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May 31, 2024 at 7:37 amMarco PedataSubscriber
Hello community,
this is my first time trying to set up a Ls-Dyna Restart simulation. I tried different methods but each seem to come with their own difficulties.
I would greatly appreciate solution approaches.
First Option: Export dynain file and import via external model into new Ls-Dyna system
Advantages: Import deformed mesh and initial stresses.
Issues: Weird artifacts - perhaps due to initial penetration of contacts.
I tried to check for and handle this with a keyword snippet:
*CONTROL_CONTACT
$#  slsfac   rwpnal  islchk  shlthk  penopt  thkchg  orien   enmass
   0.0    0.0    0     1     1     0     2     0
$# Â usrstr
   0
$# Â sfric
   0.0
$#  ignore   frceng  skiprwg  outseg  spotstp  spotdel  spothin
   0     1     0     1     0     1     0.5
*END
Second Option: Ls-Dyna Restart systems in Workbench
Advantages: Easy to understand
Disadvantages: Limited features-especially full restart
I started with a small restart to delete parts that are not needed for the restart(the full restart does not seem to support that). I tried keyword snippets to delete those parts in the full restart but even though no error appeard the parts continued to exist.
With the small restart before the full restart, I can delete those parts. However the full restart only works when connected to the original Ls-Dyna system and not when connected to the small restart.First Option: Export dynain file and import via external model into static structural
Advantages: No weird artifacts
Issues: The initial stress state is imported but based on the stresses at time 0, the stresses are not applied.
best regards,
Marco -
June 3, 2024 at 8:02 amMarco PedataSubscriber
In addition to my first post:
I tried to solve the problem via an explicit dynamics system.
Advantages: Multiple Loadsteps possible
Disadvantages: No Deletion of parts possible?
I defined the same model in explicit dynamics that i tried to solve via multiple Ls-Dyna systems because Ls-Dyna does not support multiple load steps.
When it came to Deleting parts for the second load step, however, I noticed no implemented feature.
Therefore, I wrote a command snippet to delete the bodies:
/PREP7
KDELE,62905
KDELE,62907
FINISH
I got an error, but do not know why.
Any assistance would be greatly appreciated!
Best regards,
Marco
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