Helicopter rotor blade stress calculations

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SUMMARY

The discussion focuses on performing stress calculations for helicopter rotor blades as part of a master's project. The user, Marty, seeks guidance on modeling techniques and formulas for stress analysis, considering both Finite Element Analysis (FEA) software and hand calculations. Key resources mentioned include Chapter 9 of "Helicopter Theory" by Johnson, which addresses rotor blade dynamics and loads. Additionally, the complexities of stress calculations for laminated composites are highlighted, necessitating an understanding of lamination theory.

PREREQUISITES
  • Understanding of Finite Element Analysis (FEA) software
  • Familiarity with linear stress analysis principles
  • Knowledge of rotor dynamics as outlined in "Helicopter Theory" by Johnson
  • Basic concepts of lamination theory for composite materials
NEXT STEPS
  • Study the dynamics of rotor blades in "Helicopter Theory" by Johnson
  • Research hand calculation methods for stress analysis in cantilever beams
  • Explore advanced techniques in laminated composite stress analysis
  • Learn about superposition principles in linear stress analysis
USEFUL FOR

Students in aerospace engineering, mechanical engineers involved in rotorcraft design, and professionals conducting stress analysis on composite materials will benefit from this discussion.

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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