Users:General FEM Analysis/Elements Reference/Cord 3D NURBS
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(Difference between revisions)
| Line 36: | Line 36: | ||
|AREA = ''float'' | |AREA = ''float'' | ||
|area of the cross section | |area of the cross section | ||
| + | |- | ||
| + | !CROSS SECTION | ||
| + | |AREA = ''float'' | ||
| + | |area of the cross section | ||
| + | |- | ||
| + | !PRESTRESS | ||
| + | |PRESTRESS = ''float'' | ||
| + | |prestress of the cable element | ||
|- | |- | ||
|colspan="3" style="background:#efefef;"| Optional Parameters | |colspan="3" style="background:#efefef;"| Optional Parameters | ||
| Line 46: | Line 54: | ||
|GAUSS_U = ''int'' | |GAUSS_U = ''int'' | ||
|Number of Gauss point per element. Must only to be defined when INT_TYPE_CORD_3D_NURBS = USER | |Number of Gauss point per element. Must only to be defined when INT_TYPE_CORD_3D_NURBS = USER | ||
| + | |- | ||
| + | !PRESTRESS_CURVE | ||
| + | |PRESTRESS_CURVE = ''int'' | ||
| + | |if the prestress of the cable element is linked to the load-curve, i.e. scaled by the load factor. The parameters 1 (yes) and 0 (no, Default) are valid. | ||
|- | |- | ||
|} | |} | ||
| Line 55: | Line 67: | ||
MAT= EL-MAT 1 | MAT= EL-MAT 1 | ||
AREA=1.0000e-001 | AREA=1.0000e-001 | ||
| − | + | PRESTRESS = 100 | |
| + | PRESTRESS_CURVE = 0 | ||
INT_TYPE_CORD_3D_NURBS = FULL | INT_TYPE_CORD_3D_NURBS = FULL | ||
!or: | !or: | ||
Revision as of 15:09, 5 December 2016
Contents |
General Description
Coded and testing is in progress.
Element Type
- This element provides a geometrically nonlinear, isogeometric spatial cable.
- Mass computation is implemented.
The formulation is stabilized by an additional bending stiffness based on Raknes et al.[1]. The bending stiffness is computed out of the area with the assumption of a circular cross section.
Degrees of Freedom
The element uses the translatoric degrees of freedom (Disp_X, Disp_Y, Disp_Z) at each control point.
Parameter Description
| Compulsory Parameters | ||
| Parameter | Values, Default(*) | Description |
|---|---|---|
| MAT | EL-MAT int | Linking to a material input block |
| INT_TYPE_CORD_3D_NURBS | FULL, USER | Control of integration type.
|
| CROSS SECTION | AREA = float | area of the cross section |
| CROSS SECTION | AREA = float | area of the cross section |
| PRESTRESS | PRESTRESS = float | prestress of the cable element |
| Optional Parameters | ||
| Parameter | Values, Default(*) | Description |
| GAUSS_U | GAUSS_U = int | Number of Gauss point per element. Must only to be defined when INT_TYPE_CORD_3D_NURBS = USER |
| PRESTRESS_CURVE | PRESTRESS_CURVE = int | if the prestress of the cable element is linked to the load-curve, i.e. scaled by the load factor. The parameters 1 (yes) and 0 (no, Default) are valid. |
Example of a Complete Input Block
EL-PROP 1 : CORD_3D_NURBS MAT= EL-MAT 1 AREA=1.0000e-001 PRESTRESS = 100 PRESTRESS_CURVE = 0 INT_TYPE_CORD_3D_NURBS = FULL !or: INT_TYPE_CORD_3D_NURBS = USER GAUSS_U = 3
Element Loading
The Cord_3D_NURBS element is able to carry the following loads:
- dead load
- snow load
- pressure load
- temperature load (not tested)
Benchmarks
Currently, no main benchmark file in the Carat++-repository is available.
References
- ↑ S.B. Raknes, X. Deng, Y. Bazilevs, D.J. Benson, K.M. Mathisen, T. Kvamsdal: „Isogeometric rotation-free bending-stabilized cables: Statics, dynamics, bending strips and coupling with shells“, in „Computer methods in applied mechanics and engineering“, Vol. 263, 2013, Seiten 127-143 http://dx.doi.org/10.1016/j.cma.2013.05.005
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