A method has been created to compute elastic-plastic strain cycle by cycle to develop a stress spectrum under multiaxial spectrum loading and to predict fatigue test failures using multiaxial fatigue failure theories. Load to strain/stress transfer functions of centrifugal force, bending deflection, and torsional twist loads acting on the tie bar were also developed. A nonlinear finite element model was developed to verify the load to stress transfer function and to determine effective notch factors. The notch strain history was cycle counted with the peak-valley method to identify fatigue cycles. Using this information, the 11 stress spectrums corresponding to the 11 fatigue tests were created. The multiaxial fatigue failure strain theories (maximum principal, von Mises, shear, Lohr's, Kendil) were used to predict fatigue failure life. The life using the maximum principal strain correlated well with test life. Further service load spectrum was developed to compute service life. Predictions using different theories provide upper and lower bounds of fatigue life.
H-46 tie bar fatigue failure predictions by multiaxial fatigue theory
Ermüdungsbruchvorhersage für H-46 Zugstäbe mittels mehraxialer Ermüdungstheorie
Journal of the American Helicopter Society ; 54 , 4 ; 042006/1-042006/17
2009
17 Seiten, 41 Bilder, 1 Tabelle, 7 Quellen
Article (Journal)
English
H-46 Tie Bar Fatigue Failure Predictions by Multiaxial Fatigue Theory
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