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Dear @jvaara, maybe it wasn't the last working version of the code you uploaded. I found a miss match in PlasticIteration signature. umat_models/gurson_porous_plasticity.f90 (or actually gfortran found)

 360: subroutine PlasticIteration(f,ep,DEp,DEq,DDSDDE,STRIAL,X,epn,fnn,MAXITERS,TOL,PROPS,NPROPS,NTENS,NDI,res,DISP)
1198:       call PlasticIteration(f,ep,DEp,DEq,DDSDDE,STRIAL,X,MAXITERS,TOL,PROPS,NPROPS,NTENS,NDI,res,DISP-1)

I can try to use BinaryBuilder.jl to create cross-compiled example model library. @IvanYashchuk do you have suitable UMAT for testing?

See original issue: JuliaFEM/JuliaFEM.jl#43

Someone else proposed this earlier, I couldn't find it. Anyway, I found the list of UMAT Utilities:
– SINV will return the first and second invariants of a tensor.
– SPRINC will return the principal values of a tensor.
– SPRIND will return the principal values and directions of a tensor.
– ROTSIG will rotate a tensor with an orientation matrix.
– XIT will terminate an analysis and close all files associated with the analysis properly.

If we want to have full compatibility we will eventually need to support these Fortran subroutines.

Also #6 is a same thing.

#14 implements stress and strain in tensor format. However, shear stress and strains are in incorrect order, see: Ferrite-FEM/Tensors.jl#122.

According to Tensors.jl documentation tovoight index order is [11, 22, 33, 23, 13, 12, 32, 31, 21] while according to Abaqus Analysis User's Guide: 1.2.2 Convention used for stress and strain components the index order is [11, 22, 33, 12, 13, 23].

I cannot install UMAT.Jl in Julia 1.2.0

ERROR: Unsatisfiable requirements detected for package BinaryProvider [b99e7846]:
 BinaryProvider [b99e7846] log:
 ├─possible versions are: 0.5.3 or uninstalled
 └─restricted to versions 0.5.6-0.5 by UMAT [d4351ba0] — no versions left
   └─UMAT [d4351ba0] log:
     ├─possible versions are: 0.1.0 or uninstalled
     └─UMAT [d4351ba0] is fixed to version 0.1.0

Pull request #16 implements correct tovoigh and fromvoigh, unfortunately it will brake 2D support.

@jvaara please add Gurson cast iron UMAT Fortran source code to folder umat_models (you will need to create the folder as well). I will add the source building in the https://github.com/TeroFrondelius/umat_binaries_builder package.

Currently CALL ROTSIG is commented out in the build process TeroFrondelius/umat_binaries_builder@a48b1fa.

Dear all,

we may include "Strings Utility Module" for gurson_porous_plasticity.f90?

Warm regards.

There is a possible bug in the Gurson Fortran UMAT (or somewhere in the UMAT.jl), which causes Julia to crash on the Windows machine. This error that I happened to get might be related:

(UMAT) pkg> test UMAT
   Testing UMAT
 Resolving package versions...
 ** On entry to DGESV   parameter number  4 had an illegal value
ERROR: Package UMAT errored during testing

CC @jvaara