curve mathematical model; the force coefficient of mechanical behaviour (kN), the deformation coefficient of mechanical behaviour and the fitting curve function exponent were determined for describing the experimental dependency between the force and deformation curves as well as the numerical energies of densified jatropha seedcake briquettes.

scholarly journals Effect of Moisture Content on the Mechanical Properties of Watermelon Seed Varieties

2021 ◽  
Vol 2 (2) ◽  
pp. 308-320
Author(s):  
Paul Chukwuka EZE ◽  
Eze CHIKAODILI ◽  
Ide PATRICK EJIKE
Keyword(s):  
Mechanical Properties ◽  
Compressive Strength ◽  
Moisture Content ◽  
Compressive Force ◽  
Deformation Energy ◽  
Vertical Loading ◽  
Watermelon Seed ◽  
Horizontal Loading ◽  
Effect Of Moisture ◽  
And Storage

The effect of moisture content on the mechanical properties of agricultural material is essential during design and adjustment of machines used during harvest, cleaning, separation, handling and storage. This study determined some mechanical properties of Black and Brown colored of watermelon seed grown in Nigeria under different moisture contents range of 6.5 to 27.8% (d.b). The results for the mechanical properties obtained ranged from 15.68-29.54 N for compressive force; 1.95-3.40 mm for compressive extension; 0.13-0.33 N mm-2 for compressive strength; and 0.17-1.93 kJ for deformation energy at vertical loading position while at horizontal loading position, results obtained ranged from 14.71-38.36 N for compressive force; 1.94-4.20 mm for compressive extension; 0.16-0.32 N mm-2 for compressive strength; and 1.47-76.39 kJ for deformation energy for Black colored watermelon seed. The compressive force, compressive extension, compressive strength, deformation energy ranged from 14.18-36.49 N, 1.85-5.20 mm, 0.19 0.76 N mm-2, 26.23-189.75 kJ at vertical loading position and 16.47-41.82 N, 1.68-11.08 mm, 0.34- 0.57 N mm-2, 27.67-319.99 kJ at horizontal loading position for Brown colored watermelon seed. The correlation between the mechanical properties and moisture content was statistically significant at (p≤0.05) level. It is also economical to load Black colored in vertical loading position at 27.8% moisture content and Brown colored in vertical loading position at 27.8% moisture content to reduce energy demand when necessary to crack or compress the seed. This research has generated data that are efficiently enough to design and fabricate processing and storage structures for Black and Brown water melon seeds.

Relaxation behaviour of Jatropha curcas L. bulk seeds under compression loading

2014 ◽  
Vol 125 ◽  
pp. 17-23 ◽  
Author(s):  
David Herak ◽  
Abraham Kabutey ◽  
Michal Petru ◽  
Petr Hrabe ◽  
Petr Lepsik ◽  
...  
Keyword(s):  
Jatropha Curcas ◽  
Relaxation Behaviour ◽  
Compression Loading ◽  
Jatropha Curcas L

scholarly journals DETERMINING PHYSICAL PROPERTIES OF JATROPHA CURCAS L. GRAINS

2018 ◽  
Vol 2 (4) ◽  
pp. 6-11
Author(s):  
Ednilton Tavares Andrade ◽  
Renan Pereira Rezende ◽  
Jacqueline Brasil ◽  
Neila Freixo ◽  
Patrícia Araújo
Keyword(s):  
Moisture Content ◽  
Physical Properties ◽  
Mathematical Models ◽  
Experimental Analysis ◽  
Jatropha Curcas ◽  
Specific Weight ◽  
Terminal Velocity ◽  
Size And Shape ◽  
Jatropha Curcas L ◽  
Moisture Contents

The objective of this study was to determine the physical properties of Jatropha curcas grains, such as: size, shape, density and porosity, and to determine the terminal velocity, comparing the results with those calculated from mathematical models available in the literature. To perform the experimental analysis, samples with different moisture contents, between 4 and 25% (wb), were selected. To determine the size and shape of the grains, sphericity and roundness characteristics were used, and it was found that both stay approximately constant, despite different moisture content. For specific weight and porosity, results show that the porosity is directly proportional to the moisture content until the point where interaction between the moisture content and volumetric contraction causes the specific weight to increase again, thus decreasing porosity. It was also found that the equation used for calculating the terminal velocity is in agreement with the results obtained experimentally. Furthermore, the results also show that the terminal velocity for the Jatropha grains is directly proportional to its moisture content.

scholarly journals Deformation Curve Characteristics of Rapeseeds and Sunflower Seeds Under Compression Loading

2014 ◽  
Vol 45 (3) ◽  
pp. 180-186 ◽  
Author(s):  
M. Divišová ◽  
D. Herák ◽  
A. Kabutey ◽  
V. Šleger ◽  
R. Sigalingging ◽  
...  
Keyword(s):  
Deformation Characteristic ◽  
Compressive Force ◽  
Deformation Energy ◽  
Deformation Curve ◽  
Sunflower Seeds ◽  
Oilseed Crops ◽  
Deformation Curves ◽  
Oil Flow ◽  
Increasing Function

Abstract The deformation curve characteristics of rapeseeds and sunflower seeds compressed using the equipment ZDM 50-2313/56/18 and varying vessel diameters (40, 60, 80, and 100 mm) were investigated. Maximum compressive force of 100 kN was applied on bulk oilseeds of rape and sunflower of measured height 20-80 mm and deformed at a speed of 60 mm∙min-1. The compression test using the vessel diameters of 40 and 60 mm showed a serration effect while the vessel diameters of 80 and 100 mm indicated an increasing function effect on the force-deformation characteristic curves. Clearly, the increasing function effect described the region with oil flow and that of serration effect described the region without any oil flow. However, it was observed that the serration effect could be due to the higher compressive stress inside the smaller vessel diameters (40 and 60 mm) compared to those with bigger vessel diameters (80 and 100 mm). Parameters such as deformation, deformation energy, and energy density were determined from the force-deformation curves dependency showing both increasing function and serration effect. The findings of the study provide useful information for the determination of specific compressive force and energy requirements for extracting maximum oil from oilseed crops such as rape and sunflower.

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