Users:General FEM Analysis/Elements Reference/NURBS BRep Edge coupling
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(Difference between revisions)
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=== Element Type === | === Element Type === | ||
| − | * This element | + | * This element allows to coupling trimmed NURBS surfaces for geometrically linear and nonlinear analysis. |
| − | + | ||
| − | The formulation is | + | The formulation is based on Breitenberger et al. <ref>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</ref>. |
=== Degrees of Freedom === | === Degrees of Freedom === | ||
| Line 31: | Line 30: | ||
!Values, Default(*) | !Values, Default(*) | ||
!Description | !Description | ||
| − | + | !INT_TYPE_NURBS_EDGE_COUPLING | |
| − | ! | + | |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
|FULL, USER | |FULL, USER | ||
|Control of integration type. | |Control of integration type. | ||
* 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 | ||
| + | !BL_FACTOR_DISP | ||
| + | |BL_FACTOR_DISP= ''float'' | ||
| + | |penalty factor for the displacement | ||
|- | |- | ||
| − | ! | + | !BL_FACTOR_ROT |
| − | | | + | |BL_FACTOR_ROT= ''float'' |
| − | | | + | |penalty factor for the rotation |
| − | + | ||
| − | + | ||
| − | + | ||
| − | + | ||
|- | |- | ||
|colspan="3" style="background:#efefef;"| Optional Parameters | |colspan="3" style="background:#efefef;"| Optional Parameters | ||
Revision as of 08:48, 9 December 2016
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 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.
|
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_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
- ↑ 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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