PART RELIABILITY DESIGN OF AIR-COOLED TURBINE BLADE UNDER THERMAL STRESS-DEPENDENT STRENGTH USING POLYNOMIAL METHOD

摘要

In this paper, Lagrange factor polynomial method is developed to generate the stress-strength interference model with thermal stress-dependent strength. Accuracy of this method is investigated by an aeroengine air-cooled turbine blade. The computed reliability is quite high under several thermal stress modes. Then probability mean function estimated by this method has relatively low errors over most subintervals of the thermal stress dependent strength distribution. With this approach conditional thermal stress-dependent strength reliability of aeroengine structural systems can be established conveniently. Meanwhile the application range of the classical stress-strength interference model can be extended.