How to create 3d geometry for penetration problem ?

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oyh48@hotmail.com
Posts: 5
Joined: Mon Sep 18, 2023 2:58 am

How to create 3d geometry for penetration problem ?

Post by oyh48@hotmail.com »

Dear sir,

I wish to model penetration of 2 inclusions in soil. The sub soil is divided into 2 layers (18m and 3m). Above the ground surface are 2 inclusions. The diameter of inclusion is 0.4 m, length is 18m, tip is 60 degree cone shape, 1.05m apart. The tip of the cone is coincide with the group surface. Top of the domain is 1 m above top of inclusion, ie 19m - 18m. I wish to know how to model this in GiD ? I am worry about the coincidence or intersection of the tip of the cone to the ground surface. How to model this ? Please help.

I have created the 3d geometry in Midas GTS nx. I exported to parasolid but GiD said older version is required. Any chance of importing the newer version of parasolid file ?

Thank you.

Regards,

ong
Attachments
parasolid old version.jpg
parasolid old version.jpg (23.05 KiB) Viewed 8129 times
top.jpg
top.jpg (22.23 KiB) Viewed 8129 times
front view.jpg
front view.jpg (27.76 KiB) Viewed 8129 times
User avatar
escolano
Posts: 1924
Joined: Sun Sep 05, 1982 10:51 pm

Re: How to create 3d geometry for penetration problem ?

Post by escolano »

Please, attach the Parasolid file with the model,
and also find inside the Midas GTS nx folders if there is a file named like
sch_34001.sch_txt
(or something similar *_34001* )
This file is the schema the describes the data in the Parasolid format of this version,
to try to identify the changes vs previous versions and be able to be read in next GiDs

In any case the geometry of your picture seems simple to be created directly in GiD, a couple of lines revolved to create the inclusion, and a box holed with this volume.
You can follow some tutorials of the 'GiD user manual' to start leaning.
https://gidsimulation.atlassian.net/wik ... M/overview
(Html help is also installed with GiD)
oyh48@hotmail.com
Posts: 5
Joined: Mon Sep 18, 2023 2:58 am

Re: How to create 3d geometry for penetration problem ?

Post by oyh48@hotmail.com »

Dear escolano,

These are only two files in the folder.
2 pile group.gts
2 pile group.X_B

There is no sch_34001.sch_txt file in gts folder.
ong
oyh48@hotmail.com
Posts: 5
Joined: Mon Sep 18, 2023 2:58 am

Re: How to create 3d geometry for penetration problem ?

Post by oyh48@hotmail.com »

Dear escolano,

I keyed in points of a cone in 3D. Then i drew surface of the cone. Then, i create volume using copy>rotate function. Then, I copied the volume of cone to put it 1 meter on the right of the first cone. Then, I keyed in points of four corners of a plane where the z of the plane is coincident with the tip of the cone. I then create surface of the plane and z=0. Then, I extrude up 6 m to create box volume. Then, i do the same for z=-6 m to simulate soil.

But when i mesh the two cones and the box, the mesh of the cone do not connected with the box. Is there any function to connect the tip to the box, like auto-connect in Midas GTS ?
mesh not connected.jpg
mesh not connected.jpg (714.02 KiB) Viewed 8103 times
This is my file.

https://drive.google.com/file/d/1jQMh4e ... sp=sharing

Please help me.

Thank you.

ong
User avatar
escolano
Posts: 1924
Joined: Sun Sep 05, 1982 10:51 pm

Re: How to create 3d geometry for penetration problem ?

Post by escolano »

Your model has 2 volumes and in the middle a volume the surfaces of piles.
delete the surface of the piles that seems that you used for the revolution, to have only the boundary surfaces.
then can create a volume for each pile
and then can hole the volume of the soil (Geomtry->Edit->Hole volume) with the two previous pile volumes
then these volumes are deleted and are created as holes of the first volume.

then to generate the volume mesh theres is a problem because the apex of the pile is touching the boundary of the volume, and a hole must be inside the volume, not touching the boundary (otherwise won't be space in the middle to be filled with tetrahedra).
to overcome this problem I simply joined the two soil volumes in a single volume (Geometry->Edit->Join->Volumes)
Then is possible to generate the mesh of the soil you want, of a solid holed with the shape of two piles.
I attach my model
Cone 3a_1.gid.zip
(1.86 KiB) Downloaded 352 times
User avatar
escolano
Posts: 1924
Joined: Sun Sep 05, 1982 10:51 pm

Re: How to create 3d geometry for penetration problem ?

Post by escolano »

Please, send me the file "2 pile group.X_B"
It is the Parasolid binary format v 34001 of your example
To try to implementing the parasolid version changes in future GiD importer.
User avatar
escolano
Posts: 1924
Joined: Sun Sep 05, 1982 10:51 pm

Re: How to create 3d geometry for penetration problem ?

Post by escolano »

If do you really need two soil volumes instead one (e.g. to assign different material properties), and the division surface is exactly on the apex point, then is necessary to create the divisory surfaces with this point in its boundary, like this image:
divisory_surfaces_using_apex_point.png
divisory_surfaces_using_apex_point.png (14.28 KiB) Viewed 8092 times
I attach this second GiD model
Cone 3a_2.gid.zip
(2.26 KiB) Downloaded 368 times
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