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External Airframe Loads Development for Full-Scale Helicopter Fatigue Test Application

Jeffery Brenna, Dr. Robert McGinty, Mercer Engineering Research Center

https://doi.org/10.4050/F-0079-2023-18159

Abstract:
This paper presents the development and evaluation of helicopter airframe loads for application to a full-scale fatigue test demonstration. The loads development method utilizes flight strain survey data and an airframe-representative finite element model to relate structural loading to strains. A previously developed approach has been modified to meet the requirements to simulate structural loading from flight conditions on a fixed load frame. A comparative stress-life fatigue analysis using measured flight data and predicted spectra to quantify fatigue prediction accuracy is also presented. A theoretical evaluation found a 10% error in strain prediction could result in up to 74% error in fatigue damage prediction. The practical evaluation using the predicted stress spectra found a wide spread of prediction accuracy. 77% of all predictions are under-predicted, typically in regions of low measured strain. The best predictions, in regions of highest measured strains, were within measurements by a factor of 1.5. These predictions exceed expectations, well within an acceptable level of error, however universal correlation in fatigue prediction is desired.


External Airframe Loads Development for Full-Scale Helicopter Fatigue Test Application

  • Presented at Forum 79
  • 13 pages
  • SKU # : F-0079-2023-18159
  • Structures and Materials

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External Airframe Loads Development for Full-Scale Helicopter Fatigue Test Application

Authors / Details:
Jeffery Brenna, Dr. Robert McGinty, Mercer Engineering Research Center