In this work, the consequenses of the stability conditions in elasto-plastic and elastoviscoplastic constitutive formulations for concrete materials are analyzed. In particular, the criterion for local instability by Hill is considered and its performance is analyzed by means of the directional stiffness modulus. The numerical results for the stress path of the instability test by Smith illustrate the influence of the grade of nonassociativity and of the viscosity in the performance of the instability condition.
Published on 01/10/97
Accepted on 01/10/97
Submitted on 01/10/97
Volume 13, Issue 4, 1997
Licence: CC BY-NC-SA license
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