Study of short term creep in fast air flows, allowing for the variable loads arising from vibrations

Abstract

1. An increase in the air-flow velocity from M=0.94 to M=1.6 for the OT4 alloy at 500°C and from M=0.7 to M=1.6 for the VZh98 alloy at 1000°C accelerates creep and shortens the total time-to-failure as a result of an intensification of the corrosion-erosion action of the flow. The degree of deformation at the point of failure diminishes by a factor of 2 to 2.5 as compared with tests in still air. 2. An increase in the angle of attack at a constant air-flow velocity (M=0.94) for these alloys accelerates the creep rate as a result of an increase in the average statistical value of the dynamic stress component.