# CMBEAMM

Bulk Data Entry Defines a beam element for multibody dynamic solution sequence without reference to a property entry based on markers.

## Format

(1) (2) (3) (4) (5) (6) (7) (8) (9) (10)
CMBEAMM EID MID M1 M2       L
A I1 I2 J K1 K2

## Example

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

(Integer > 0)

M1 Marker identification number.

(Integer > 0)

M2 Marker identification number.

(Integer > 0)

L Undeformed length along the X-axis of the beam.

(Real)

A Area of the beam cross-section.

(Real)

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)

1. The X-axis of the markers M1 and M2 should always be along the axis of the beam.
2. The moments of inertia are defined as:(1)
$\begin{array}{c}|1={/}_{zz}=\int {y}^{2}dA\\ |2={/}_{yy}=\int {Z}^{2}\mathit{dA}\end{array}$
The beam coordinates must be aligned with the principal axes of the cross-section.
3. 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).
4. This card is represented as a bar element in HyperMesh.