The mechanics of cutting plant residues on a rigid and soil surface
Başlık çevirisi mevcut değil.
- Tez No: 400662
- Danışmanlar: DR. CLARENCE E. JOHNSON
- Tez Türü: Doktora
- Konular: Ziraat, Agriculture
- Anahtar Kelimeler: Belirtilmemiş.
- Yıl: 1995
- Dil: İngilizce
- Üniversite: Auburn Unıversıty
- Enstitü: Yurtdışı Enstitü
- Ana Bilim Dalı: Belirtilmemiş.
- Bilim Dalı: Belirtilmemiş.
- Sayfa Sayısı: Belirtilmemiş.
Özet
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Özet (Çeviri)
The mechanics of cutting four common plant residues (corn, cotton, soybean, and wheat) on a rigid and soil surface were investigated. Plant residue was cut with a flat and an angled knife positioned perpendicular to the residue fiber. Residue with different cross-sectional areas and moisture contents was cut in different sections along the stalk and in different locations between the internodes. Cutting forces, cutting stresses, cutting energy, and specific cutting energy were examined. Also, the effect of applying tensile force to the residue ends was examined during cutting corn, cotton and soybean residue on a rigid and soil surface. An Instron Testing Machine model 4201 was used to cut the residue on a rigid surface. The rigid surface was comprised of two plates secured on the Instron with a 6 mm gap to allow the knife edge to pass through. Residue was also cut on a Norfolk Sandy Loam soil with 5% moisture content. The soil was compacted with a roller to two levels of compaction; fairly compacted with two roller passes and most compacted with five roller passes. The cutting stress and specific cutting energy of all residues were independent of the cross-sectional area of the residue within a section between nodes. However, cutting stress and specific cutting energy requirements decreased significantly from bottom to the top of the residue. Generally, tensile force had no effect on cutting stress and specific cutting energy for both the flat and the angled knife with two exceptions: the cutting stress was higher on nodes for corn and soybean residues, and tensile force decreased the required cutting stress and specific cutting energy for corn residue. Dimensional analysis was used to develop an empirical function for cutting the plant residue on a rigid and soil surface. Two dimensionless ratios were found to be constants for a given residue and knife for cutting on a rigid surface. Two dimensionless ratios were found to be influential when cutting residue on a soil surface from which an empirical equation was developed for all four residues for each of the knives.
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