Helicopter rotor blade stress calculations

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Discussion Overview

The discussion centers around the stress analysis of helicopter rotor blades, specifically focusing on the methodologies for calculating stress, including the use of finite element analysis (FEA) software and hand calculations. The scope includes theoretical considerations and practical modeling approaches.

Discussion Character

  • Exploratory
  • Technical explanation
  • Homework-related

Main Points Raised

  • One participant, Marty, seeks assistance with stress analysis for rotor blades, expressing uncertainty about the appropriate formulas and modeling techniques.
  • Another participant suggests using the principle of superposition under the assumption of linear behavior.
  • A third participant references Chapter 9 of Johnson's "Helicopter Theory," noting that stress calculations become more complex when dealing with laminated composites and recommending a review of lamination theory.

Areas of Agreement / Disagreement

Participants have not reached a consensus, as there are multiple approaches and considerations presented regarding the modeling and analysis of rotor blade stress.

Contextual Notes

Limitations include the assumption of linearity and the complexities introduced by different materials, such as laminated composites, which may affect the choice of modeling techniques.

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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