Nonlinear solver — Arclength Snap Truss

Nonlinear solverPASS · 0.04%

Nonlinear iteration, tangent, path-following, and state-management verification. Checks: path following through load limit points.

Tolerance:: 5%

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Problem statement

Geometry: Use NL_GEO_SNAP_TRUSS with load control, displacement control, and arc length from the same initial state.
Material: Constitutive or analytical definition: Equilibrium residual plus an arc-length constraint in displacement-load space.
Boundary conditions: Required solver capability: arc_length_or_generalized_displacement_control. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: Arc length traces both positive and negative slope branches without jumping; first limit point remains P=9.6225 N at u=10.57 mm.

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
frame up=z
material E=500000 nu=0.3
frame node at=0,0,0
frame node at=2500,0,25
frame member 1 2 section=rect w=10 h=10
frame support node=1 dofs="all"
frame support node=2 dofs="ux,uy,rx,ry,rz"
frame load node=2 force=0,0,-15
frame solve static nlgeom=on method=arc steps=40 maxiter=40 tol=1e-6

Results comparison

Reference value	u=10.57 mm, Pcr=9.6225 N
Our result	u=10.57 mm, Pcr=9.6225 N
Deviation	0.04%
Tolerance	5%
Status	PASS · 0.04%
Element family	Beam element
Mesh details	двухстержневая ферма Мизеса L=2500, H=25; Crisfield arc-length webcae_solve

Updated: 2026-10-19 · WebCAE solver