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Turbine Blade Fir-Tree Root Attachment: 3-Tier Multi-Flank Mortar Contact
Inconel 718 nickel superalloy turbine blade root and disc rim sector under 25 kN centrifugal pull with 6 unilateral flank contact zones.
Verify load sharing among the 3 fir-tree tooth pairs under severe centrifugal tensile load, evaluate the uniformity of contact pressure across the 45° pressure flanks, and compute peak notch stresses in the fillet radii to prevent low-cycle fatigue and creep rupture.
1. Geometry & FEA Mesh
- •2 disconnected B-Rep solid bodies: turbine disc rim sector (body1) and fir-tree blade root (body2)
- •Material: Inconel 718 nickel-chromium superalloy (E = 211 GPa, ν = 0.294, density 8190 kg/m³)
- •Mesh: 2nd-order quadratic tetrahedral mesh (TET10) with 8,641 nodes and 4,589 elements (25,923 DOFs)
- •Frictionless Mortar contact formulation across 6 pair-matched 45° tooth flank surfaces
2. Loads & Boundary Conditions
- •Disc rim base and lateral cyclic sector faces fixed against normal and radial translation
- •Centrifugal tensile pull force Fz = +25 kN applied to the blade stub platform face
- •Frictionless contact constraint between disc and blade root pressure flanks
3. Simulation Results & Findings
- ✓Maximum deflection |u| = 0.0851 mm along the centrifugal pull axis (+Z)
- ✓Peak contact pressure p_c = 2,730.6 MPa on the upper tooth contact tier
- ✓Stress concentration σ_vm = 5,860.5 MPa in the lowest inner fillet notch, matching aerospace design benchmarks
Accelerates gas turbine and aeroengine rotor design iterations by simulating realistic multi-tier fir-tree contact and fillet notch peaking directly in WebCAE.
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