Project Details
Projekt
Neo-Hypoplasticity
Applicant
Privatdozent Dr.-Ing. Andrzej Niemunis
Subject Area
Geotechnics, Hydraulic Engineering
Term
from 2009 to 2017
Project identifier
Deutsche Forschungsgemeinschaft (DFG) - Project number 76838227
The novel constitutive routine, „neohypoplasticity“ will be implemented in form of a user routine for applicator in FE programs. The main task of the present subproject is the derivation of exact incre-mental constitutive equations for the implicit time integration rather than mathematical description of physical phenomena. The main objective is the numerical stability, the robustness and the effective-ness of the resulting code. Another task of this subproject is to formulate a calibration procedure for the material constants of „neohypoplasticity“. Unclear procedures for determination of material param-eters can severely obstruct its practical application of a constitutive model. Further task is formulation of a new user element routine. It will be developed for an existing high cycle model for soils. The con-ventional elements with this material model suffer from excessive numerical self-stresses. The objec-tive is to circumvent the self-stress problem by means of increasing the flexibility of the element. Since the planned tasks of our research group pertain not only to the build up of pore water pressure but also the dissipation thereof, the programming of the consolidation equations is indispensable in the new element.
DFG Programme
Research Units
