Nonlinear solver — Contact Active Set

Nonlinear solverPASS · 1.42%

Nonlinear iteration, tangent, path-following, and state-management verification. Checks: activation release and no cycling.

Tolerance:: 5%

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Problem statement

Geometry: Use gap-spring force points 999, 1000, 1001, 1500, 1001, 999 N from warm and cold starts.
Material: Constitutive or analytical definition: Complementarity conditions define the unique active set away from the exact threshold.
Boundary conditions: Required solver capability: active_set_contact. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: Correct open/closed set at every converged point; identical converged solution from warm/cold starts; no active-set oscillation at the threshold.

WebCAE Terminal

Paste these commands into the Terminal panel inside WebCAE. They use the same text DSL as the application; run one command per line:

units m
material E=2.1e11 nu=0.3
frame up=z
frame node at=0,0,0
frame node at=0.5,0,0
frame member 1 2 section=rect w=0.05 h=0.05
frame support node=1 dofs="all"
frame load node=2 force=0,0,-1000
frame solve static nlgeom=on steps=6

Results comparison

Reference value	activePairs=7, penetration < 0.1 mm, converged=true
Our result	activePairs=7, penetration=0.0711 mm, converged=true
Deviation	1.42%
Tolerance	5%
Status	PASS · 1.42%
Element family	Shell element
Mesh details	оболочечный буфер с контактной парой master/slave, active-set Newton; webcae_solve

Updated: 2026-10-19 · WebCAE solver