Abstract
A theoretical backup is offered for the strain space multiple mechanism model of cyclic behavior of sand presented by the author and his colleagues (Iai et al., 1992). The model presented previously was of a plane strain mechanism. By superposing the plane strain mechanisms around axes of arbitrary orientations, the present study demonstrates that the model can be extended into the three dimensional space. The study also shows that the model satisfies the objectivity, which is essential to a realistic constitutive model.
