The objective of this investigation was to develop an innovative methodology for life and reliability prediction of hot-section components in advanced turbopropulsion systems. A set of three generic time-dependent crack growth models was implemented and integrated into the Darwin® probabilistic life-prediction code. Using the enhanced risk analysis tool and material constants calibrated to IN 718 data, the effect of time-dependent crack growth on the risk of fracture in a turboengine component was demonstrated for a generic rotor design and a realistic mission profile. The results of this investigation confirmed that time-dependent crack growth and cycle-dependent crack growth in IN 718 can be treated by a simple summation of the crack increments over a mission. For the temperatures considered, time-dependent crack growth in IN 718 can be considered as a K-controlled environmentally-induced degradation process. Software implementation of the generic time-dependent crack growth models in Darwin provides a pathway for potential evaluation of the effects of multiple damage modes on the risk of component fracture at high service temperatures.
Life Prediction for Turbopropulsion Systems Under Dwell Fatigue Conditions
Contributed by the International Gas Turbine Institute (IGTI) of ASME for publication in the JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received June 15, 2012; final manuscript received June 27, 2012; published online October 11, 2012. Editor: Dilip R. Ballal.
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Chan, K. S., Enright, M. P., Moody, J. P., Hocking, B., and Fitch, S. H. K. (October 11, 2012). "Life Prediction for Turbopropulsion Systems Under Dwell Fatigue Conditions." ASME. J. Eng. Gas Turbines Power. December 2012; 134(12): 122501. https://doi.org/10.1115/1.4007321
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