什么是接触对? 为何透过被检测的对可以增加接触的可能性?

SANYAN68

Pinball Region: Allows you to specify the contact search size, commonly referred to as the pinball region. Setting a pinball region can be useful in cases where initially, bodies are far enough away from one another that, by default, the program will not detect that they are in contact. You could then increase the pinball region as needed. Consider an example of a surface body that was generated by offsetting a face of a solid body, possibly leaving a large gap, depending on the thickness. Another example is a large deflection problem where a considerable pinball region is required due to possible large amounts of over penetration. In general though, if you want two regions to be bonded together that may be far apart, you should specify a pinball region that is large enough to ensure that contact indeed occurs.

For bonded and no separation contact types, you must be careful in specifying a large pinball region. For these types of contact, any regions found within the pinball region will be considered to be in contact. For other types of contact, this is not as critical because additional calculations are performed to determine if the two bodies are truly in contact. The pinball region defines the searching range where these calculations will occur. Further, a large gap can transmit fictitious moments across the boundary.

Program Controlled - (default) The pinball region will be calculated by the program.

Auto Detection Value - The pinball region will be equal to the Tolerance Value as set on the Global Contact Settings. These two values being equal provides a more precise control of the Pinball Region by increasing the likelihood that contact pairs detected through the Workbench automatic contact detection are also included in the Pinball Region for the Mechanical APDL application contact. Auto Detection Value is the recommended option for cases where the automatic contact detection region is larger than a Program Controlled region. In such cases, some contact pairs that were detected automatically may not be considered in contact for a solution.

Radius - Specifies that you directly enter a value for the pinball region.
The pinball radius for the contact region is shown graphically at the annotation anchor for the Radius, Auto Detection Value, setting and possibly for the Program Controlled setting. You can move the annotation anchor to any point on the contact region, which helps in the visual verification of an appropriate pinball radius.
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什么是全域接触设定?
什么是接触对?
为何透过被检测的对可以增加接触的可能性?

sunnygu

你打墙，手和墙就是接触对。
如果你出手带风，那就连风一块定义一个ball。
你不能离墙800米就打吧。

SANYAN68

你打墙，手和墙就是接触对。
如果你出手带风，那就连风一块定义一个ball。
你不能离墙800米就打吧。
sunnygu 发表于 2011-4-17 20:35

什么是全域接触设定?
为何透过被检测的对可以增加接触的可能性?