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Critical state elasto-plastic constitutive models for soil failure in tillage - A review

Critical state elasto-plastic constitutive models for soil failure in tillage - A review,S. Karmakar,J. Sharma,R. L. Kushwaha

Critical state elasto-plastic constitutive models for soil failure in tillage - A review   (Citations: 3)
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On the other hand, if a particular stress path puts the stress state of the soil on or outside the yield locus, plastic or irrecoverable deformation of soil occurs. Elasto-plastic constitutive models help distinguish between the recoverable and irrecoverable deformations for understanding the stress strain behaviour of soil during loading and unloading. Kushwaha and Shen (1994) reported that a substantial soil deformation is associated with the generation of non-linearity in stress-strain relation in agricultural soil failure with tillage tool interaction. This leads to a large amount of irreversible deformation after the removal of the load, indicating that plastic deformation dominates in agricultural operations. Tillage is concerned with the top soil strata (up to about 1000 mm depth). Thus the metric suction and pore pressures, which are significant in geotechnical engineering problems like stability of slope, foundation of structures, etc., do not contribute much to the constitutive modeling for tillage. Elastic and plastic models, primarily based on the assumption of soil isotropy, have been used to model tillage tool interaction with soil. The force experienced by a tillage tool is influenced by both the stiffness and the strength of the soil. This is also affected by the stress history of soil with an anisotropic behaviour. The modeling of soil-tool interaction using numerical methods can be improved further by incorporating strain-dependent stiffness and strength of soil associated with soil anisotropy. Therefore, the objective of this paper was to study the pertinent soil constitutive models based on critical state soil mechanics in relation to their application to soil failure in tillage.
Published in 2004.
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