[转载]ANSYS接触单元pinball region的作用

ANSYS接触单元pinball region的作用
1、作用一：pinball region可用于判别接触单元的接触状态，接触状态分为四种：

• STAT = 0 Open far-field contact
  
• STAT = 1 Open near-field contact
  
• STAT = 2 Sliding contact
  
• STAT = 3 Sticking contact
  

A contact element is considered to be in near-field contact when its integration points (Gauss points or nodal points) are within a code-calculated (or user-defined) distance to the corresponding target surface. This distance is referred to as the pinball region. The pinball region is a circle (in 2-D) or a sphere (in 3-D) centered about the Gauss point.
当接触单元的积分点位于pinball region之内时，可认为其处于接触近区；pinball region在2D问题中为圆，在 3D问题中位球体，中心均位于目标单元的高斯点上。
The computational cost of searching for contact depends on the size of the pinball region. Far-field contact element calculations are simple and add little computational demands. The near-field ca