ut4-solid¶
Module: solid
Category: soliddomain
Type string: "ut4-solid"
Parameters¶
| Name | Description | Default | Units |
|---|---|---|---|
alpha |
alpha | 0.05 | [] |
iso_stab |
iso_stab | false | [] |
mat_axis |
[] |
Description¶
The ut4-solid is a special formulation for tetrahedral elements that uses a nodally-averaged integration rule, as proposed by Gee et al. 1. This formulation requires additional parameters.
The alpha parameter defines the amount of "blending" between the regular tet-contribution and the nodally integrated contribution. The value must be between 0 and 1, where 0 means no contribution from the regular tet and 1 means no contribution from the nodally averaged tet. The iso_stab parameter is a flag that chooses between two slightly different formulations of the nodally integrated tet. When set to 0, the stabilization is applied to the entire virtual work, whereas when set to 1 the stabilization is applied only to the isochoric part. See the FEBio Theory Manual for a detailed description of this formulation.
<SolidDomain name="Part1" type="ut4-solid" mat="material1">
<alpha>0.05</alpha>
<iso_stab>0</iso_stab>
</SolidDomain>
-
Gee, M.W., Dohrmann, C.R., Key, S.W., and Wall, W.A., "A uniform nodal strain tetrahedron with isochoric stabilization", Int. J. Numer. Meth. Engng (2009), pp. 429-443. ↩