Rigid to Rigid Contact
A Rigid to Rigid contact captures contact forces between two rigid bodies moving relative to each other in either a 3D frame or a 2D plane.
Define the Connectivity of 3D Rigid to Rigid Contacts
From the Connectivity, the bodies/graphics involved in the contact can be defined. Checks on graphics for suitability for contacts can also be performed.
Additional Comments:
- In the ADAMS solver mode, if the graphic defined is a File type graphic - it will require an additional parasolid file.
- The individual graphics involved in contact should form a closed volume. In other words, the graphic mesh should not have any open edges or T-connections. Use the Highlight mesh errors option to check for open edges and T-connections.
- The normal of the mesh should point in the direction of contact. The side of the
surface mesh, when seen such that the normal direction points towards the viewer
is the contact side. If viewed from the opposite direction, it is referred to as
the material side. Use the Material Inside and
Highlight contact side options in the panel to set
the correct direction of contact. Below is an example of how the Material Inside
and Highlight contact side options work:
With both of the graphics having the Material Inside option activated, checking the Highlight contact side option will display the color for both of these graphics in red when viewed from the outside of the graphics.
In certain cases, if the contact direction is on the reverse, the Material Inside flag can be flipped.
Refer to Best Practices for Running 3D Contact Models in MotionSolve to understand more about building models for successful contact simulation.
Define the Connectivity of 2D Rigid to Rigid Contacts
From the Connectivity, the bodies/graphics involved in the 2D contact can be defined. Checks on graphics for suitability for contacts can also be performed.
- The individual curve graphics involved in 2D contact must use planar curves only. A planar curve has all of its data points in a single plane.
- Currently, MotionView only supports 3D
Cartesian/parametric curves for creating curve graphics that can be used in
2D contact. Below is an example of how the Highlight contact side option
works:
The example above shows a rack and a pinion represented with curves and a 2D contact defined between them. The side of the pinion on which the arrows are pointing (which is outside) indicate the side the contact is expected. Similarly, the arrows on the pinion curve have arrows pointing on it from the outside.
In the case where the contact is expected from the opposite side, the Flip Contact Side option can be used.
Define the Properties of Rigid to Rigid Contacts
Parameters for normal and friction force calculations are defined in the Properties tab.
- Click the Properties tab.
- Use the tabs located at the top of the panel to distinguish between a normal force or a friction force.
Normal Forces
This tab is used to set the method and related properties to calculate the normal force during contact. The following four models for defining the normal force are supported: Impact, Poisson, Volume, and User-Defined.
Friction Forces
This tab is used to determine the options to include or exclude Coulomb friction in the calculation of the contact force.
Define the Advanced Options of Rigid to Rigid Contacts
The Advanced tab provides advanced options to control the contact event during simulation in MotionSolve.