き裂成長解析に基づくガスタービン静翼の余寿命評価

概要

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A crack growth analysis method for gas turbine first-stage nozzle was discussed in order to improve the residual life assessment method of the nozzle. A cobalt base superalloy was used for the trap-ezoidal strain waveform including the compressive strain hold. Crack growth rate was accelerated with increase of the compressive hold period. A crack growth analysis was carried out considering the stress profile in the nozzle which has a gradient due to the hot combustion gas and inner cooling. Crack growth rate calculated in this analysis was modified with considering the compressive strain hold effect. The predicted crack growth was coincided with the inspection data within factor of 1.5. Furthermore, a simplified method to predict the crack length after service operation was also proposed and it was verified by using the inspection data.
一般社団法人日本機械学会の論文
2000-02-25