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Steven Izzo March 6, 2008 Structures Final Stress Considerations

This research explores stress sources in launch vehicle structures and examines the effects of various factors, such as thrust vectoring, engine misalignment, spin stabilization, thermal effects, material property variance, and expansion. The results indicate that the applied and critical load models do not lead to any problems with other stresses. Further work includes writing a report on this study.

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Steven Izzo March 6, 2008 Structures Final Stress Considerations

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  1. Steven Izzo March 6, 2008 Structures Final Stress Considerations AAE 450 Spring 2008

  2. Research stress sources Modify numbers in code Check for failure/sizing change Method Results • Thrust vectoring- bending- ok for all angles • Engine misalignment- torsion and bending- ok for worst case • Spin stabilization- torsion and bending- ok unless very fast spin-up • Thermal effects- • Material property variance- ok unless extreme temperature range • Expansion- ok from use of joining like materials AAE 450 Spring 2008 Structures

  3. More Results • Acoustics- vibration- ok due to solid prop and balloon • Local stresses reserved for a future design • Conclusion- large applied and critical load models lead to no problems with other stresses Future Work • Write Report AAE 450 Spring 2008 Structures

  4. Class Sources • Steven Hiu and all contributors to the function tanksv2.m • Shurn, Stephan. “Thrust Vector Control.” February 28, 2008. • Stuart, Jeff. “Spin Stabilization of Third Stage(200kg Payload).” February 28, 2008. • Waite, Adam. “Analyzing Loading Based on Test Design.” February 21, 2008. • Wilcox, Nicole. “Thrust Offset Angle- Hybrid and Solid.” February 28, 2008.

  5. Outside Sources • Boddy, J, Mitchell, J, & Harris, L. “Systems Evaluation of Advanced Structures and Materials in Future Launch Vehicles.” AIAA Journal no. 1103-391, 1967. • Klemans, B. “The Vanguard Satellite Launching Vehicle” The Martin Company, Engineering Report No. 11022, April 1960. • Pisacane, V & Moore, R. Fundamentals of Space Systems. Oxford Press, New York, NY 1994. • Sarafin, T. Spacecraft Structures and Mechanisms: From Concept to Launch. Microcosm, Inc. Torrance, CA 1995. • Sun, C.T. Mechanics of Aircraft Structures. John Wiley & Sons, New York, NY 2006.

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