2D Meshing

[jaydeshpande]

Hello Mr. Carlsson,

I tried the new version of neper (neutral), following are the things that I noticed while using neper for 2D case.

1. Creating Tessellations : neper -T -n 100 -id 1 -dim 2 -reg 1 -filter size
2. Creating Mesh : neper -M n100-id1.tess -dim 1,2 -format 'inp' -faset 'faces' while creating Mesh -nset all command doesn't work, it stops the code.

I followed similar procedure for 3D and it works fine, it doesn't seem to work properly for 2D case. Could you tell possible cause for the error? Or as I read in another reported issue, it doesn't support 2D yet?

Thanks, Jaydeep

[KristofferC]

cohesive elements for 2D is supported but making them have a finite thickness is not yet.

Did you remember to put the correct mesh dimension for the method like this:

create_cohesive_elements(self.mesh, 2)

If it still does not work, could you give a link to the .inp file you get from neper?

[jaydeshpande]

Thanks for the reply, I tried varying the mesh size, still I'm getting the same error: 73 grain_id_1 = grains_connected_to_face[0] 74 grain_id_2 = grains_connected_to_face[1]

Link to inp file: https://drive.google.com/file/d/0B3gnGWlJ1s80amkyUTNZdExLYkk/view?usp=sharing

I know something is wrong with -nset or creating the proper sets of adjacent grains. I am not able to figure out where it is going wrong.

Thanks, Jaydeep

[KristofferC]

I used your .inp file and it seems to work for me:

This is the exact commands I am using:

from phon.io.read.read_from_neper_inp import read_from_neper_inp
from phon.io.write.export_to_abaqus import export_to_abaqus
from phon.mesh_tools.create_cohesive_elements import create_cohesive_elements

inputfile = "n100-id1.inp"
mesh = read_from_neper_inp(inputfile, verbose=0)
create_cohesive_elements(mesh, 2)
export_to_abaqus("n100-id1_coh.inp", mesh, write_2d_elements=True)

If you do that, does it work? Do you have newest Phon?

[jaydeshpande]

Thank you so much Mr. Carlsson, it works. I was not using the other arguments from export_to_abaqus. Thank you for prompt replies and the support. I thank you once again for developing and making the tool open source.

[KristofferC]

I am glad it worked.

The write_2d_elements argument to export_to_abaqus is a bit weird. It is mostly a leftover from when I started writing Phon and it was only used for 3D.

I will try think of a way for situations like this to not happen again. Maybe give an error message when 0 elements are written by export_to_abaqus or something.

[Shahriortsr]

Hi, I am trying to visualize the deformed grain. Is there any way that I can visualize it from the abaqus odb file? I used neper to visualize the undeformed grains while creating the inp file. Thanks and sorry to interrupt in this discussion.

[swapz01]

Is it possible to make a quad mesh in 2d cell grain wise nonuniformly? PFA for reference can u give me the commands to generate such a mesh. Thank you.