The methods used to calculate the safe fatigue life of helicopter components are described. Flight loads are determined for the flight conditions and maneuvers of the mission profiles. The application of the Palmgren-Miner rule and mean load reduction techniques is described. Reduced S-N curve methods in which constant amplitude tests are carried out at various load levels until failure are presented together with the corresponding error analysis. Alternative statistical analyses are compared. Many different ways are available to calculate safe fatigue lives, but there is general agreement on the results obtained. An expression is derived for the reduction factor for the S-N curves.
State of the Art and Statistical Aspects of Helicopter Fatigue Substantiation Procedures
1980
24 pages
Report
No indication
English
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