Helicopter rotor blade stress calculations

AI Thread Summary
The discussion focuses on performing stress analysis for helicopter rotor blades as part of a master's project. The user is seeking guidance on appropriate formulas and modeling techniques, considering the limitations of a simple cantilever model due to the blades' rotation. A suggestion is made to use superposition for linear analysis, and a reference to Chapter 9 of Johnson's "Helicopter Theory" is provided for further insights on rotor blade dynamics and loads. Additionally, the complexities of stress calculations for laminated composites are mentioned, highlighting the need for knowledge of lamination theory. The conversation emphasizes the importance of accurate modeling and theoretical understanding in rotor blade stress analysis.
Aero_Marty
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Heyhey,

I am currently doing my final year masters project which involves testing rotor blades. I am performing a stress analysis of the blades. I will be using FEA software, but I also need to do some hand calculations. I have been looking for formulas for a while now, but I am unsure which to use and how exactly I should model it.

I was thinking I could model it as a simple cantilever, but obviously this wouldn't account for the rotation. Could anyone please help me? It would be much appreciated.

Regards


Marty
 
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If you make the assumption that you are staying in the linear realm, you can use superposition.

EDIT: WOO HOO! Number 5000!
 
Chapter 9 of Johnson's book "Helicopter Theory" covers the dynamics of rotor blades and the dynamic loads that exist in a rotor blade. Stress calculations get more complicated if you're using a laminated composite, in which case you may need to read up on lamination theory.
 
Thanks for your help, I'll have a look into that
 

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