Next: *NO ANALYSIS
Up: Input deck format
Previous: *MODAL DYNAMIC
  Contents
*MPC
Keyword type: model definition
With this keyword card a multiple point constraint is defined, usually
a nonlinear one. Right now, three different MPC's can be selected.
- A plane MPC (name PLANE). This MPC specifies that all nodes
listed within this MPC card should stay in a plane. The first three
nodes are the defining nodes and should not lie on a line. For all
subsequent nodes a nonlinear MPC is generated expressing that they
stay within the plane. Notice that the plane can move during
deformation, depending on the motion of the defining nodes.
- A straight line MPC (name STRAIGHT). This MPC expresses that all
nodes listed within this MPC card should stay on a straight line. The
first two nodes are the defining nodes and should not coincide. For
all subsequent nodes two nonlinear MPC's are generated expressing that
they stay on the straight line. Notice that the straight line can move
during deformation, depending on the motion of its defining nodes.
- A user MPC (name to be defined by the user). With this option
the user can define new nonlinear MPC's.
If NLGEOM is not specified on the *STEP card, the MPC
is linearized. Note that depending on the degree of nonlinearity of
the MPC linearization can lead to significant errors in the
results. It is generally advisable to start with a linear calculation
to check the correctness of the structure, loading and boundary
conditions. If the linear calculation runs satisfactorily, a
geometrically nonlinear calculation should be performed.
There are no parameters for this keyword card.
First line:
Second line:
- MPC type
- list of nodes participating in the MPC: maximum 15 entries. Zero
entries are discarded.
Following lines (as many as needed):
- list of nodes participating in the MPC: maximum 16 entries. Zero
entries are discarded.
Example:
*MPC
PLANE,3,8,15,39,14
specifies that nodes 3, 8, 15, 39 and 14 should stay in a plane. The
plane is defined by nodes 3, 8 and 15. They should not be colinear.
Example files: beammr, beamplane, beamstraight.
Next: *NO ANALYSIS
Up: Input deck format
Previous: *MODAL DYNAMIC
  Contents
Guido Dhondt
2003-08-06