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rybask1
Posts: 22
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(@rybask1)
Eminent Member
Joined: 2 years ago

Hi all,

 

I am trying to create multiple load cases for the same impact simulation by combining different boundary conditions (thermal expansion, gravity, etc) in different permutations. I have created small loading systems to include in the main model, but I am having trouble getting the solution to recognize the included conditions.

Specifically, I have created a group of MAT_ADD_THERMAL_EXPANSION cards which reference PIDs in the main model, and I then add a Thermal Load Curve. However, the solution does not indicate any thermal expansion. 

 

Can anyone help me solve this?

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Negative Volume
Posts: 554
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(@negativevolume)
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Joined: 4 years ago

Hi @rybask1

I want to help you out however I can but I know nothing about thermal expansion simulation. 

Fundamentally, what do you think is the issue? That LS-Dyna is not recognizing the multiple *Mat_add_thermal_expansion cards?

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rybask1
Posts: 22
Topic starter
(@rybask1)
Eminent Member
Joined: 2 years ago

I believe the issue comes from the references within the smaller file. I have used part IDs which are not present in the small file (which has only the thermal expansion and thermal load curve), but it seems that when I include that small k file into the main file and solve, the reference to the PIDs are not recognized.

The small file contains no FEM parts, only material cards. I use the small file to reference Part IDs from the larger file- and include the small file into the larger simulation. No thermal expansion occurs in the main file, however. 

Sorry if this post is very redundant, I’m struggling to make this issue more clear.

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Negative Volume
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(@negativevolume)
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Posts: 554

@rybask1 I was thinking similar to @icebreakersours. Try saving the model as a single file (without include files) and run it and see if you are still having issues

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IceBreakerSours
Posts: 61
(@icebreakersours)
Trusted Member
Joined: 1 year ago

@rybask1 Do you see any errors/warnings in the D3HSP file?

Also, you may have already done it but, in case you haven't, try taking a step back and do the following - Make sure a single job file (no *INCLUDE) works as expected. If it does not, take another step back and try a simpler problem and then build from there.

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