Geometric nonlinearity — Snap Truss
Static (geometric NL)PASS · 0.04%Large-displacement and large-rotation equilibrium-path verification. Checks: limit point snap-through and negative tangent.
- Tolerance:
- 5%
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Open & Solve in BrowserProblem statement
- Geometry
- Symmetric half-model shallow truss: E=500000 N/mm2, A=100 mm2, H=25 mm, L=2500 mm; vertical displacement control at the apex.
- Material
- Constitutive or analytical definition: Use the published shallow-strut cubic P(u); verify dP/du=0 at the limit point.
- Boundary conditions
- Required solver capability: corotational_or_total_lagrangian_truss. Use the loading/path control stated in the setup and preserve the complete response history.
- Measured quantity
- First limit point u=10.57 mm and Pcr=9.6225 N; reproduce the positive and negative branches through the horizontal configuration.
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-6Results 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 | симметричная полумодель фермы Мизеса L=2500 мм, H=25 мм, A=100 мм²; Crisfield arc-length webcae_solve |
Updated: 2026-10-19 · WebCAE solver