Contributions to Proceedings:

G. Meschke, H.A. Mang:
"Application of a New Hypoplastic Material Model to 3D Finite Element Analyses of Concrete Structures";
in: "Proceedings of the 2nd International Conference on Computational Plasticity (COMPLAS II)", Pineridge Press, Swansea, 1989, 1219 - 1234.

English abstract:
In the theoretical part of this paper the mechanical fundamentals of a new hypoplastic material model for triaxially loaded concrete are described. In contrast to ordinary plasticity, hypoplasticity is characterized by the dependece of the rates of plastic strain and of the internal variables on the stress rate direction. The numerical part of the paper contains results from reanalysis of a triaxial material test by means of the proposed constitutive model as well as of three elasto-plastic material models from the literature. The load path consists of alternating volumetric and deviatoric segments, followed by deviatoric unloading and reloading. The numerical results demonstrate the potential of the developed hypoplastic model. The numerical part of the paper also contains results from re-analysis of a cylindrical concrete specimen subjected to a concentrated compressive force. It is shown that the numerical results are strongly influenced by the type of constitutive model used for the analysis. In contrast to the results obtained by two elasto-plastic constitutive models from the literature, the proposed hypoplastic material model yields results for the load-penetration relationship as well as for the ultimate load, which agree well with the corresponding test results.

Keywords: concrete, fem, plasticity, 3D, compression, structures, Finite Element, hypoplastic, trioxid, crushing

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