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Stress Under Belts and Radial Tires with Various Wt Distributions
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English
Abstract
In a series of field experiments we measured the stresses in sand beneath the rubber belt of a prototype belted tractor and beneath single front and dual rear tyres of a radial ply type equipped tractor, using earth stress cells installed beneath the belt or tyres. The stress in the sand increased with increasing axle load for both belt and tyres. The peak vertical stress beneath the belt was about 6 times the average stress calculated as total weight divided by total area of belt. Depending on axle load, the stresses near the soil surface were similar beneath belts and tyres, whereas at 35 to 45 cm depth the stresses beneath tyres exceeded those beneath belts. Stresses beneath individual wheels on the track bogey could be distinguished near the soil surface, but at 35 to 45 cm depth only the average stress could be identified.
Analysis of the experiments using a three-dimensional finite element model confirmed that at depth the stresses beneath a belt would be smoothed out such that only groups of wheels could be identified.
To avoid compaction, axle loads should be reduced and low pressure tyres used, wherever posssible. However, the most important consideration is the moisture content of the soil.
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Citation
Kirby, M. and Zoz, F., "Stress Under Belts and Radial Tires with Various Wt Distributions," SAE Technical Paper 972733, 1997, https://doi.org/10.4271/972733.Also In
References
- Kirby, J.M. Mockler, S. Zoz, F. Influence of varying axle load and tyre pressure on soil stresses and resulting compaction Society of Automotive Engineers, International Off-Highway & Powerplant Congress and Exposition Milwaukee, Wisconsin September 11-13 1995 SAE Technical paper 952096
- Blunden, B.G. McLachlan, C.B. Kirby, J.M. Technical note: a method of measuring in situ soil stresses due to traffic Soil and Tillage Research 25 35 42 1992
- Kirby, J.M. Critical state soil mechanics for unsaturated soils - measuring the parameters and predicting deformations Larson, W.E. Blake, G.R. Allmaras, R.R. Voorhees, W.B. Gupta, S.C. NATO Advanced Workshop on Mechanics and Related Processes of Structured Agricultural Soils Univ. Minnesota USA 13-16 Sept. 1988 Kluwer Acedemic Publishers Dordrecht 244 1989
- Kirby, J.M. Blunden, B.G. Trein, C.R. Simulating soil deformation using a critical state model: 2 soil compaction beneath tyres and tracks European Journal of Soil Science 1995
- Pollock, D. Perumpral, J.V. Kuppusamy, T. Finite element analysis of multipass vehicle effects on soil compaction Transactions of the American Society of Agricultural Engineers 29 45 50 1986
- Yong, R.N. Fattah, E.A. Skiadas, N. Vehicle traction mechanics Amsterdam Elsevier 1984
- Smith, I.M. Griffiths, D.V. Programming the Finite Element Method 2nd Edition Wiley Chichester 1988
- Kirby, J.M. Blunden, B.G. McLachlan, C.B. Soil stresses beneath tracked and tyred vehicles The Australian Cotton Grower 12 46 49 1991
- Blunden, B.G. McBride, R.A. Daniel H. Blackwell, P.S. Compaction of an earthy sand by rubber tracked and tyred vehicles Australian Journal of Soil Research 32 1095 1108 1994
- Abu-Hamdeh, N.H. Carpenter, T.G. Wood, R.K. Holmes, R.G. Soil compation of four wheel drive and tracked tractors under various draft loads Society of Automotive Engineers. International Off-Highway & Powerplant Congress and Exposition Milwaukee, Wisconsin September 11-13 1995 SAE Technical paper 952098
- Kirby, J.M. Strength and deformation of agricultural soil: measurement and practical significance Soil Use and Management 7 223 229 1991
- Kirby, J.M. Critical state parameters and their variation for Vertisols in Eastern Australia J. Soil Science 42 487 499 1991