TIME STEP LESS OR EQUAL DT MIN FOR SOLID ELEMENTS
Altair EmployeeHi everybody,
I'm trying to simulate an head/glass impact.
My intention is to compare the 2D model results with the 3D model ones.
For the 2D model I've used the property P11_SAND with a M27_PLAS_BRIT material and a FAIL_FLD failure mode, and it seems to work.
But I have some problems with the solid model:
- M27 is not compatible with solid elements, so i've used M24_CONC
- FAIL_FLD in not compatible with M24, so i've used FAIL_TBUTCH
No errors or warnings occur during the starter running, but when the simulation starts there are a lot of errors
TIME STEP LESS OF EQUAL DT MIN FOR SOLID ELEMENTS.
I've seen in the forum that it could be an error in the model, but I can't find it.
Someone can help me to find the problem and fix it?
I've uploaded the output files
Kind regards,
Alessio
Answers
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if i were you, i would try to test model without load at first.
then try to use control timestep.
i think elements are much small
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HI,
Looks like the problem is coming from material formulation,
Can you please share the model files?
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Hi Prakash,
I've sent you the model file you required.
thank you
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Thank you.
I will check and get back to you soon,
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Hi Prakash,
have you any new?
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Yeah, this is coming from the material.
But output shows as solid elements. I am trying different things at my end to get a compatibility.
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Hi Prakash,
have you solved the problem?
Thank you
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I am checking with experts on this. I will share details as soon as I get a feedback from them
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Your material data seem to be not very well. It can lead to not so robust results. Try first with LAW2 or LAW27.
Use DT/NODA/CST with 0.67 for scaling and 1e-6 for min timestep,
Change the Istiff on contact card to 4 and run the analysis.
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