Hi,
I am a new user to DAMASK SOFTWARE. i have installed DAMASK and Neper software in Linux platform in order to perform a crystal plasticity (CP) analysis (rolling processing) using these two software. I have developed a 3D model using Neper software. Now i have to export this file into DAMASK software and need to introduce all the crystal plasticity parameters using DAMASK software ，but it failed and i am not familiar with DAMASK SOFTWARE. Can anyone guide or could share any reference material/ videos so that it can be a good guidance to perform the CP analysis?
Thank you in advance.
YeYuan
Hello YeYuan,
If you just want to perform a simple CP simulation, you might want to use FEPX instead of DAMASK. FEPX is a CP FEA software companion for Neper, here you have a good tutorial on it: https://www.youtube.com/watch?v=X44eUOxYQYc
However, DAMASK is also a very good software and they have good support if you have any query. Which one you want you use may depend on your needs. For Damask tutorials, I would mainly refer to their website.
Nonetheless, from my experience, Neper RVEs are a bit easier to implement in FEPX.
Hello Yuan,
I am not sure, I have limited my studies to low temperature applications using their constitutive equations. I would refer to their documentation: https://fepx.info/features.html
Hello Yuan,
Can you please explain how to load VTK geometry files from Neper to DAMASK_grid simulation? I am using damask.Grid.load_Neper to load the grid information, but getting an AttributeError ('NoneType' object has no attribute 'GetDimensions'). I have attached the vtk file that I am trying to load. Thank you!
Solution update (Aug 2022):
I have used the following steps to import the mesh from NEPER to DAMASK_Grid:
•Produce grid vti file from DAMASK module in Jupyter (damask.Grid.from_Voronoi_tessellation)
•Save the vti as vtk file using paraview (ASCI format)
•Resize the vtk grid file (origin, spacing and dimension)
•Edit/copy the material IDs (as FIELD data) from neper vtk file (CELL data)
•Load the edited vtk file using DAMASK module in Jupyter (damask.Grid.load_Neper) and export as vti
•Use the new vti file as Damask_grid input
Hopefully, it helps! Thank you!!
Venkatesh Ananchaperumal
could you share me the detailed steps to bulit .vti file and materials.yaml from the grid information based on neper software?
I am wondering if you could kindly share me the method (may be the source code) and the necessary information about it. I promise they will be used only for research purposesThank you very much for your kind consideration and I am looking forward to your early reply.
my email:[email protected]
Hello Yuan Ye ,
Thank you for the response.
Can you please share the set of commands you used to produce geometry files from Neper that you can use in DAMASK_Grid?
Did you use just like "DAMASK_grid -l load_file.yaml -g Neper_mesh.vtk"?
I produced UNSTRUCTURED_GRID vtk mesh form Neper, and when used with DAMASK_Grid, it says 'invalid VTI file; material data not found.' Any leads would be appreciated. Thank you very much.
Neper has the ability to provide structured grids which are suitable for the grid solver. A series of example commands is
import damask
N_grains = 20
cells = (32,32,32)
damask.util.run(f'neper -T -n {N_grains} -tesrsize {cells[0]}:{cells[1]}:{cells[2]} -periodicity all -format vtk')
damask.Grid.load_Neper(f'n{N_grains}-id1.vtk')
Martin Diehl ，hello Hello Dr. Martin Diehl, I am a beginner in Damask and I have encountered some issues that I would like to ask for your guidance on. Specifically, when I use non-local constitutive models in Damask, setting the non-local constitutive parameter "short_range_stress_correction" to "true" results in Damask 3.0 being unable to run the simulation and displaying an error message stating "ERROR STOP invalid error number". I would like to know the possible reasons for this situation. Thank you for your assistance.
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