Nonlinear solver — Load Reversal

Nonlinear solverPASS · 0.02%

Nonlinear iteration, tangent, path-following, and state-management verification. Checks: trial-state rollback after rejected steps and reversed loading.

Tolerance:: 5%

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Problem statement

Geometry: Run elastic/hyperelastic 0->A->0 and J2 0->eps_max->unload paths with deliberate failed trial steps inserted.
Material: Constitutive or analytical definition: Converged history updates are committed; rejected Newton trials are not.
Boundary conditions: Required solver capability: state_commit_rollback. Use the loading/path control stated in the setup and preserve the complete response history.
Measured quantity: Elastic/hyperelastic state returns to zero energy and stress; J2 state matches the exact residual strain; failed trial steps leave no history mutation.

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=210000 nu=0.3
frame node at=0,0,0
frame node at=250,0,0
frame node at=500,0,0
frame node at=750,0,0
frame node at=1000,0,0
frame member 1 2 section=rect w=20 h=10
frame member 2 3 section=rect w=20 h=10
frame member 3 4 section=rect w=20 h=10
frame member 4 5 section=rect w=20 h=10
frame support node=1 dofs="all"
frame load node=5 force=0,350,0
frame solve static nlgeom=on steps=20 cycle=reverse

Results comparison

Reference value	w_peak=301.7 mm, w_residual=0.0 mm
Our result	w_peak=301.76 mm, w_residual=0.00e+0 mm
Deviation	0.02%
Tolerance	5%
Status	PASS · 0.02%
Element family	Beam element
Mesh details	консоль L=1000 мм, цикл нагрузка-разгрузка 0->350Н->0, rollback; webcae_solve

Updated: 2026-10-19 · WebCAE solver