Abstract
With reference to practical engineering problems it is shown that considerable differences may be encountered between the results from associated and those from non-associated plasticity theories. Next, the need for a non-associated plasticity theory is demonstrated by considering test results for sand, concrete and rock. Elementary material parameters are discussed such as Young’s modulus E and Poisson’s ratio υ for the description of the elastic properties, and a cohesion angle ψ and a friction angle φ for the determination of the strength. The salient difference from associated plasticity theory concerns the introduction of a dilatancy angle which controls the inelastic (plastic) volume changes. This dilatancy angle is not only a suitable parameter for the description of soils, but also appears to be useful for concrete and rock.KeywordsGranular MaterialTriaxial TestStress PathLimit LoadPlastic Strain RateThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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