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The possibilities of predicting thermal fatigue durability for single crystal on the
base of coupled thermo-electro-mechanical finite-element modeling with using of
deformational criterion and microstructural models of inelastic deformation are investigated.
Results of thermal and stress-strain state simulations of single-crystal corset specimens under
cyclic electric heating and cooling are presented and discussed. Comparison of computational
results with experimental data for various single-crystal nickel-based superalloys
demonstrates a good accuracy in the prediction of the number of cycles for the macrocrack
initiation. The influence of maximum / minimum values of temperature in cycle and delay
duration on the number of cycles for the macrocrack initiation are analyzed. The simplified
analytic approximation for thermal fatigue durability curves is proposed.
Keywords: : thermal fatigue, single-crystal nickel based superalloy, deformation criterion, corset sample, thermo-electric problem, finite element modeling |
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