ŞTEFAN, Elena-Mădălina; VOICU, Gheorghe; CONSTANTIN, Gabriel-Alexandru; STOICA, Dorel
May 2013
Metalurgia International;May2013, Vol. 18 Issue 5, p71
Academic Journal
The paper presents results of some experimental researches on the mechanical characteristics of seeds of three wheal (Triticum aestivum L.) varieties grown in Romania (Flamura, Trivale and Glosa). Uniaxial compression tests were performed and force-deformation curves were drawn for sets of 50 wheat seeds (chosen randomly) of each variety. The analyses of these curves were determined forces and relative deformations at bioyield and rupture point and energy consumed in deformation to the rupture point The natural variability, the large number of factors and the inherent randomness can be modelling based on stochastic theory. In this paper it was used cumulative distribution functions (Rosin-Raimnler, logistic) for the modelling, which describe the parameters above mentioned and noncumulotive distribution functions (normal, lognormal, gamma, Lorentz). Were drawn the cumulative and noncumulotive variation curves for the parameters mentioned and was estimated, by regression analysis, tlie experimental data correlation with mentioned distribution laws. It was found that the seed crushing force is higher the variety Flamura, being included in the limits of 71-255 N, while the relative deformation at rupture is higher at the variety Trivale (0.159-0.573) than for the varieties Flamura and Closa where the values were ft 147-0.329 for Glosa and 0.178-0.441 for Flamura. However, the highest value of the rupture energy had Glosa variety seeds which were placed in position "sideways " during the compression lest (over 0.02 J at about 85% of seeds).


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