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


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)


(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CTRIAX6 111 203 31 74 75 32 51 52


Field Contents SI Unit Example
EID Unique element identification number.

No default (Integer > 0)

MID Identification number of a MAT1, MAT3 or MATHE entry.

No default (Integer > 0)

G1, G3, G5 Identification numbers of connected corner grid points. Cannot be omitted.

No default (Integers > 0, all unique)

G2, G4, G6 Optional: Identification numbers of connected edge grid points.

No default (Integers > 0, all unique)

Theta Material orientation angle in degrees.

Default = 0.0 (Real or blank)


  1. All the grid points must be located in the x-z plane of the basic coordinate system with x = r ≥ 0 and ordered consecutively starting at a corner grid point and proceeding around the perimeter in either direction.
    Corner grid points G1, G3 and G5 must be present. The edge points G2, G4 and G6 are optional. If any of the edge points are present, they all must be used.
    Figure 1. CTRIAX6 Definition

  2. The continuation is optional.
  3. If MID is defined on a MAT3 entry, material properties and stresses are always given in the (xm, zm) coordinate system shown in Figure 1.
  4. 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:
    ( 200 N / m ) * 2 π * ( 0.4 m ) = 502.655 N
  5. CTRIAX6 and CTAXI elements cannot be used simultaneously in an input model.
  6. 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.
  7. This card is represented as an element in HyperMesh.