the initial stage and combined to give the final state of stress. It is believed that a theory which violates the thermodynamic principle is not able to represent the material behaviour accurately. The classical theory of plasticity is developed based on the mechanical process. Experimentally it is very difficult to find out the yield surface in the case of three dimensional stress spaces. The expression for yield and potential surfaces are simply mathematical expressions formulated for computational efficiency. The definition of yield surface depends on the location of the yield point.īut in practical sense it is very difficult to find out the exact yield point for a material. The classical theory of plasticity is always associated with the concept of yield surface and potential surface to represent the plastic behaviour. All the existing constitutive models which represent the plastic behaviour of soil are developed from the fundamentals of classical theory of plasticity. Nowadays for most of the geotechnical engineering applications the elastoplastic models like Mohr Coulomb model are widely used. The major requirement for such analysis is a good constitutive model that represents the stress strain behaviour of the materials in an accurate way. The introductions of large digital computers in the field of engineering have rendered possible the solution of a wide variety of problems without the need to violate the equilibrium and compatibility.
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