Tetrahedron Elements - Isolid - Itetra

Altair Forum User

Hi all,

 

I saw that in v14 a new solid property option has been introduced : Itetra, a 4-node tetrahedron formulation flag. I set it to 1.

 

My Isolid is 17, not supported for tetras, so it goes back to default : 1 (= Standard 8-node solid element, one integration point); Which to me already seems strange as it is for 8-node elements... But does it even take into account my Itetra ? 

 

My question is: 

Isolid says 1 integration point

Itetra says 4 integration points.

 

Which one is taken into account here ? 

 

Thank you in advance,

Alice

Altair Forum User

Hi Alice,

For tetra elements choose tetra element formulation, Itetra and Isolid is not used for tetra elements. 

Altair Forum User

Hello George,

 

I did not know this exists. How is it called ? Is that a property ?

 

Thank you very much for your reply.

Altair Forum User

Hi Alice,

Similar to Isolid, which is to choose hex element formulation, with Itetra option user can select the tetra element formulation. 

Altair Forum User

Hi George,

 

Ok so this is what I did. 

So if I indicate Isolid = 17 (or other) it will not take it into account, rihgt ? 

 

But I get warnings because of this Isolid = 17 ... if I put it to 0 it will take 1, which I don't want either. I juste want it not to take into account Isolid, but Itetra, which I thought it would do...

Can you explain please ? 

Altair Forum User

Hi Alice,

Please leave the Isolid flag option. Instead of choosing any formulation for Isolid you can choose OFF so that it will not be taken into account.

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Altair Forum User

ok. Thank you for this exaplanation.