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Description
This work is concerned with the modeling of a cold-box sand, a composition of sand grains and a resin binder. To this end, experiments are performed which show the following characteristics: localization phenomena in form of a shear band, softening behaviour in the force-displacement curve, asymmetric behaviour for compression and tension. For this complex material a micromorphic continuum is used to model the behaviour of the sand. In addition to the degrees of freedom of a classical continuum, the micromorphic model has additional degrees of freedom, which represent the grains of sand in our analysed material. The macro-part of this model represents the binder of the cold-box sand. Subject of this work is the parameter identification of the cold-box sand for the homogeneous and inhomogeneous deformation state. For the inhomogeneous state, the sand specimen that we use for the homogeneous state is extended by a radial notch in the centre area. For both cases, homogeneous and inhomogeneous, the point in time shortly before the formation of the shear band is selected. This means that only the elastic region of the micromorphic model is relevant and therefore no plastic parameters need to be calculated. For the parameter identification in this work a 3D model is used.
