body centred cubic creation

Altair Forum User

Hi, 

 

I have a structure made of 3d solid map hex mesh elements, ie. primitive unit cells (see primitive image attached). I have turned my hex mesh elements into bar2 elements. I would like to create a central node to the primitive unit cell and connect bar elements to this central node (see body centred cubic image). I know this will most likely be a TCL script problem but I'm not sure how the script would be written.

 

I have successfully created the primitive unit cell and used config edit tool to create bar2 elements (CBEAM's) But I would now like to do this with elements connected to a central node.

 

A comparison of what I'm attempting to do can be seen in this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265793/pdf/materials-11-02073.pdf

 

I look forward to hearing from the community,

 

Kind Regards,

 

Laurence

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Altair Forum User

Hi, 

 

I have a structure made of 3d solid map hex mesh elements, ie. primitive unit cells (see image attached). I have turned my hex mesh elements into bar2 elements. I would like to create a central node to the primitive unit cell and connect bar elements to this central node (see image attached). I know this will most likely be a TCL script problem but I'm not sure how the script would be written.

 

I have successfully created the primitive unit cell and used config edit tool to create bar2 elements (CBEAM's) But I would now like to do this with elements connected to a central node.

 

A comparison of what I'm attempting to do can be seen in this paper: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6265793/pdf/materials-11-02073.pdf

 

I look forward to hearing from the community,

 

Kind Regards,

 

Laurence

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tinh

Seem that I wrote a script to do this?

imoto

Hello @LFM1995

 

You can use *createbestcirclecenternode API.

 

Example:

*createmarkpanel nodes 1 'Select nodes';
*createbestcirclecenternode nodes 1 0 1 0;
 

Thanks,

Imoto

Altair Forum User

Altair Forum User said:

Hello @LFM1995

 

You can use *createbestcirclecenternode API.

 

Example:

*createmarkpanel nodes 1 'Select nodes';
*createbestcirclecenternode nodes 1 0 1 0;
 

Thanks,

Imoto

Hi Imoto,

 

Yes, this allows me to create a center node, which is part of the solution. How do I now create a central node for each quad element, as well as creating lines that connect to this central node from all 8 edges?

 

Thanks,

 

Laurence

Unable to find an attachment - read this blog

imoto

Hello @LFM1995

 

If you still have the hexa elements, please try this.

 

hm_entityrecorder elems on;
*createmark elems 1 'by config' 208;
foreach elemid [hm_getmark elems 1] {
 lassign [hm_entityinfo centroid elems $elemid] X Y Z;
 *createnode $X $Y $Z;
 set center [hm_latestentityid nodes];
 foreach nodeid [hm_getvalue elems id=$elemid dataname=nodes] {
  *createlist nodes 1 $center $nodeid;
  *createelement 2 1 1 1;
 }
}
hm_entityrecorder elems off;
set newplot [hm_entityrecorder elems ids];

if {[llength $newplot] != '0'} {
 hm_createmark elems 1 $newplot;
 *configedit 1 'bar2';
}
hm_markclearall 1;

 

Download --->>>

Unable to find an attachment - read this blog

imoto

Hi @LFM1995

 

You have one more option.
If you are using OptiStruct, you can change the Lattice type from DTPL card.

 

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<?xml version="1.0" encoding="UTF-8"?>

Altair Forum User

Hi Imoto,

 

Thanks for the script! That's exactly what I was looking for.

 

Kind Regards,

 

Laurence

Vlad VB

Altair Forum User said:

Seem that I wrote a script to do this?

can you share the script? I can't find it. Thank you 

tinh

Altair Forum User said:

can you share the script? I can't find it. Thank you 

Sorry, i remember that i wrote it in a post but for a long time...