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. See test/incremental_driver in your distribution on how to use it.

The following experiments can be used:

• oedometric
• triax
• direct shear
• hydrostatic compression

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