Force
The Force/Torque PropertyManager
applies forces, moments, or torques with uniform distribution to faces,
edges, reference points, vertices and beams in any direction for use in
structural studies. The specified force value is applied to each
selected vertex, edge, face or beam. When you apply a force to a face
or edge, the specified value represents the magnitude only. For example,
if you apply a force that is normal to a full cylindrical face, the vector
sum of the applied forces is zero.
You can apply nonuniform forces to faces and to shell edges. A nonuniform
force is specified by a force value and force distribution. The force
value is set equal to the summation of the absolute values of the forces
applied to each
face. The force distribution is described by the coefficients of a second-order
polynomial in terms of x and y axes of the reference coordinate system
as described for variable pressure.
Nonuniform torque is not supported in this
release.
In an assembly, you can use
reference geometry from the assembly or the components (parts and sub-assemblies)
of the assembly.
Units . Sets the units that will be used to enter numerical values
of the force/moment/torque. Available units are: SI,
English (IPS), and Metric
(G).
Force/Normal
Force/Torque. Sets values for the force components, normal force,
or torque.
Check the component's box
to specify nonuniform distribution.
Select a
Coordinate System . Select a coordinate system to
define the nonuniform force.
Equation
Coefficients. Sets the polynomial coefficients which describe the
spatial variation of the force in the selected coordinate system. The
coefficients should be specified based on the units of x and y as shown
in the following table:
Selected Unit System |
Units of X and Y |
Units of "Value" |
SI |
m (meters) |
N (Newtons) |
English (IPS) |
in (inch) |
lb (pounds) |
Metric (G) |
cm (centimeters) |
kgf (Kilogram force) |
NOTES
The nonuniform force distribution is defined
by a reference coordinate system and the associated coefficients of a
second-order polynomial.
F(X,Y)
= A + B*X +
C*Y
+ D*X*Y +
E*X^2 + F*Y^2
Where:
F(X,Y)
= relative magnitude of force applied at a point with coordinates x and
y in the selected coordinate system
X, Y
= coordinates
of the point relative to the selected coordinate system
A,
B, C,
D, E,
and F
are polynomial coefficients
* indicates multiplication
The force value you enter in the force field
is the value actually applied to the selected entities, if the force doesn't
reverse direction on the geometric entity to which it is applied. If the
force reverses direction along a geometric entity (face or edge), the
applied force value is equal to the summation of the absolute values of
the forces applied to all nodes on the face or edge.
Click here
for a summary on specifying force and torque.