Users:General FEM Analysis/Elements Reference/NURBS BRep Edge coupling
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Contents |
General Description
Example of a Complete Input Block
EL-PROP 1 : NURBS_BREP_EDGE_COUPLING BREP_TYPE = COUPLING_DISP ! or: COUPLING_ROT, COUPLING_DISP_ROT !NITSCHE=AUTO BL_FACTOR_DISP = 10000 BL_FACTOR_DISP = 10000 INT_TYPE_NURBS_EDGE_COUPLING = USER or FULL GAUSS_U = 4
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 |
| 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 |
Example of a Complete Input Block
EL-PROP 1 : NURBS_BREP_CHORD MAT= EL-MAT 1 AREA = 1 PRESTRESS = 4000 INT_TYPE_NURBS_BREP_CHORD = USER or FULL GAUSS_U = 4
Element Loading
The NURBS_BRep_Edge_Cord element is able to carry the following loads:
- dead load
- snow load
- pressure load
- temperature load (not tested)
Benchmarks
The main benchmark file in the Carat++-repository is
- '../examples/benchmark_examples/isogeometric/iga_formfinding_4point_with_trusses/cbm_4PointSailwTrusses.txt'.
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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