Plasticity theory and the stress distribution beneath wheels

Karafiath, Leslie L.

doi:10.1016/0022-4898(71)90025-5

Cited by 15 publications

(3 citation statements)

References 3 publications

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“…[U] is permissible value of the compacting effect of the tractor wheel on the soil, kN/m. An empirical formula (3) was derived to calculate qmax based on experimental studies, which adequately reflects the findings of other researchers [15][16][17][18][19][20][21][22][23][24][25]:…”

Section: Methodsmentioning

confidence: 92%

Efficiency of tractor track scarifiers used for sowing grain crops

Hafizov

Khafizov

Nurmiev

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The paper explores the efficiency of tractor track scarifiers that, once mounted, are constantly used with tractors for performing various technological operations, including layout of seedbed and sowing. The efficiency of tractor track scarifiers is calculated using a mathematical model of agricultural implements. A performance indicator is total energy consumption that include the energy of the crop lost due to soil compaction by tractor wheels. The computational experiments show the efficiency of tractor track scarifiers for sowing. A power effect for a sowing machine used with a John Deere-9430 tractor is in the range of 8000-10000 MJ/ha.

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Section: Methodsmentioning

confidence: 92%

Efficiency of tractor track scarifiers used for sowing grain crops

Hafizov

Khafizov

Nurmiev

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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“…For the analysis presented here, the separation angle (a ) is assumed approximately equal to the angle 5. The literature contains some experimental and theoretical justification for this assumption (Refs 16,17)…”

mentioning

confidence: 99%

General Yield Conditions in a Plasticity Analysis of Soil-Wheel Interaction

Nowatzki¹,

Karafiath²

1972

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Plasticity theory and a general representation of the Mohr failure criterion are applied to the problem of soil-wheel interaction. Load, drawbar pull (or drag), torque are computed for a rigid wheel being driven on sand obtained from Jones Beach, Long Island, New York. Analytical results obtained from soutions using a conventional Mohr-Coulcomb linear failure envelope are compared to those obtained from a nonlinear solution. Conclusions are drawn from the comparison that attest the importance of considering the nonlinearity of failure envelopes in certain cases for accuracy of soil-wheel interaction prediction. Preliminary experimental results show reasonable agreement with predicted values of wheel performance parameters.

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“…Equation (15) refers to the conventional value of slip. In the model, slip and interface friction angle are 'assumed to be constant along the interface.…”

mentioning

confidence: 99%

Plasticity theory and the stress distribution beneath wheels

Cited by 15 publications

References 3 publications

Efficiency of tractor track scarifiers used for sowing grain crops

Efficiency of tractor track scarifiers used for sowing grain crops

General Yield Conditions in a Plasticity Analysis of Soil-Wheel Interaction

Effect of Speed on Tire-Soil Interaction and Development of Towed Pneumatic Tire-Soil Model

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