CQAXI

Bulk Data Entry Defines an axisymmetric quadrilateral cross-section ring element.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CQAXI EID PID G1 G2 G3 G4 G5 G6  
  G7 G8 Theta            

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CQAXI 111 2 31 74 75 32 51 52  
  63 62 15.0            

Definitions

Field Contents SI Unit Example
EID Unique element identification number.

No default (Integer > 0)

  
PID A PAXI entry identification number.

Default = EID (Integer > 0)

  
GI Identification numbers of connected corner grid points.

Corner grid points cannot be omitted.

No default (Integers > 0, all unique)

  
Theta Material orientation angle in degrees.

Default = 0.0 (Real)

  

Comments

  1. Element identification numbers must be unique with respect to all other element identification numbers.
  2. The element grids numbering scheme is controlled by SYSSETTING,AXEGORD,0/1.
    SYSSETTING,AXEGORD Corner Grid Points Edge Grid Points
    C C C C E E E E
    0 (default) G1 G3 G5 G7 G2 G4 G6 G8
    1 G1 G2 G3 G4 G5 G6 G7 G8
  3. All the grid points must be in the x-y plane or in the x-z plane of the basic coordinate system with x = r ≥ 0.

    Corner grid points C, C, C and C must be present. The edge points E, E, E and E are optional. If any of the edge points are present, they all must be used.

    Note that this information is consistent only for the default SYSSETTING,AXEGORD,0. If this is switched to 1, then the corresponding grid point references should be interpreted accordingly.



    Figure 1. CQAXI Definition
  4. The continuation line is optional.
  5. If the PAXI entry referenced in field 3 references a MAT3 entry, material properties and stresses are always given in the (xm, zm) coordinate system shown in Figure 1.
  6. A concentrated load (for example, the load specified on a FORCE entry) at a grid Gi of this element denotes that applied onto the circumference with radius of Gi. For example, in order to apply a load of 200N/m on the circumference at Gi which is located at a radius of 0.4m, the magnitude of the load specified on the static load entry must be:(1)
    ( 200   N / m ) * 2 π * ( 0.4 m ) = 502.655 N
  7. Axisymmetric elements are supported for linear analysis, small and large displacement nonlinear static analysis. Currently, axisymmetric elements are not supported for inertia relief analysis in large displacement nonlinear analysis.