Soil Cutting and TillageAfter giving a brief history of tillage practices and implements used throughout the world dating back to ancient times, this book goes on to describe the basic soil mechanics techniques needed to calculate the forces developed in soil by simple-shaped cutting tools. The methods of measuring soil mechanical properties, water pressure in soil and shear rate effects are touched upon. A review is given of two and three dimensional soil cutting mathematical mechanics models to predict soil cutting forces and soil volumes disturbed by cutting and tillage tools, as well as the state-of-the-art of soil loosening, structural rearrangement and plant growth as affected by tillage tools. The author also includes an introduction to the analysis of traction machines. There are many numerical examples of mechanical analyses and predictions worked out in the various sections of the book as well as numerous unsolved problems at the end of a number of the chapters. Written in a textbook style, this monograph is ideal for anyone wanting to learn modern techniques for the mechanical description of soil cutting and tillage forces and soil volumes disturbed. |
Contents
INTRODUCTION TO TILLAGE AND EARTHMOVING | 1 |
VI | 3 |
SOIL MECHANICS | 13 |
Copyright | |
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90 Rake angle angle of internal average blade calculated chisel plow clay soil coefficient constant contact pressure critical depth crop cutting forces Deere & Company deformation diameter disk plow draft force earthmoving effective efficiency energy equations factors field friction angle Godwin and Spoor Grisso Hettiaratchi horizontal hydraulic conductivity implements increase internal friction John Deere load loam soil machine material maximum McKyes measured Mohr's circle moisture content moldboard plow narrow tools normal stress operation particles plate pore water predicted Raghavan rolling resistance sample sandy loam shank shear strength shear stress shown in Fig sinkage sino slip lines soil compaction soil cutting soil density soil dry density soil failure soil loosening soil mechanics soil strength soil surface speed strength tests subsoiler t/m³ Terramechanics tillage tools tire tracks traction force tractor triaxial test undrained values vehicle wedge wheels wheelslip