Tangent curve utilization for description of mechanical behaviour of pressed mixture

Herák, D.; Kabutey, Abraham; Sedláček, A.; Gürdil, Gürkan Alp Kağan

doi:10.17221/12/2010-rae

Cited by 16 publications

(11 citation statements)

References 19 publications

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“…2) which has been severally verified with the pressing of oilseed crops (Herak et al, 2010;2011a;2011b):…”

Section: Theoretical Limit Deformationmentioning

confidence: 84%

“…In addition from the results of this study, the tangent curve equation (Eq. 2) (Herak et al, 2010;2011a;2011b) comparing with the measured dependency, described ac- x max -true deformation, x o -deformation at oil point, δ-limit deformation, F o -compressive force at oil point, E o -deformation energy at oil point, E-maximal deformation energy curately the dependency between the compressive force and deformation characteristic of the pressed seeds. On the deformation curve of the pressed seeds (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…In this respect, Herak et al (2011b) established the tangent curve function to describe the deformation characteristics of pressed mixtures under compression loading. Also a finite element method (FEM) model was used by (Petru et al, 2012) to describe the mechanical behaviour of Jatropha curcas L. seeds under linear compression loading.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of the Mechanical Behaviour of Selected Oilseeds under Compression Loading

Herák

Kabutey

Divišová

et al. 2012

Not Bot Hort Agrobot Cluj

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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.

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“…2) which has been severally verified with the pressing of oilseed crops (Herak et al, 2010;2011a;2011b):…”

Section: Theoretical Limit Deformationmentioning

confidence: 84%

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Comparison of the Mechanical Behaviour of Selected Oilseeds under Compression Loading

Herák

Kabutey

Divišová

et al. 2012

Not Bot Hort Agrobot Cluj

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“…The present results, however, confirm the previously published studies focused on tangent curve models of mechanical behavior of bulk oilseeds of rape, sunflower and jatropha (Herak et al . 2011a,b, 2013a,b; Petru et al . ).…”

Section: Resultsmentioning

confidence: 99%

Mechanical Behavior of Enset (Ensete ventricosum) Pulp under Compression Loading – A Multipurpose Product in Ethiopia

Herák

Hrabě

Kabutey

et al. 2014

J Food Process Engineering

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The mechanical behavior of Enset pulp commonly known as "kocho" in Ethiopia was examined under compression loading test involving a compressive device and a pressing vessel. The pulp was pressed at initial pressing height 70 mm at deformation values ranging between 5 mm and 30 mm and pressing speed 10 mm/min. Applying the tangent curve equation, the mathematical description of the dependency between compressive force and appropriate deformation of Enset pulp was described. The maximal yield of liquid contained in the pulp and the liquid emerged during the pressing process were determined. The dependency between liquid emerged and deformation was mathematically described, which showed a linear function. It was further observed that the liquid contained in the pulp surfaced throughout the pressing process. Deformation energy, volume energy and gradient volume energy in relation to deformation were respectively calculated. It was seen that deformation of Enset pulp at 20 mm was energy efficient compared with deformations lower or greater than 20 mm. PRACTICAL APPLICATIONThe theoretical linear model determined in this present study for the description of mechanical behavior of Enset pulp under compression loading provides useful information for application in nonlinear pressing involving screw presses for the design and development of simple technology for optimization of energy requirement in Enset pulp processing and other important products. This new technology when developed would contribute substantially to the improvement of Ethiopian's and other African countries' food security.

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“…The pressure gradient thus causes a change in the mechanical behaviour of plant seeds during pressing. To some extent, however, the pressing force or volume energy and the deformation characteristics are globally (strictly) monotonic increasing functions (Faborode, Favier 1996;Očenášek, Voldřich 2009;Tavakoli et al 2009;Herák et al 2010;Herák et al 2011); thus, if the pressing force is increased the deformation increases. In the same way, with some value of the pressing force, volume energy and the deformation characteristics are the local monotonic functions, and thus if the deformation is increased, the pressing force remains constant or decreases.…”

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confidence: 99%

Mechanical behaviour of several layers of selected plant seeds under compression loading

Herák¹,

Kabutey²,

Sedláček³

et al. 2012

Res. Agric. Eng.

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Herák D., Kabutey A., Sedláček A., GŰrdil G., 2012. Mechanical behaviour of several layers of selected plant seeds under compression loading. Res. Agr. Eng., This article is focused on the determination of the mechanical behaviour of several layers of plant seeds namely; garden pea (Pisum sativum L.), common bean (Phaseolus vulgaris L.), common sunflower (Helianthus annuus L.) and jatropha (Jatropha curcas L.) seeds under compression loading. The results from the experiment showed that during compression plant seeds may change their mechanical behaviour that is deformation characteristic ceases to be a function of growing and beginning to resemble that of trigonometric functions and this behaviour is called the "wave effect". Also the strain value at which there is no further change of the mechanical behaviour is actually a local maximum of deformation characteristic and this is called the limit deformation. Exceeding this value can cause vibration of the presser including other negative factors which influences the process of pressing. The amounts of the limit deformation, strain energy and volume energy for jatropha, common bean, common sunflower and garden pea were determined in this experiment. From the calculated amounts of the volume energy, garden pea had the best resistance to change in the mechanical behaviour due to the fact that its change in the mechanical behaviour was not discovered. The other plant seeds; common beans, common sunflower and jatropha with respect to resistance to change in the mechanical behaviour followed in that order of magnitude.Keywords: jatropha; common bean; garden pea; common sunflower; pressing; wave effect In oil extrusion with usual extruders used in industrial practice, there is non-linear compression of pressed mixture incurred during the processing. This means that the compression is combination of translational movement moving and rotational movement. For better understanding of mechanical behaviour of plant seeds under compression loading, it is necessary first to understand mechanical behaviour of one free placed seed and one layer of seeds with limited deformation and also mechanical behaviour of more layers of the seeds. Earlier experiments conducted with plant seeds, namely jatropha, palm oil, sunflower and knotweed, showed that the specific strain energy required for deformation of one free placed seed was much greater than for pressing the same seeds layer (Fomin 1978; Blahovec, Řezníček 1980;Herák et al. 2007). There is a dynamic effect on plant tissue and thus higher cell damage (Addy et al. 1975), which is arising due to radial pressure during pressing, the gradual deformation of seeds, seeds of mutual friction and friction of the seed on the pressing vessel. There is also a required gradient of pressing pressure, and thus if the pressure gradient is inVol. 58, 2012, No. 1: 24-29 Res. Agr. Eng.

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Tangent curve utilization for description of mechanical behaviour of pressed mixture

Cited by 16 publications

References 19 publications

Comparison of the Mechanical Behaviour of Selected Oilseeds under Compression Loading

Comparison of the Mechanical Behaviour of Selected Oilseeds under Compression Loading

Mechanical Behavior of Enset (Ensete ventricosum) Pulp under Compression Loading – A Multipurpose Product in Ethiopia

Mechanical behaviour of several layers of selected plant seeds under compression loading

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