Contact — Open Close Cycle

ContactPASS · 0%

Unilateral, frictional, sliding, or interference-contact verification. Checks: active-set hysteresis bugs and release.

Tolerance:: 5%

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Problem statement

Geometry: Use the gap-spring model with force history 0 -> 1500 -> 0 -> -200 -> 0 N.
Material: Constitutive or analytical definition: Piecewise Signorini solution; reversible elastic spring stores no residual energy.
Boundary conditions: Required solver capability: unilateral_contact. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: Contact activates once on loading, releases when reaction reaches zero, never carries tension, and returns to the initial zero-energy state.

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 mm
material E=1e9 nu=0.0
box width=1.0 depth=1.0 height=1.0
box width=0.6 depth=0.6 height=1.0
contact frictionless slave="surface number 11" master="surface number 6"
mesh tet size=0.5 order=1 bonding=0
fix surface number 1
fix surface number 7 component=x
fix surface number 8 component=y
spring surface number 11 stiffness=1000 component=z
load surface number 12 force=-1500 component=z
solve nonlinear steps=16
extract reaction target="surface number 6"

Results comparison

Reference value	500.0000 N at F=1500 N0.0000 N at F=-200 N and F=0 N (residual energy U=0)
Our result	499.9988 N at F=1500 N0.0000 N at F=-200 N (u=-0.2000 mm)U=1.97e-42 N*mm at F=0 N
Deviation	0%
Tolerance	5%
Status	PASS · 0%
Element family	Solid element
Mesh details	16 nodes, 12 tet4 elements + elastic spring k=1000 N/mm, initial gap g0=1.0 mm, 16 load steps (0->1500->0->-200->0 N)

Updated: 2026-10-27 · version not recorded