A rigid link is a type of connection that connects geometric entities such as surfaces, curves, and points so that they remain rigidly connected during an analysis. Rigid links can be used to effectively replace a component whose rigidity is far greater than the others, and whose only contribution is to maintain set displacements between attached components. Components so connected are free to move in any manner, but will maintain their relative positions.
Click Refine Model > Rigid Link open the Rigid Link Definition dialog box to create rigid links in your model. Rigid links are available in native as well as FEM mode.
When you connect entities using rigid links, be aware of the following:
The entities move together as if part of a single rigid body.
The entities do not deform, but the rigid body can move as a whole.
Because Creo Simulate uses linear constraint equations to enforce the rigid rotations, rather than equations with sines and cosines, you should use rigid links only for small rotation angles of rigidly connected entities. Use rigid links in this way, even if you intend to use them in a large deformation analysis.
The following apply to 3D and 2D models:
You can create, edit, and delete rigid links.
You can turn rigid link visibility on and off by selecting or clearing Rigid Links check box on the Simulation Display dialog box.
Additionally, you can use rigid links to connect two or more parts at selected surfaces, or to help idealize complex models. For example, you can use a rigid link to connect a point mass representing an engine to the engine mount bolt holes.
You can create a rigid link from one point to a second point. If you are working with a 3D model, at least one of the points must meet one of these two conditions:
The point must lie on a spring, beam, or shell.
The point must act as the reference for a point constraint with at least one free rotation, a point load with a moment, or a point mass with a nonzero moment of inertia.
You can create a rigid link from one or more curves or surfaces on your model to a free point that is not otherwise associated with the model geometry. Use a rigid link from a surface to a free point with a constraint, for example, to model a pin support. If you create a rigid link from one edge, to a free point, and then to a second edge, the two edges will move together when you apply a load.
When you create a rigid link to a free point, be aware of the following:
You can create a displacement measure on a free point with a rigid link, but the point will not be visible when you view results.
You cannot query displacements or rotations at rigidly connected free points. However, Creo Simulate will include loads or constraints on a rigidly connected point when calculating measures over the entire model, such as maximum displacement.