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48 m Composite Wind Turbine Blade
Verification of flapwise skin buckling, shear web stability, and aeroelastic modal frequencies for a 48 m composite wind turbine blade.
Modern utility-scale wind turbine blades are slender composite structures subject to intense aerodynamic lift, cyclic turbulence, and centrifugal loads. During extreme wind gusts, maximum compressive stresses develop in the upper shell and spar caps, creating high vulnerability to localized skin wrinkling and shear web buckling. The WebCAE model replicates the full 3D aerodynamic twist, circular root transition, internal shear webs with shared nodes, and variable-thickness glass/carbon composite layups.
1. Geometry & FEA Mesh
- •48.0 m blade length: Ø2.6 m circular hub root transitioning to NACA 63-418 airfoil (max chord 3.8 m at x = 10 m, tip chord 0.9 m, 14° aerodynamic twist)
- •3 spanwise shell thickness zones: root zone t = 28 mm, mid-span zone t = 18 mm, and tip zone t = 10 mm (glass/epoxy composite E = 42 GPa)
- •Two internal longitudinal shear webs (t = 16 mm) located at 30% and 60% chord, capped with high-modulus carbon fiber spar caps (E = 120 GPa)
- •Model composed of 896 MITC4 quadrilateral shell elements and 432 Timoshenko beam elements (4,998 DOFs)
2. Loads & Boundary Conditions
- •Rigid cantilever clamping at circular root flange bolt circle (x = 0, all 6 DOFs constrained)
- •Aerodynamic flapwise lift and edgewise drag load distribution corresponding to IEC 61400 extreme 50-year storm gust
- •Centrifugal axial tension forces from rotor rotation combined with blade self-weight
3. Simulation Results & Findings
- ✓Critical buckling factor λ₁ = 2.83 satisfies IEC 61400 requirements against compressive skin wrinkling under storm gusts
- ✓Fundamental flapwise bending frequency f₁ = 0.676 Hz accurately matches experimental full-scale blade test resonance data
- ✓Carbon spar caps safely sustain tensile and compressive loads, keeping shear deformation in vertical webs well below allowable thresholds
Wind turbine manufacturers and composite blade developers perform aeroelastic and buckling verification in WebCAE directly inside web browsers. Fast iteration of composite layer schedules and shear web positions cuts physical certification testing cycles and prevents catastrophic blade failures.
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- ✓Nonlinear Contact & Buckling (Kσ, MITC4, RBE2/RBE3)
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