Hi,
There is a good option to call UMAT in shared libraries. It does not require any modification to CalculiX, is generally easier to set up and is very flexible. I wonder if this functionality can be used for the other subroutines like “dload.f”.
Let’s assume that it is going to define hydrostatic pressure loading on a structure. In this case, it is needed to build Calculix from the source!
I believe this is only available for the umats, not for any other user subroutine. You might be able to hack a similar mechanism for the dload as the umats, but you will need to look into the source code.
i guessed only in material is possible,
Yes, you are right.
It will be helpful if there is a similar mechanism for other subroutines.
Is there any place to request that feature?
You can email Guido directly to see if this is something he might be interested in doing. I doubt it would take priority over bug fixes and other features.
Hi again,
I managed to call dload subroutine from a DLL file on Windows. I share my experience here.
First, I changed the dload.f in the src directory as shown in the following figure:
The “dload.f” calls a new subroutine “ext_dload” that is a DLL warper defined in a new source code called “ext_dload.c” as:
For building the ccx, it is needed to add “ext_dload.c” at the end of the build chain in “Makefile.inc”:
Here is an example of a user-defined load defined in a fortran code, MY_DLOAD.F:
Using MinGW to compile it into a DLL file: gfortran -shared -o MY_DLOAD.DLL MY_DLOAD.F and move the MY_DLOAD.DLL into the directory that contains “ccx.exe”.
Finally, it can be called in the input file as:
*dload
Internal-1_Surface-1_S6,P4NU@MY_DLOAD,1.0
The built can be found through the following link:
