Staged analysis: a body born on a loaded structure carries nothing
Birth and death of elements (staged analysis)PASS · <0.01%A 500 × 500 × 1000 mm block is compressed by a face pressure; a second block is then cast against its side face (born) while the load stays the same. The new body takes the deformed configuration of the first as its stress-free reference, so it stays unstressed and the first block keeps carrying the whole load. An ordinary analysis with both blocks present from the start would let the glued side face share the load.A 500 × 500 × 1000 mm block is compressed by a face pressure; a second block is then cast against its side face (born) while the load stays the same. The new body takes the deformed configuration of the first as its stress-free reference, so it stays unstresse… show full text
- Tolerance:
- 5%
Problem statement
- Geometry
- Body 1: 500 × 500 × 1000 mm; body 2: 250 × 500 × 1000 mm glued to its side face (x = 500 mm); P1 tetrahedra, size 125 mm; base face of body 1 fixed.
- Material
- E = 20 GPa, ν = 0, no gravity.
- Boundary conditions
- Pressure 100 kPa on the top face of body 1. Stage 1: body 1 only. Stage 2: body 2 is born; the load does not change.
- Measured quantity
- Vertical displacement of the top of body 1 on both stages (target −pL/E = −0.005 mm) and the von Mises stress on the free outer face of body 2 relative to p (target 0).
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
primitive box dx=500 dy=500 dz=1000
primitive box dx=250 dy=500 dz=1000 ox=500
mesh tet size=125 bonding=1 glue=full
fix surface number 5
load surface number 6 pressure=100000
nlgeom on pressure=dead
stage add name=loaded_A
stage add name=cast_C activate=body2
solve static
stage view 1
probe displacement_z at x=0 z=1000 id="uA_before"
stage view 2
probe displacement_z at x=0 z=1000 id="uA_after"
probe vonMises at x=750 id="vmC_outer"
probe vonMises at x=0 id="vmA_outer"Results comparison
| Reference value | u_A = −pL/E = −0.005 мм на обеих стадияхσ_vM(C) = 0 |
| Our result | u_A = -0.00500004 → -0.00500004 ммσ_vM(C)/p = 4.21e-7 |
| Deviation | <0.01% |
| Tolerance | 5% |
| Status | PASS · <0.01% |
| Mesh details | тет4 (P1), размер 125 мм (1034 тетр.), сборка из склеенных тел; 2 стадий, 12 шагов, 12 итераций Ньютона; мягкость неактивных элементов 1e-6; 2.7 с на скрипт (сетка + расчёт) на нативе |
Updated: 2026-10-22 · WebCAE solver