tet10 mesh in LS-Dyna

Altair Forum User

Hi

 

I mesh my geometry with hypermesh and use LS-dyna as a FE solver.

When I created tet10 mesh in hypermesh and looked at the element summary, it said

 

' TETRA10 ELEMENTS NOT SUPPORTED in LS-DYNA template.

  These elements will not be exported.'

 

I would like to confirm that if I need to export tet4 mesh and convert them into tet10 in LS-prepost.

Does anyone know about the problem?

 

I would appreciate any help.

Thanks,

 

Jay

 

Altair Forum User

Hi,

 

i think LSDyna can't read TET10 elements. Normaly you never use elements of second order (for explicit solution).

 

In LSDyna there is no direct *ELEMENT_SOLID for Tetra 10 elements. Instead there is a option: *ELEMENT_SOLID_TET4TOTET10, which generate TET10 from TET4 elements.

This is also supported from Hypermesh. (Card Editor->Options)

 

Regards,

Mario

Altair Forum User

Yeap, we never use TET10 (or second order in general) for LS-DYNA.

.

Altair Forum User

Is there a particular reason why I cannot use 2nd order elements?

I saw some papers that used 2nd order elements for impact simulations with different FE solvers.

 

Is it just LS-DYNA problem?

Altair Forum User

Hi,

 

it is a question of the solution type. Since 'crash' solver are using explicit time integration schemes, they are dependent on simple and fast element descriptions (that the reason for using under integrated elements, instead of fully (sometime used) or second order).

 

Please inform yourself on the internet about the differences of explicit vs implicit solutions. It's too much and too difficult to perform all here.

 

Regards,

Mario

Altair Forum User

Could anyone help me how to use TET4TOTET10 card in HM?

I tried to find it, but I cannot.

 

I would appreciate any help.

 

Thanks,

 

Jay

Altair Forum User

Hi,

 

it's written in my former post.

You can change it in Card Editor->element->options (triangle)->TET4TOTET10

 

Regards,

Mario