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Titanium Fan Disc Structural Life Prediction/Correlation Program
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English
Abstract
A Structural Life Prediction/Correlation (SLP/C) program developed advanced methods of analyzing cumulative fatigue damage to more accurately predict the LCF life of a fan disk for correlation to the experimentally determined life for an accelerated duty cycle. The critical location (bolt holes) of the fan disk was determined using detailed elastic finite element analyses. Special “calibrated models” of the bolt holes were designed and tested to determine the fatigue notch factor. A materials program characterized a specific heat of disk material (Ti-6Al-4V) used in the program. The fan disk life was predicted based on materials, calibrated model and fan rotor test data for an accelerated cycle developed from a representative trainer mission. Two fan rotors were subjected to the accelerated duty cycle until crack initiation was detected, using eddy current techniques. Additional testing was conducted to determine the initial stages of crack propagation. Results indicate excellent correlation between predicted and experimental crack initiation lives, whereas crack growth lives were overpredicted.
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Citation
Walcher, J. and Finnerty, D., "Titanium Fan Disc Structural Life Prediction/Correlation Program," SAE Technical Paper 821437, 1982, https://doi.org/10.4271/821437.Also In
References
- Manson S.S. “Thermal Stress and Low Cycle Fatigue,” McGraw Hill 1966
- Walcher J. Gray D. Hanson S.S. “Aspects of Cumulative Fatigue Damage Analysis of Cold End Rotating Structures,” AIAA/SAE/ASME 15th Joint Propulsion Conference 1979
- Engle R.M. Rudd J.L. “Spectrum Crack Growth Analysis Using the Willenborg Model,” Journal of Aircraft, 13 7 1976 462 466
- Manson S. S. Halford G. R. “Practical Implementation of the Double Linear Damage Rule and Damage Curve Approach For Treating Cumulatie Fatigue Damage Int. Journal of Fracture, 17 2 1981 169 192
- Smith K.N. Watson P. Topper T.H. “A Stress-Strain Function for the Fatigue of Metals,” Journal of Materials, JML5A, 5 4 1970 767 778
- Wetzell R.M. “A Method of Fatigue Damage Analysis,” PhD. Thesis, University of Waterloo, Canada, 1971 Scientific Research Staff Report SR71-107
- Masing G. “Eignespannungen and Verfestigung Bein Messing,” Proc. Second Int'l. Cong, of Applied Mech., Zurich 1926 332 325
- Socie D.F. “Fatigue Life Prediction Using Local Stress-Strain Concepts,” Experimental Mechanics 1977 50 56
- AFWAL-TR-822027, “ Structural Life Prediction/Correlation Program,” by Teledyne CAE, Toledo, Ohio 1982
- “Stress and Subcritical Crack Growth Analysis Under Contained Plastic Conditions.” Prepared for Electric Power Research Institute by Failure Analysis Associates Palo Alto California