Using the Pinball Region Field to Fine Tune the Scope of Joints

Pinball Region (Radius) with Contact Elements

You may not have noticed an advanced feature in Ansys Mechanical that allows additional control over the geometric Scope of various objects. These objects include Joints, Remote Points, Springs, Point Masses, Remote Force, and Remote Displacement. The feature is called Pinball Region and is different but analogous to the Pinball Radius used with contact elements.

When one of these objects is created the user must scope it to a surface or set of surfaces. Behind the scenes the solver uses MPC equations to distribute the loads (from the actual joint element or point mass etc.) to a set of element faces on each body.

Using MPC Equations in the Absence of a Pinball Region

Using the spring example shown in Figure 1 MPC equations would be placed on the entire scope in the absence of this Pinball Region. In this case the entire scope would be too large of an area to distribute the spring load. By defining a reasonable value for the Pinball Region in the details of these objects, the number of element faces is reduced between the spring and the solid element as shown in as shown in Figure 2, (cyan colored elements). The size of the Pinball Region is shown graphically as a translucent sphere (red or blue typically). Users are still able to create a face imprint in order to define the contact surface where precise control is desired however the Pinball Region feature offers a rapid alternative.


Fine Tune the Scope of Joints in Mechanical | Pinball Region Field


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