Chapter

Holistic Simulation of Geotechnical Installation Processes

Volume 82 of the series Lecture Notes in Applied and Computational Mechanics pp 168-192

Date:

Computer Aided Calibration, Benchmarking and Check-Up of Constitutive Models for Soils. Some Conclusions for Neohypoplasticity

  • Andrzej NiemunisAffiliated withInstitute of Soil Mechanics and Rock Mechanics, Karlsruhe Institute of Technology Email author 
  • , Carlos Eduardo Grandas-TaveraAffiliated withInstitute of Soil Mechanics and Rock Mechanics, Karlsruhe Institute of Technology

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Abstract

A computer aided calibration, benchmarking and testing of constitutive models is presented. A large collection of test data for Karlsruhe sand is used together with the neohypoplastic model as an example. The essential feature of the procedure is an automatic evaluation of the discrepancies between a test and its simulation. They can be minimized by modifications of material constants or used as a benchmark for different models. Apart from the curve-fitting part one may check whether a constitutive model violates the Second Law. For this purpose several specially designed stress loops are tried out. A shake down of all state variables is established. The neohypoplasticity and the barotropic hypoelasticity are used as examples in the thermodynamic tests. In conclusion several modification to neohypoplastic models are presented.

Keywords

Second law Material calibration umat