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Proposal Presentation: Multiaxial Fatigue Analysis of Composite Tension-Torsion Straps for Rotor Systems Ryan T. Casey

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Tension-Torsion Strap McDonnell Douglas MD-500E Rotor Head

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Common Rotor System Configuration for T-T Strap Tension-Torsion Strap Flap Hinge Lead/Lag Hinge Pitch Housing Blade Attachment

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Loading Conditions of T-T Strap 1.CF Load 2.Torsional Twist due to Pitch Input 3.Small Flatwise Bending due to Pitch Housing Deflection

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Methodology Classical Laminate Theory –Material Properties (E, G, etc…) Develop FEA model –Determine Notch Factors Develop Stress Spectrum Multiaxial Fatigue Failure Theories: –Max Principal Strain, Von Mises, Max Shear Strain, Lohr-Ellison, Kandil-Brown-Miller

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Expected Results Fatigue Life Range Prediction for Composite T-T Strap FEA Models (ANSYS Workbench) Equivalent Material Properties from Laminate Theory Notch Factors

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Project Task Milestones Due Date Research in Classical Laminate Theory & Classical Laminate TheoryFebruary 12, 2010 Determine Design Parameters/RequirementsFebruary 12, 2010 Common Stress Spectrum CreationFebruary 19, 2010 Complete FEA of Metal Strap ConfigurationMarch 5, 2010 Composite Design concurrent w/ FEM & Fatigue AnalysisMarch 5, 2010 Finalize Composite Strap DesignMarch 19, 2010 Complete FEM & Fatigue Life AnalysisMarch 26, 2010

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