Staged analysis: a single stage with every body active equals an ordinary static solve
Birth and death of elements (staged analysis)PASS · 0%Three stacked bodies are compressed by a face pressure. The same model is solved twice on the native solver: as an ordinary nonlinear static analysis and with one stage that activates nothing and kills nothing. The displacements and von Mises stresses must coincide; a stage with every element active is not allowed to change the answer.Three stacked bodies are compressed by a face pressure. The same model is solved twice on the native solver: as an ordinary nonlinear static analysis and with one stage that activates nothing and kills nothing. The displacements and von Mises stresses must coi… show full text
- Tolerance:
- 5%
Problem statement
- Geometry
- Three bodies 500 × 500 × 1000 mm stacked along z, P1 tetrahedra of size 150 mm in one conformal mesh; base face fixed.
- Material
- E = 20 GPa, ν = 0.3.
- Boundary conditions
- Pressure 200 kPa on the top face of body 3. Variant 1: no stages. Variant 2: one stage “all”. Dead pressure, geometric nonlinearity on, native solver.
- Measured quantity
- Displacement of the planes z = 1, 2, 3 m and von Mises stress at z = 0 and z = 1.5 m, variant 2 against variant 1 (target 0 difference).
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=2e10 nu=0.3
primitive box dx=500 dy=500 dz=1000
primitive box dx=500 dy=500 dz=1000 oz=1000
primitive box dx=500 dy=500 dz=1000 oz=2000
mesh tet size=150 bonding=1 glue=full
fix surface number 5
load surface number 58 pressure=2e5
nlgeom on pressure=dead
stage add name=all
solve static
probe displacement_z at z=1000 id="u1000"
probe displacement_z at z=2000 id="u2000"
probe displacement_z at z=3000 id="u3000"
probe vonMises at z=0 id="vm0"
probe vonMises at z=1500 id="vm1500"Results comparison
| Reference value | разность одной стадии и обычной статики = 0 |
| Our result | макс. отклонение 0.00e+0 % (u_z, σ_vM) |
| Deviation | 0% |
| Tolerance | 5% |
| Status | PASS · 0% |
| Mesh details | тет4 (P1), размер 125 мм (1286 тетр.), сборка из склеенных тел; 1 стадий, 6 шагов, 11 итераций Ньютона; мягкость неактивных элементов 1e-6; 3.3 с на скрипт (сетка + расчёт) на нативе |
Updated: 2026-10-22 · WebCAE solver