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Fuselage Barrel Section with Door Cutout
Internal cabin pressurization, canted door frame shear flow, and passenger floor bending analysis.
A 7.0-meter pressurized fuselage barrel with 3.9-meter diameter incorporates 96 longitudinal stringers, ring frames spaced at 0.5 m, a reinforced passenger service door cutout, and transverse floor beams with vertical stanchions. Pressurization to 0.06 MPa creates severe hoop tension and shear concentration at cutout corners that must be redistributed into surrounding doubled frames. WebCAE verifies hoop expansion, door surround stress peaks, and uncoupled vertical/horizontal bending vibration frequencies.
1. Geometry & FEA Mesh
- •Cylindrical skin: diameter 3.90 m, length 7.0 m, 1.8 mm aluminum skin (E = 72 GPa, ν = 0.33, ρ = 2780 kg/m³), discretized into 27 zone-divided cylindrical patches.
- •Stringers & frames: 96 inner T-stringers (36 × 1.6 mm flange, h = 24 mm), 15 inner I-frames (90 × 30 × 2 × 2.5 mm), and heavy I-frames (120 × 45 mm) flanking the door cutout.
- •Passenger floor: 3 mm aluminum quad deck resting on transverse I-beams at every frame, 2 longitudinal seat tracks, and 15 tubular stanchions (Ø40 × 2 mm).
- •Cutout geometry: passenger door 1.0 × 1.57 m spanning 2 bays and 13 stringer pitches with reinforced perimeter edge members.
2. Loads & Boundary Conditions
- •Cabin pressurization Δp = 0.06 MPa (0.6 atm) applied over internal shell surfaces with closed end-bulkhead axial tension equilibrium.
- •Rigid diaphragm boundary condition at x = 7.0 m to preserve cross-sectional circularity under transverse and torsional loads.
- •Isostatic 3-2-1 constraint at root ring frames eliminating artificial local restraint moments while equilibrating symmetric internal pressure.
3. Simulation Results & Findings
- ✓Baseline cylinder membrane hoop stress σ_θ = 64.99 MPa and radial expansion u_r = 1,469.7 μm match theoretical formulas within 0.01% and 0.02% error.
- ✓Fundamental cross-sectional vertical bending frequency f₁ = 31.369 Hz and horizontal bending frequency f₂ = 41.116 Hz.
- ✓Full barrel model captures 3D stress concentration around door cutout corners with smooth shear stress dissipation across adjacent stringers.
Airframe stress engineers use WebCAE to assess window belt cutouts, cargo doors, and floor beam load redistribution interactively without waiting for batch cluster queues. The pre-calculated .caeweb container delivers full 3D stress tensors, beam axial loads, and mode animations to structural review committees in any web browser.
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