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During the past few decades the dramatic growth of computer technology has been paralleled by an increasing degree of complexity in material constitutive modeling. This paper discusses the development, testing requirements, and fitting procedure of elastic-plastic models.
A brief overview of the general characteristics of soil behavior which should be displayed by an elastic-plastic model is presented. The basic requirements and conditions of constitutive models are stated.
To construct an elastic-plastic type model the following (minimum) tests are required: (1) loading and unloading in isotropic consolidation and (2) loading and unloading in triaxial shear. Additional tests, such as uniaxial strain tests, proportional loading tests, direct shear tests, etc., are useful for verification of the model fits.
constitutive models, elastic-plastic models, soil characteristics
Research civil engineer, Geomechanics Division, Structures Laboratory, Waterways Experiment Station, Vicksburg, Miss.