LS-DYNA hex element

[EvanD]

Does LS-DYNA support 20 noded hexahedral elements?

Running the exact same simulation with linear (8 noded bricks) works fine, but after giving the elements midside nodes, the all quadratic bricks essentially are ignored by LS-DYNA even though they exist in the input file (IE the part with the 20 noded hex doesn't exist at all in the sim).

I'm using the explicit Central difference method as the solver with ELFORM =1 (Constant Stress elements).

Any help with this would be greatly appreciated!

 

[jcac]

As far as I am aware LS-DYNA only supports 8 node hex elements (as of version 970 anyway). The constant stress hex element is an 8 node under-integrated element. Looking at the *SECTION_SOLID entry in the manual there is a quadratic element, the higher order is achieved through including nodal rotations in the formulation so it is still a 8 node lement.

I should add that I have only ever used the ELFORM 1 hex element.