CPYRA

Bulk Data Entry Defines the connections of the PYRA solid element.

Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CPYRA EID PID G1 G2 G3 G4 G5 G6
G7 G8 G9 G10 G11 G12 G13
CORDM CID

Example

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CPYRA 71 4 3 4 5 6 7

Definitions

Field Contents SI Unit Example
EID Unique element identification number.

No default (Integer > 0)
PID A PSOLID property entry identification number.

Default = EID (Integer > 0)
G# Grid point identification numbers of connection points.

Default = blank (Integer ≥ 0 or blank)
CORDM Flag indicating that the following field references the material coordinate system.
CID Material coordinate system identification number.

Default = 0 (Integer ≥ -1)

Comments

  1. Grid points G1,…,G4 must be given in consecutive order about the quadrilateral face.

    The edge points, G6 through G13, are optional. If any of the edge points are present, they all must be used. The continuation must not be present for the 5-noded version of this element.

    It is recommended that the edge points be placed near the middle of the edge.
    Figure 1. CPYRA Definition


  2. Stresses are output in the material coordinate system. The material coordinate system is defined on the referenced PSOLID entry. It may be defined as the basic coordinate system (CORDM = 0), a defined system (CORDM = Integer > 0), or the element coordinate system (CORDM = -1).
  3. The element coordinate system for the CPYRA element is defined as follows:
    Three intermediate vectors R, S, and T are chosen by the following rules:
    R
    Joins the midpoints of the edges from G1 to G4 and G2 to G3.
    S
    Joins the midpoints of the edges from G1 to G2 and G3 to G4.
    T
    Joins the intersection of R and S to G5.
    Figure 2. CPYRA Element Coordinate System


    The origin of the element coordinate system is located at the intersection of the vectors R and S.

    The element z-axis corresponds to the T vector.

    The element y-axis is the cross product of the T and R vectors.

    The element x-axis is the cross product of the element y-axis and the element z-axis.

  4. For more information, refer to Three-dimensional Solid Elements in the User Guide.
  5. This card is represented as a pyra5 or pyra13 element in HyperMesh.