Users:General FEM Analysis/Elements Reference/NURBS BRep Edge coupling
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== General Description == | == General Description == | ||
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=== Element Type === | === Element Type === | ||
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* FULL: p+1 Gauss points are used (p = polynomial degree of the NURBS patch) | * FULL: p+1 Gauss points are used (p = polynomial degree of the NURBS patch) | ||
* USER: the optional Parameter GAUSS_U defines the number of Gauss points | * USER: the optional Parameter GAUSS_U defines the number of Gauss points | ||
| + | |- | ||
| + | |- | ||
| + | !BREP_TYPE | ||
| + | |COUPLING_DISP, COUPLING_ROT, COUPLING_DISP_ROT | ||
| + | |Type of coupling. | ||
| + | * COUPLING_DISP: only displacements are coupled | ||
| + | * COUPLING_ROT: only rotations are coupled | ||
| + | * COUPLING_DISP_ROT: displacements and rotations are coupled | ||
|- | |- | ||
!BL_FACTOR_DISP | !BL_FACTOR_DISP | ||
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=== Example of a Complete Input Block === | === Example of a Complete Input Block === | ||
<pre> | <pre> | ||
| − | EL-PROP 1 : | + | 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 | GAUSS_U = 4 | ||
</pre> | </pre> | ||
Revision as of 09:09, 9 December 2016
Contents |
General Description
Element Type
- This element allows to coupling trimmed NURBS surfaces for geometrically linear and nonlinear analysis.
The formulation is based on Breitenberger et al. [1].
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 |
|---|---|---|
| INT_TYPE_NURBS_EDGE_COUPLING | FULL, USER | Control of integration type.
|
| BREP_TYPE | COUPLING_DISP, COUPLING_ROT, COUPLING_DISP_ROT | Type of coupling.
|
| BL_FACTOR_DISP | BL_FACTOR_DISP= float | penalty factor for the displacement |
| BL_FACTOR_ROT | BL_FACTOR_ROT= float | penalty factor for the rotation |
| 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_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 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
- ↑ Breitenberger, M.; Apostolatos, A.; Philipp, B.; Wüchner, R.; Bletzinger, K.-U.: Analysis in computer aided design: Nonlinear isogeometric B-Rep analysis of shell structures. Computer Methods in Applied Mechanics and Engineering 284, 2015, 401--457
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