The effect of surface coating on lug forces | |
| Author | Manzoor, Shaukat |
| Call Number | AIT Thesis no. AE-88-11 |
| Subject(s) | Trafficability Tractors--Wheels |
| Note | A thesis submitted in partial fulfillment of the requirements for the degree of Master of Engineering, School of Environment, Resources and Development |
| Publisher | Asian Institute of Technology |
| Abstract | Experiments were conducted to study the effect of surface coating on lug forces in a laboratory soil bin with the help of a single model lug. For these experiments Teflon tape, Ceramic tile and Enamel coatings were used. The lug normal and tangential forces were measured with the help of 'L' shaped transducer. These forces were then converted to pull and lift forces. The measured lug forces for coated lugs were compared with the lug forces produced by the uncoated lug. The normal forces for all lugs increased as lug rotation increased up to a certain degree of lug rotation and then it dropped as lug rotation increased further. The tangential component of lug forces increased initially till it reached a certain positive peak value and then it continuously dropped showing negative force component. At about lug exit it further rose and finally reached zero. The general trends for lug pull and lift forces were almost the same as for lug normal and tangential forces. At constant sinkage, slip and soil moisture content, lug forces generated by coated lug didn't differ significantly than that generated by uncoated lug. Increase in lug sinkage caused proportional increase in lug forces. At 40% soil m.c. and 35% slip the peak pull force produced by the lugs at 6.5 cm sinkage were 1.75 and 1.25 times more than that found at 2.6 and 4.5 cm sinkage, respectively. At any constant sinkage the lug force produced by various lugs were almost the same. Lug slip did not affect . the lug forces significantly. Increase in soil moisture content caused decrease in lug forces. The values of peak pull and lift forces obtained at 40% moisture content and 6.6 cm sinkage were almost 3 and 14 times more than that obtained at 56% moisture content and flooded soil condition, respect! very. A comparison of measured and predicted values of lug forces using the passive earth pressure theory indicated that theory over predicted the pull and lift forces at 40% soil moisture content while it under predicted at 65% soil moisture content. Among various materials tested enamel coating was found to be the most promising. |
| Year | 1988 |
| Type | Thesis |
| School | School of Environment, Resources, and Development (SERD) |
| Department | Other Field of Studies (No Department) |
| Academic Program/FoS | Agricultural and Food Engineering (AE) |
| Chairperson(s) | Salokhe, Vilas M. |
| Examination Committee(s) | Gee-Clough, D. ;Singh, Gajendra ;Gupta, Chandra P. |
| Scholarship Donor(s) | The Royal Government of Norway |
| Degree | Thesis (M.Eng.) - Asian Institute of Technology, 1988 |