Incremental Driver

A dedicated special purpose incremental driver has been developed which is able to calculate the results of homogeneous experiments. Both displacement controlled and force controlled experiments can be performed. The program is fully parallised; it can calculate fast large amounts of experiments. For pricing see the order form.


The following experiments can be used:

- oedometric

- triax

- direct shear

- hydrostatic compression


The following combined experiments can be used:

-  each combined experiment can contain many single experiments following each other

-  each single experiment can be either force controlled or displacement controlled

-  many combined experiments can be specified


The following material laws can be used:

- mohr-coulomb

- all hypoplastic laws in Tochnog

- user supplied routine umat.f (on linux 64 bit only)

- either drained or non-drained

- each experiment can use a different material law


The following deformation models can be used:

- engineering strains small deformation

- updated lagrange large deformations.


Results are printed for:

- all stresses , 6 components of the symmetric Cauchy stress tensor

- all strains, 6 components of the symmetric engineering strains (small deformations) or logarithmic strains (large deformations)

- pressure (water pressure in undrained experiments)

- soil void ratio (if hypoplastic laws are used)


Examples are shown below.

We use the geotechnics convection in which compression is positive and extension is negative. Click on pictures to get a large picture.

The corresponding input files can be found in your distribution in  the directory test/incremental_driver.


triaxial compression test, undrained

mohr-coulomb,effective stress path

triaxial compression test, undrained

mohr_coulomb, axial strain - q

triaxial compression test, undrained

mohr_coulomb, effective and total stress path

triaxial compression test, undrained

mohr_coulomb, axial strain - pore pressure

oedometric compression test, drained

mohr_coulomb, stress strain behaviour

direct shear test, undrained

hypoplasticity, volumetric behaviour

direct shear test, undrained

hypoplasticity, shear strain behaviour


... FEAT