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Mental model ~5 min · ~69 min remaining

Contact pair

CONTA174 vs. TARGE170, normals, CNCHECK, and friction reserved for the challenge.

Operational mental map

Contact: geometry, status, and force

A contact pair is credible only when orientation, initial status, and forces tell one coherent story.

Complete the diagram from memory

Predict the missing relationships before revealing the model

Write the idea, not the exact wording. The comparison is feedback, not a grade.

3 missing links
1Input

Interface

Faces, normals, and TARGE170/CONTA174 roles.

Mental model — Contact pair

3D blocks with CONTA174 and TARGE170
Figure 1. Target surface on the lower block; contact on the upper block; normal pointing toward the gap.
  • Contact: CONTA174 — surface that may penetrate the target.
  • Target: TARGE170 — reference surface.
  • Initial state: CNCHECK reports gaps, penetration, and open/closed pairs.
  • Frictionless: KEYOPT,2,12,0 in the base deliverable.
Quick check

Which element belongs on the bottom face of the upper block?

View complete module Download m11-kit.zip