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Ryan T. Casey

RPI Masters Engineering Project: Preliminary Design and Optimization of Composite Tension-Torsion Strap for Rotor Systems 4/21/2010. Ryan T. Casey. CF Load Torsional Twist due to Pitch Input Small Flatwise Bending due to Pitch Housing Deflection. Tension-Torsion Strap .

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Ryan T. Casey

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  1. RPI Masters Engineering Project:Preliminary Design and Optimization of Composite Tension-Torsion Strap for Rotor Systems4/21/2010 Ryan T. Casey

  2. CF Load • Torsional Twist due to Pitch Input • Small Flatwise Bending due to Pitch Housing Deflection Tension-Torsion Strap MD500 Rotor System

  3. Methodology • Utilize Classic Laminate Theory to Determine Equivalent Material Properties • Create ANSYS models (static) • Determine Kts • Determine Stresses & Strains in Pitch Section, Lug-to-Pitch Section Transition • Lug Failure Modes • Optimize Geometry • Recommendations for Future Work

  4. ANSYS Models

  5. Preliminary Design Constraints • Lug Sizing - e/d = 2 • Use IM7/8552 (Carbon/Epoxy) Unidirectional Tape • Case1 (02/+-452/902/+-452/02) • Case2 (0/+-45/0) • Case3 (03/+-45/03) • Length Varies between 12-18 in • CFmax = 30000lb, Max Pitch Angle = +/- 10deg

  6. Stress Concentration (Kt)

  7. MSnt = 0.27 for max CF load 30,000lb Lug Analysis Net Tension Failure Load (Pnt) Bearing Failure

  8. FEA Results 0.4% Elongation

  9. FEA Results • Effect of Flatwise Bending Load on Shear Stresses • 0.5 deg flatwise displacement

  10. Final Configuration

  11. Recommendations

  12. Questions?

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