NAFEMS LE7
Static (shells)PASS · 3.4%Axisymmetric thin-walled cylinder/sphere pressure vessel — axial stress check on the outer surface.
- Tolerance:
- 5%
Problem statement
- Geometry
- Axisymmetric thin-walled pressure-vessel section (cylinder joined to a spherical head).
- Material
- E = 210 GPa, ν = 0.3.
- Boundary conditions
- Ur = 0 at point A; Uz = 0 at point F; internal pressure of 1 MPa.
- Measured quantity
- Axial stress on the outer surface at point D (R = 1.0125, Z = 1.4034) — reference value 25.86 MPa.
Results comparison
| Reference value | 25.86 МПа (TNSB-1990) |
| Our result | 26.11 МПа (мелкая), 24.98 МПа (базовая) |
| Deviation | 3.4% |
| Tolerance | 5% |
| Status | PASS · 3.4% |
| Element family | Solid element |
| Mesh details | hex8-клин 2° тела вращения (644 → 1134 узлов, 6 → 8 эл. по толщине), симметрия на срезах; сфера отсечена при φ=75° и заменена мембранным натяжением pR/2; σzz(D): 24.98 → 26.11 МПа (мембранная часть pR/2t = 20 МПа + краевой изгиб) |
Updated: 2026-08-10 · WebCAE solver