Users:General FEM Analysis/Elements Reference/Cord 3D NURBS

From Carat++ Public Wiki
< Users:General FEM Analysis | Elements Reference(Difference between revisions)
Jump to: navigation, search
(Created page with "Coded and tested. Documentation will be coming soon! === Example of a Complete Input Block === <pre> EL-PROP 1 : CORD_3D_NURBS MAT= EL-MAT 1 AREA=1.0000e-001 INT_TY...")
 
(→Parameter Description)
 
(3 intermediate revisions by one user not shown)
Line 1: Line 1:
−
Coded and tested.
+
== General Description ==
  
−
Documentation will be coming soon!  
+
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.<ref>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</ref>. 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 ===
 +
 
 +
{| border="1" cellpadding="3" cellspacing="0"
 +
|colspan="3" style="background:#efefef;"| 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.
 +
* 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
 +
|-
 +
!CROSS SECTION
 +
|AREA = ''float''
 +
|area of the cross section
 +
|-
 +
!PRESTRESS
 +
|PRESTRESS = ''float''
 +
|prestress of the cable element
 +
|-
 +
|colspan="3" style="background:#efefef;"| 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 global load factor. The parameters 1 (yes) and 0 (no, Default) are valid.
 +
|-
 +
|}
  
 
=== Example of a Complete Input Block ===
 
=== Example of a Complete Input Block ===
Line 8: Line 62:
 
   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:
Line 14: Line 69:
 
   GAUSS_U = 3
 
   GAUSS_U = 3
 
</pre>
 
</pre>
 +
 +
== 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 ==
 +
 +
<references/>

Latest revision as of 15:57, 10 July 2017

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.
  • 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
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 global 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

  1. ↑ 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




Whos here now:   Members 0   Guests 0   Bots & Crawlers 1
 
Retrieved from "http://carat.st.bv.tum.de/caratuserswiki/index.php/Users:General_FEM_Analysis/Elements_Reference/Cord_3D_NURBS"
Personal tools
Content for Users
Content for Developers