CMBEAM
Bulk Data Entry Defines a beam element for multibody dynamics solution sequence without reference to a property entry.
Format
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| CMBEAM | EID | MID | GA | GB | X1, G0 | Y1 | Z1 | L | |
| A | I1 | I2 | J | K1 | K2 |
Example
| (1) | (2) | (3) | (4) | (5) | (6) | (7) | (8) | (9) | (10) |
|---|---|---|---|---|---|---|---|---|---|
| CMBEAM | 1 | 2 | 123 | 125 | 0.0 | 0.0 | 1.0 | 5.0 | |
| 100.0 | 833.3 | 833.3 | 1485.3 |
Definitions
| Field | Contents | SI Unit Example |
|---|---|---|
| EID | Unique element
identification number. (Integer > 0) |
|
| MID | Material identification
number. Only MAT1 material definitions may be referenced by this element. (Integer > 0) |
|
| GA, GB | Grid point identification
number of connection points. (Integer > 0; GA ≠ GB) |
|
| X1, Y1, Z1 | Components of vector v at
end A, measured at end A,
parallel to the components of the displacement coordinate system for
GA, to determine (with the vector from end
A to end B) the orientation of the element
coordinate system for the BEAM element. (Real) |
|
| G0 | Grid point identification
number to optionally supply X1,
X2, and X3 (Integer > 0).
Direction of orientation vector is GA to
G0. (Integer > 0) |
|
| L | Undeformed length along
the X-axis of the beam. (Real) |
|
| A | Area of the beam
cross-section. No default (Real > 0.0) |
|
| I1 | Area moment inertia in
plane 1 about the neutral axis. No default (Real > 0.0) |
|
| I2 | Area moment inertia in
plane 2 about the neutral axis. No default (Real > 0.0) |
|
| J | Torsional
constant. (Real > 0.0) |
|
| K1, K2 | Area factor for
shear. Default = 0.0 (Real) |
Comments
- The X-axis of the beam is always along the line connecting G1 and G2. The Z-axis of the beam is determined based on the X-axis and the Y-axis provided by G3/X1, Y1, and Z1.
-
The moments of inertia are defined as:
(1) The beam coordinates must be aligned with the principal axes of the cross-section. - The transverse shear stiffness in planes 1 and 2 are (K1)AG and (K2)AG, respectively. If a value of 0.0 is used for K1 and K2, the transverse shear flexibilities are set to 0.0 (K1 and K2 are interpreted as infinite).
- This card is represented as a bar2 element in HyperMesh.