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
K
K
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)
K, K
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:Figure 1.
|1=/zz=∫y2dA|2=/yy=∫Z2dA
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.
