Contact — Coulomb Stick Slip

ContactPASS · 0%

Unilateral, frictional, sliding, or interference-contact verification. Checks: stick-slip transition and friction cone.

Tolerance:: 5%

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Problem statement

Geometry: Rigid block with N=1000 N and mu=0.3; ramp tangential force from 0 to 450 N.
Material: Constitutive or analytical definition: |T|<=mu N in stick; |T|=mu N in sliding.
Boundary conditions: Required solver capability: coulomb_friction. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: Sticking while |T|<300 N; slip onset at 300 N; sliding reaction magnitude remains mu N with opposite sign.

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=1e9 nu=0.0
box width=1.0 depth=1.0 height=0.5
box width=0.6 depth=0.6 height=0.4
contact frictional mu=0.3 slave="surface number 11" master="surface number 6"
mesh tet size=0.5 order=1 bonding=0
fix surface number 1
fix surface number 8 component=y
load surface number 12 force=-1000 component=z
load surface number 12 force=450 component=x
solve nonlinear steps=10
extract reaction target="surface number 6"

Results comparison

Reference value	-300.0000 N (\|T\|=mu*N at Q=301..450 Nstick \|T\|=Q for Q<300 N)
Our result	-300.0000 N (Rz_master=1000.00 N, stick=4/4 for Q<=299 N, slip=4/4 for Q>=301 N)
Deviation	0%
Tolerance	5%
Status	PASS · 0%
Element family	Solid element
Mesh details	16 nodes, 12 tet4 elements (base block + sliding block, 4 slave contact nodes, eps_N=1e8 N/m, eps_T=1e8 N/m, mu=0.3)

Updated: 2026-10-27 · version not recorded