nastran manual


Constraints

This section describes all options that the user can find in the menu Constraints

 

Constraints (Points, Lines, Surfaces)

MENU SEQUENCE:

 


Allows assign prescribed displacements and rotations around global axes.

These conditions can be assigned over points, lines and surfaces, and affect nodes.

The prescribed displacements and rotations always make references to global axes.

Enforced Displacements (Points, Lines, Surfaces)

MENU SEQUENCE:

 


Assigns enforced displacements or rotations. The signs convention for components of a vector follows the right hand rule (see figure below).

This condition can be assigned over points, lines and surfaces, and it is attached to nodes of the entity.

Figure 3 – Positive Signs Convention

 

Enforced displacements and rotations always make references to global axes.

Fixed Temperature

MENU SEQUENCE:

 


Assigns a fixed temperature to a geometric entity, point, line or surface. This condition is use as a boundary condition for thermal analysis. Fixed Temperature is analogous to Constraints condition in Static Anaysis.