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Proposal Presentation: Multiaxial Fatigue Analysis of Composite Tension-Torsion Straps for Rotor Systems Ryan T. Casey
Tension-Torsion Strap McDonnell Douglas MD-500E Rotor Head
Common Rotor System Configuration for T-T Strap Tension-Torsion Strap Flap Hinge Lead/Lag Hinge Pitch Housing Blade Attachment
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
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
Expected Results Fatigue Life Range Prediction for Composite T-T Strap FEA Models (ANSYS Workbench) Equivalent Material Properties from Laminate Theory Notch Factors
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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實驗力學研究室 1 Entire Model verse Individual Components or Groups “Pregrouping” should not pose an inconvenience for investing a single component in an assembly,
The problem to be solved is specified in a) the physical domain and b) the discretized domain used by FEA Governing principle law :
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GLAST LAT ProjectDOE/NASA Mechanical Systems Peer Review, March 27, 2003 Document: LAT-PR-0XXXX Section 7.1 Stress Analysis 1 GLAST Large Area Telescope:
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