Published in Scientific Papers. Series A. Agronomy, Vol. LXI, Issue 1
Written by F. Göksel PEKİTKAN, Reşat ESGİCİ, A. Konuralp ELİÇİN, Abdullah SESSİZ
The shear force and energy values of biological materials are very important data for suitable design of a cutting and pruning machines and related equipment. The objective of this study was to determine shearing force and shearing energy of cotton (Gossypium hirsutum L.) stalk at different shoots diameter as a function of knife type and knife edge angle. Dependent variables were maximum cutting force and cutting energy. The samples were obtained from the cotton experimental field at vegetation season for each plot. A universal test machine was used to measure the cutting force and the energy. The cutting energy was calculated by measuring the surface area under the cutting forcedeformation curve. As a result, the main effect of the knife edge angle on the cutting force and energy were found significant. The best and minimal results were determined at serrated 2 knife types to be 69.61 N and 25.61 N cm, respectively, followed by the serrated 1 and flat knife. The highest values were observed at flat knife type. Nevertheless, the cutting force and cutting energy increased with an increase in the knife edge angle from 50° to 90°. The maximum values were obtained at 90◦ both cutting force and cutting energy. At this angle, while the maximum cutting force and cutting energy were determined to be 93.18 N and 31.60 N cm, respectively. The main minimum values were obtained at 50° angle. Cutting force and energy values of cotton stalk were found highly correlated with the stalk diameter. Cutting force and energy increased with increase diameter of stalk. The maximum cutting force and cutting energy were obtained at 29.20 mm2 cross-sectional area as 102.30 N and 41.97 Ncm, respectively, while the minimum values of cutting force and cutting energy were obtained at 13.84 mm2 cross-sectional area as 47.28 N and 16.76 N cm, respectively.
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