Users:General FEM Analysis/Elements Reference/NURBS BRep Edge coupling

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(Created page with "Coded and tested. Documentation will be coming soon! === Example of a Complete Input Block === <pre> EL-PROP 1 : NURBS_BREP_EDGE_COUPLING BREP_TYPE = COUPLING_DISP ! or: C...")
 
 
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Coded and tested.
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== General Description ==
  
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Documentation will be coming soon!  
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=== Element Type ===
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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>. The element allows to
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* coupling trimmed NURBS surfaces for geometrically linear and nonlinear analysis.
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=== Degrees of Freedom ===
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The element uses the translatoric degrees of freedom (''Disp_X'', ''Disp_Y'', ''Disp_Z'') at each control point.
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=== Parameter Description ===
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{| border="1" cellpadding="3" cellspacing="0"
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|colspan="3" style="background:#efefef;"| Compulsory Parameters
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|-
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!Parameter
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!Values, Default(*)
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!Description
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|-
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!INT_TYPE_NURBS_EDGE_COUPLING
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|FULL, USER
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|Control of integration type.
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* FULL: p+1 Gauss points are used (p = polynomial degree of the NURBS patch)
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* USER: the optional Parameter GAUSS_U defines the number of Gauss points
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|-
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|-
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!BREP_TYPE
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|COUPLING_DISP, COUPLING_ROT, COUPLING_DISP_ROT
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|Type of coupling.
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* COUPLING_DISP: only displacements are coupled
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* COUPLING_ROT: only rotations are coupled
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* COUPLING_DISP_ROT: displacements and rotations are coupled
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|-
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!BL_FACTOR_DISP
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|BL_FACTOR_DISP= ''float''
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|penalty factor for the displacement
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|-
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!BL_FACTOR_ROT
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|BL_FACTOR_ROT= ''float''
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|penalty factor for the rotation
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|-
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|colspan="3" style="background:#efefef;"| Optional Parameters
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|-
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!Parameter
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!Values, Default(*)
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!Description
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|-
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!GAUSS_U
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|GAUSS_U = ''int''
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|Number of Gauss point per element. Must only to be defined when INT_TYPE_CORD_3D_NURBS = USER
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|-
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|}
  
 
=== Example of a Complete Input Block ===
 
=== Example of a Complete Input Block ===
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   GAUSS_U = 4
 
   GAUSS_U = 4
 
</pre>
 
</pre>
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== Element Loading ==
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The NURBS_BRep_Edge_Cord element is able to carry the following loads:
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* dead load
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* snow load
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* pressure load
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* temperature load (not tested)
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== Benchmarks ==
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The main benchmark file in the ''Carat++''-repository (cmake option ''extensive benchmarks'' is
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* '../examples/benchmark_examples/isogeometric/x_ibra_oilsump_8mm/xcbm_oilsump_8mm.txt'.
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== References ==
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<references/>

Latest revision as of 09:12, 9 December 2016

Contents

General Description

Element Type

The formulation is based on Breitenberger et al. [1]. The element allows to

  • coupling trimmed NURBS surfaces for geometrically linear and nonlinear analysis.


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.
  • 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
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= 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 (cmake option extensive benchmarks is

  • '../examples/benchmark_examples/isogeometric/x_ibra_oilsump_8mm/xcbm_oilsump_8mm.txt'.

References

  1. ↑ 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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